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  25.   <div class="document" id="documentId">
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    27. 

  27.       <h1 class="title">std/bitops</h1>
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  33.         <option value="auto">🌗 Match OS</option>
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  35.         <option value="light">🌕 Light</option>
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  37.     </div>
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  38.     <div id="global-links">
    39. 

  39.       <ul class="simple-boot">
    40. 

  40.         <li><a href="manual.html">Manual</a></li>
    41. 

  41.         <li><a href="lib.html">Standard library</a></li>
    42. 

  42.         <li> <a id="indexLink" href="theindex.html">Index</a></li>
    43. 

  43.         <li><a href="compiler/theindex.html">Compiler docs</a></li>
    44. 

  44.         <li><a href="https://nim-lang.github.io/fusion/theindex.html">Fusion docs</a></li>
    45. 

  45.         <li><a href="https://nim-lang.github.io/Nim/">devel</a>, <a href="https://nim-lang.org/documentation.html">stable</a></li>
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  49.       Search: <input type="search" id="searchInput"
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  50.         oninput="search()" />
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  51.     </div>
    52. 

  52.     
    53. 

  53.     <ul class="simple simple-toc" id="toc-list">
    54. 

  54.   <li>
    55. 

  55.   <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
    56. 

  56. </li>
    57. 

  57. <li>
    58. 

  58.   <details open>
    59. 

  59.     <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
    60. 

  60.     <ul class="simple simple-toc-section">
    61. 

  61.       <li><a class="reference" href="#BitsRange" title="BitsRange[T] = range[0 .. sizeof(T) * 8 - 1]">BitsRange</a></li>
    62. 

  62. 

  63.     </ul>
    64. 

  64.   </details>
    65. 

  65. </li>
    66. 

  66. <li>
    67. 

  67.   <details open>
    68. 

  68.     <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
    69. 

  69.     <ul class="simple simple-toc-section">
    70. 

  70.       <ul class="simple nested-toc-section">bitnot
    71. 

  71.   <li><a class="reference" href="#bitnot%2CT" title="bitnot[T: SomeInteger](x: T): T">bitnot[T: SomeInteger](x: T): T</a></li>
    72. 

  72. 

  73. </ul>
    74. 

  74. <ul class="simple nested-toc-section">bitslice
    75. 

  75.   <li><a class="reference" href="#bitslice%2CT%2CSlice%5Bint%5D" title="bitslice[T: SomeInteger](v: var T; slice: Slice[int])">bitslice[T: SomeInteger](v: var T; slice: Slice[int])</a></li>
    76. 

  76. 

  77. </ul>
    78. 

  78. <ul class="simple nested-toc-section">bitsliced
    79. 

  79.   <li><a class="reference" href="#bitsliced%2CT%2CSlice%5Bint%5D" title="bitsliced[T: SomeInteger](v: T; slice: Slice[int]): T">bitsliced[T: SomeInteger](v: T; slice: Slice[int]): T</a></li>
    80. 

  80. 

  81. </ul>
    82. 

  82. <ul class="simple nested-toc-section">clearBit
    83. 

  83.   <li><a class="reference" href="#clearBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D" title="clearBit[T: SomeInteger](v: var T; bit: BitsRange[T])">clearBit[T: SomeInteger](v: var T; bit: BitsRange[T])</a></li>
    84. 

  84. 

  85. </ul>
    86. 

  86. <ul class="simple nested-toc-section">clearMask
    87. 

  87.   <li><a class="reference" href="#clearMask%2CT%2CT" title="clearMask[T: SomeInteger](v: var T; mask: T)">clearMask[T: SomeInteger](v: var T; mask: T)</a></li>
    88. 

  88. <li><a class="reference" href="#clearMask%2CT%2CSlice%5Bint%5D" title="clearMask[T: SomeInteger](v: var T; slice: Slice[int])">clearMask[T: SomeInteger](v: var T; slice: Slice[int])</a></li>
    89. 

  89. 

  90. </ul>
    91. 

  91. <ul class="simple nested-toc-section">clearMasked
    92. 

  92.   <li><a class="reference" href="#clearMasked%2CT%2CT" title="clearMasked[T: SomeInteger](v, mask: T): T">clearMasked[T: SomeInteger](v, mask: T): T</a></li>
    93. 

  93. <li><a class="reference" href="#clearMasked%2CT%2CSlice%5Bint%5D" title="clearMasked[T: SomeInteger](v: T; slice: Slice[int]): T">clearMasked[T: SomeInteger](v: T; slice: Slice[int]): T</a></li>
    94. 

  94. 

  95. </ul>
    96. 

  96. <ul class="simple nested-toc-section">countLeadingZeroBits
    97. 

  97.   <li><a class="reference" href="#countLeadingZeroBits%2CSomeInteger" title="countLeadingZeroBits(x: SomeInteger): int">countLeadingZeroBits(x: SomeInteger): int</a></li>
    98. 

  98. 

  99. </ul>
    100. 

  100. <ul class="simple nested-toc-section">countSetBits
    101. 

  101.   <li><a class="reference" href="#countSetBits%2CSomeInteger" title="countSetBits(x: SomeInteger): int">countSetBits(x: SomeInteger): int</a></li>
    102. 

  102. 

  103. </ul>
    104. 

  104. <ul class="simple nested-toc-section">countTrailingZeroBits
    105. 

  105.   <li><a class="reference" href="#countTrailingZeroBits%2CSomeInteger" title="countTrailingZeroBits(x: SomeInteger): int">countTrailingZeroBits(x: SomeInteger): int</a></li>
    106. 

  106. 

  107. </ul>
    108. 

  108. <ul class="simple nested-toc-section">fastLog2
    109. 

  109.   <li><a class="reference" href="#fastLog2%2CSomeInteger" title="fastLog2(x: SomeInteger): int">fastLog2(x: SomeInteger): int</a></li>
    110. 

  110. 

  111. </ul>
    112. 

  112. <ul class="simple nested-toc-section">firstSetBit
    113. 

  113.   <li><a class="reference" href="#firstSetBit%2CSomeInteger" title="firstSetBit(x: SomeInteger): int">firstSetBit(x: SomeInteger): int</a></li>
    114. 

  114. 

  115. </ul>
    116. 

  116. <ul class="simple nested-toc-section">flipBit
    117. 

  117.   <li><a class="reference" href="#flipBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D" title="flipBit[T: SomeInteger](v: var T; bit: BitsRange[T])">flipBit[T: SomeInteger](v: var T; bit: BitsRange[T])</a></li>
    118. 

  118. 

  119. </ul>
    120. 

  120. <ul class="simple nested-toc-section">flipMask
    121. 

  121.   <li><a class="reference" href="#flipMask%2CT%2CT" title="flipMask[T: SomeInteger](v: var T; mask: T)">flipMask[T: SomeInteger](v: var T; mask: T)</a></li>
    122. 

  122. <li><a class="reference" href="#flipMask%2CT%2CSlice%5Bint%5D" title="flipMask[T: SomeInteger](v: var T; slice: Slice[int])">flipMask[T: SomeInteger](v: var T; slice: Slice[int])</a></li>
    123. 

  123. 

  124. </ul>
    125. 

  125. <ul class="simple nested-toc-section">flipMasked
    126. 

  126.   <li><a class="reference" href="#flipMasked%2CT%2CT" title="flipMasked[T: SomeInteger](v, mask: T): T">flipMasked[T: SomeInteger](v, mask: T): T</a></li>
    127. 

  127. <li><a class="reference" href="#flipMasked%2CT%2CSlice%5Bint%5D" title="flipMasked[T: SomeInteger](v: T; slice: Slice[int]): T">flipMasked[T: SomeInteger](v: T; slice: Slice[int]): T</a></li>
    128. 

  128. 

  129. </ul>
    130. 

  130. <ul class="simple nested-toc-section">mask
    131. 

  131.   <li><a class="reference" href="#mask%2CT%2CT" title="mask[T: SomeInteger](v: var T; mask: T)">mask[T: SomeInteger](v: var T; mask: T)</a></li>
    132. 

  132. <li><a class="reference" href="#mask%2CT%2CSlice%5Bint%5D" title="mask[T: SomeInteger](v: var T; slice: Slice[int])">mask[T: SomeInteger](v: var T; slice: Slice[int])</a></li>
    133. 

  133. 

  134. </ul>
    135. 

  135. <ul class="simple nested-toc-section">masked
    136. 

  136.   <li><a class="reference" href="#masked%2CT%2CT" title="masked[T: SomeInteger](v, mask: T): T">masked[T: SomeInteger](v, mask: T): T</a></li>
    137. 

  137. <li><a class="reference" href="#masked%2CT%2CSlice%5Bint%5D" title="masked[T: SomeInteger](v: T; slice: Slice[int]): T">masked[T: SomeInteger](v: T; slice: Slice[int]): T</a></li>
    138. 

  138. 

  139. </ul>
    140. 

  140. <ul class="simple nested-toc-section">parityBits
    141. 

  141.   <li><a class="reference" href="#parityBits%2CSomeInteger" title="parityBits(x: SomeInteger): int">parityBits(x: SomeInteger): int</a></li>
    142. 

  142. 

  143. </ul>
    144. 

  144. <ul class="simple nested-toc-section">popcount
    145. 

  145.   <li><a class="reference" href="#popcount%2CSomeInteger" title="popcount(x: SomeInteger): int">popcount(x: SomeInteger): int</a></li>
    146. 

  146. 

  147. </ul>
    148. 

  148. <ul class="simple nested-toc-section">reverseBits
    149. 

  149.   <li><a class="reference" href="#reverseBits%2CT" title="reverseBits[T: SomeUnsignedInt](x: T): T">reverseBits[T: SomeUnsignedInt](x: T): T</a></li>
    150. 

  150. 

  151. </ul>
    152. 

  152. <ul class="simple nested-toc-section">rotateLeftBits
    153. 

  153.   <li><a class="reference" href="#rotateLeftBits%2CT%2Crange%5B%5D" title="rotateLeftBits[T: SomeUnsignedInt](value: T; shift: range[0 .. (sizeof(T) * 8)]): T">rotateLeftBits[T: SomeUnsignedInt](value: T; shift: range[0 .. (sizeof(T) * 8)]): T</a></li>
    154. 

  154. 

  155. </ul>
    156. 

  156. <ul class="simple nested-toc-section">rotateRightBits
    157. 

  157.   <li><a class="reference" href="#rotateRightBits%2CT%2Crange%5B%5D" title="rotateRightBits[T: SomeUnsignedInt](value: T; shift: range[0 .. (sizeof(T) * 8)]): T">rotateRightBits[T: SomeUnsignedInt](value: T; shift: range[0 .. (sizeof(T) * 8)]): T</a></li>
    158. 

  158. 

  159. </ul>
    160. 

  160. <ul class="simple nested-toc-section">setBit
    161. 

  161.   <li><a class="reference" href="#setBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D" title="setBit[T: SomeInteger](v: var T; bit: BitsRange[T])">setBit[T: SomeInteger](v: var T; bit: BitsRange[T])</a></li>
    162. 

  162. 

  163. </ul>
    164. 

  164. <ul class="simple nested-toc-section">setMask
    165. 

  165.   <li><a class="reference" href="#setMask%2CT%2CT" title="setMask[T: SomeInteger](v: var T; mask: T)">setMask[T: SomeInteger](v: var T; mask: T)</a></li>
    166. 

  166. <li><a class="reference" href="#setMask%2CT%2CSlice%5Bint%5D" title="setMask[T: SomeInteger](v: var T; slice: Slice[int])">setMask[T: SomeInteger](v: var T; slice: Slice[int])</a></li>
    167. 

  167. 

  168. </ul>
    169. 

  169. <ul class="simple nested-toc-section">setMasked
    170. 

  170.   <li><a class="reference" href="#setMasked%2CT%2CT" title="setMasked[T: SomeInteger](v, mask: T): T">setMasked[T: SomeInteger](v, mask: T): T</a></li>
    171. 

  171. <li><a class="reference" href="#setMasked%2CT%2CSlice%5Bint%5D" title="setMasked[T: SomeInteger](v: T; slice: Slice[int]): T">setMasked[T: SomeInteger](v: T; slice: Slice[int]): T</a></li>
    172. 

  172. 

  173. </ul>
    174. 

  174. <ul class="simple nested-toc-section">testBit
    175. 

  175.   <li><a class="reference" href="#testBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D" title="testBit[T: SomeInteger](v: T; bit: BitsRange[T]): bool">testBit[T: SomeInteger](v: T; bit: BitsRange[T]): bool</a></li>
    176. 

  176. 

  177. </ul>
    178. 

  178. <ul class="simple nested-toc-section">toMask
    179. 

  179.   <li><a class="reference" href="#toMask%2CSlice%5Bint%5D" title="toMask[T: SomeInteger](slice: Slice[int]): T">toMask[T: SomeInteger](slice: Slice[int]): T</a></li>
    180. 

  180. 

  181. </ul>
    182. 

  182. 

  183.     </ul>
    184. 

  184.   </details>
    185. 

  185. </li>
    186. 

  186. <li>
    187. 

  187.   <details open>
    188. 

  188.     <summary><a class="reference reference-toplevel" href="#17" id="67">Macros</a></summary>
    189. 

  189.     <ul class="simple simple-toc-section">
    190. 

  190.       <ul class="simple nested-toc-section">bitand
    191. 

  191.   <li><a class="reference" href="#bitand.m%2CT%2CT%2Cvarargs%5BT%5D" title="bitand[T: SomeInteger](x, y: T; z: varargs[T]): T">bitand[T: SomeInteger](x, y: T; z: varargs[T]): T</a></li>
    192. 

  192. 

  193. </ul>
    194. 

  194. <ul class="simple nested-toc-section">bitor
    195. 

  195.   <li><a class="reference" href="#bitor.m%2CT%2CT%2Cvarargs%5BT%5D" title="bitor[T: SomeInteger](x, y: T; z: varargs[T]): T">bitor[T: SomeInteger](x, y: T; z: varargs[T]): T</a></li>
    196. 

  196. 

  197. </ul>
    198. 

  198. <ul class="simple nested-toc-section">bitxor
    199. 

  199.   <li><a class="reference" href="#bitxor.m%2CT%2CT%2Cvarargs%5BT%5D" title="bitxor[T: SomeInteger](x, y: T; z: varargs[T]): T">bitxor[T: SomeInteger](x, y: T; z: varargs[T]): T</a></li>
    200. 

  200. 

  201. </ul>
    202. 

  202. <ul class="simple nested-toc-section">clearBits
    203. 

  203.   <li><a class="reference" href="#clearBits.m%2Ctyped%2Cvarargs%5Btyped%5D" title="clearBits(v: typed; bits: varargs[typed]): untyped">clearBits(v: typed; bits: varargs[typed]): untyped</a></li>
    204. 

  204. 

  205. </ul>
    206. 

  206. <ul class="simple nested-toc-section">flipBits
    207. 

  207.   <li><a class="reference" href="#flipBits.m%2Ctyped%2Cvarargs%5Btyped%5D" title="flipBits(v: typed; bits: varargs[typed]): untyped">flipBits(v: typed; bits: varargs[typed]): untyped</a></li>
    208. 

  208. 

  209. </ul>
    210. 

  210. <ul class="simple nested-toc-section">setBits
    211. 

  211.   <li><a class="reference" href="#setBits.m%2Ctyped%2Cvarargs%5Btyped%5D" title="setBits(v: typed; bits: varargs[typed]): untyped">setBits(v: typed; bits: varargs[typed]): untyped</a></li>
    212. 

  212. 

  213. </ul>
    214. 

  214. 

  215.     </ul>
    216. 

  216.   </details>
    217. 

  217. </li>
    218. 

  218. 

  219. </ul>
    220. 

  220. 

  221.   </div>
    222. 

  222.   <div class="nine columns" id="content">
    223. 

  223.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    224. 

  224. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    225. 

  225. 

  226.     <div id="tocRoot"></div>
    227. 

  227.     
    228. 

  228.     <p class="module-desc"><p>This module implements a series of low level methods for bit manipulation.</p>
    229. 

  229. <p>By default, compiler intrinsics are used where possible to improve performance on supported compilers: <tt class="docutils literal"><span class="pre"><span class="Identifier">GCC</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">LLVM_GCC</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">CLANG</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">VCC</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">ICC</span></span></tt>.</p>
    230. 

  230. <p>The module will fallback to pure nim procs in case the backend is not supported. You can also use the flag <tt class="docutils literal"><span class="pre"><span class="Identifier">noIntrinsicsBitOpts</span></span></tt> to disable compiler intrinsics.</p>
    231. 

  231. <p>This module is also compatible with other backends: <tt class="docutils literal"><span class="pre"><span class="Identifier">JavaScript</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">NimScript</span></span></tt> as well as the <tt class="docutils literal"><span class="pre"><span class="Identifier">compiletime</span> <span class="Identifier">VM</span></span></tt>.</p>
    232. 

  232. <p>As a result of using optimized functions/intrinsics, some functions can return undefined results if the input is invalid. You can use the flag <tt class="docutils literal"><span class="pre"><span class="Identifier">noUndefinedBitOpts</span></span></tt> to force predictable behaviour for all input, causing a small performance hit.</p>
    233. 

  233. <p>At this time only <tt class="docutils literal"><span class="pre"><span class="Identifier">fastLog2</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">firstSetBit</span></span></tt>, <tt class="docutils literal"><span class="pre"><span class="Identifier">countLeadingZeroBits</span></span></tt> and <tt class="docutils literal"><span class="pre"><span class="Identifier">countTrailingZeroBits</span></span></tt> may return undefined and/or platform dependent values if given invalid input.</p>
    234. 

  234. </p>
    235. 

  235.     <div class="section" id="6">
    236. 

  236.   <h1><a class="toc-backref" href="#6">Imports</a></h1>
    237. 

  237.   <dl class="item">
    238. 

  238.     <a class="reference external" href="macros.html">macros</a>, <a class="reference external" href="since.html">since</a>, <a class="reference external" href="bitops_utils.html">bitops_utils</a>, <a class="reference external" href="countbits_impl.html">countbits_impl</a>
    239. 

  239.   </dl>
    240. 

  240. </div>
    241. 

  241. <div class="section" id="7">
    242. 

  242.   <h1><a class="toc-backref" href="#7">Types</a></h1>
    243. 

  243.   <dl class="item">
    244. 

  244.     <div id="BitsRange">
    245. 

  245.   <dt><pre><a href="bitops.html#BitsRange"><span class="Identifier">BitsRange</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span> <span class="Other">=</span> <a href="system.html#range"><span class="Identifier">range</span></a><span class="Other">[</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="Identifier">sizeof</span><span class="Other">(</span><span class="Identifier">T</span><span class="Other">)</span> <span class="Operator">*</span> <span class="DecNumber">8</span> <span class="Operator">-</span> <span class="DecNumber">1</span><span class="Other">]</span></pre></dt>
    246. 

  246.   <dd>
    247. 

  247.     
    248. 

  248.     A range with all bit positions for type <tt class="docutils literal"><span class="pre"><span class="Identifier">T</span></span></tt>.
    249. 

  249.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L63" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    250. 

  250. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L63" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    251. 

  251. 

  252.   </dd>
    253. 

  253. </div>
    254. 

  254. 

  255.   </dl>
    256. 

  256. </div>
    257. 

  257. <div class="section" id="12">
    258. 

  258.   <h1><a class="toc-backref" href="#12">Procs</a></h1>
    259. 

  259.   <dl class="item">
    260. 

  260.     <div id="bitnot-procs-all">
    261. 

  261.   <div id="bitnot,T">
    262. 

  262.   <dt><pre><span class="Keyword">func</span> <a href="#bitnot%2CT"><span class="Identifier">bitnot</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">magic</span><span class="Other">:</span> <span class="StringLit">&quot;BitnotI&quot;</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    263. 

  263.                                        <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
    264. 

  264.   <dd>
    265. 

  265.     
    266. 

  266.     Computes the <tt class="docutils literal"><span class="pre"><span class="Identifier">bitwise</span> <span class="Identifier">complement</span></span></tt> of the integer <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt>.
    267. 

  267.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L32" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    268. 

  268. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L32" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    269. 

  269. 

  270.   </dd>
    271. 

  271. </div>
    272. 

  272. 

  273. </div>
    274. 

  274. <div id="bitslice-procs-all">
    275. 

  275.   <div id="bitslice,T,Slice[int]">
    276. 

  276.   <dt><pre><span class="Keyword">proc</span> <a href="#bitslice%2CT%2CSlice%5Bint%5D"><span class="Identifier">bitslice</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    277. 

  277.   <dd>
    278. 

  278.     
    279. 

  279.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> into an extracted (and shifted) slice of bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>.
    280. 

  280. <p><strong class="examples_text">Example:</strong></p>
    281. 

  281. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">x</span> <span class="Operator">=</span> <span class="BinNumber">0b101110</span>
    282. 

  282. <span class="Identifier">x</span><span class="Operator">.</span><span class="Identifier">bitslice</span><span class="Punctuation">(</span><span class="DecNumber">2</span> <span class="Operator">..</span> <span class="DecNumber">4</span><span class="Punctuation">)</span>
    283. 

  283. <span class="Identifier">doAssert</span> <span class="Identifier">x</span> <span class="Operator">==</span> <span class="BinNumber">0b011</span></pre>
    284. 

  284.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L84" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    285. 

  285. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L84" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    286. 

  286. 

  287.   </dd>
    288. 

  288. </div>
    289. 

  289. 

  290. </div>
    291. 

  291. <div id="bitsliced-procs-all">
    292. 

  292.   <div id="bitsliced,T,Slice[int]">
    293. 

  293.   <dt><pre><span class="Keyword">func</span> <a href="#bitsliced%2CT%2CSlice%5Bint%5D"><span class="Identifier">bitsliced</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    294. 

  294.   <dd>
    295. 

  295.     
    296. 

  296.     Returns an extracted (and shifted) slice of bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>.
    297. 

  297. <p><strong class="examples_text">Example:</strong></p>
    298. 

  298. <pre class="listing"><span class="Identifier">doAssert</span> <span class="BinNumber">0b10111</span><span class="Operator">.</span><span class="Identifier">bitsliced</span><span class="Punctuation">(</span><span class="DecNumber">2</span> <span class="Operator">..</span> <span class="DecNumber">4</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b101</span>
    299. 

  299. <span class="Identifier">doAssert</span> <span class="BinNumber">0b11100</span><span class="Operator">.</span><span class="Identifier">bitsliced</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="DecNumber">2</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b100</span>
    300. 

  300. <span class="Identifier">doAssert</span> <span class="BinNumber">0b11100</span><span class="Operator">.</span><span class="Identifier">bitsliced</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..&lt;</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b100</span></pre>
    301. 

  301.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L72" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    302. 

  302. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L72" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    303. 

  303. 

  304.   </dd>
    305. 

  305. </div>
    306. 

  306. 

  307. </div>
    308. 

  308. <div id="clearBit-procs-all">
    309. 

  309.   <div id="clearBit,T,BitsRange[T: SomeInteger]">
    310. 

  310.   <dt><pre><span class="Keyword">proc</span> <a href="#clearBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D"><span class="Identifier">clearBit</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">bit</span><span class="Other">:</span> <a href="bitops.html#BitsRange"><span class="Identifier">BitsRange</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    311. 

  311.   <dd>
    312. 

  312.     
    313. 

  313.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bit at position <tt class="docutils literal"><span class="pre"><span class="Identifier">bit</span></span></tt> set to 0.
    314. 

  314. <p><strong class="examples_text">Example:</strong></p>
    315. 

  315. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    316. 

  316. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearBit</span><span class="Punctuation">(</span><span class="DecNumber">1'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    317. 

  317. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span></pre>
    318. 

  318.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L292" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    319. 

  319. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L292" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    320. 

  320. 

  321.   </dd>
    322. 

  322. </div>
    323. 

  323. 

  324. </div>
    325. 

  325. <div id="clearMask-procs-all">
    326. 

  326.   <div id="clearMask,T,T">
    327. 

  327.   <dt><pre><span class="Keyword">proc</span> <a href="#clearMask%2CT%2CT"><span class="Identifier">clearMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    328. 

  328.   <dd>
    329. 

  329.     
    330. 

  330.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> set to 0.</p>
    331. 

  331. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation with an <em>inverted mask</em>.</p>
    332. 

  332. 

  333. <p><strong class="examples_text">Example:</strong></p>
    334. 

  334. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    335. 

  335. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearMask</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    336. 

  336. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span></pre>
    337. 

  337.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L217" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    338. 

  338. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L217" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    339. 

  339. 

  340.   </dd>
    341. 

  341. </div>
    342. 

  342. <div id="clearMask,T,Slice[int]">
    343. 

  343.   <dt><pre><span class="Keyword">proc</span> <a href="#clearMask%2CT%2CSlice%5Bint%5D"><span class="Identifier">clearMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    344. 

  344.   <dd>
    345. 

  345.     
    346. 

  346.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> set to 0.</p>
    347. 

  347. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation with an <em>inverted mask</em>.</p>
    348. 

  348. 

  349. <p><strong class="examples_text">Example:</strong></p>
    350. 

  350. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    351. 

  351. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearMask</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span>
    352. 

  352. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span></pre>
    353. 

  353.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L229" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    354. 

  354. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L229" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    355. 

  355. 

  356.   </dd>
    357. 

  357. </div>
    358. 

  358. 

  359. </div>
    360. 

  360. <div id="clearMasked-procs-all">
    361. 

  361.   <div id="clearMasked,T,T">
    362. 

  362.   <dt><pre><span class="Keyword">func</span> <a href="#clearMasked%2CT%2CT"><span class="Identifier">clearMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">,</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    363. 

  363.   <dd>
    364. 

  364.     
    365. 

  365.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> set to 0.</p>
    366. 

  366. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation with an <em>inverted mask</em>.</p>
    367. 

  367. 

  368. <p><strong class="examples_text">Example:</strong></p>
    369. 

  369. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    370. 

  370. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearMasked</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span></pre>
    371. 

  371.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L195" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    372. 

  372. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L195" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    373. 

  373. 

  374.   </dd>
    375. 

  375. </div>
    376. 

  376. <div id="clearMasked,T,Slice[int]">
    377. 

  377.   <dt><pre><span class="Keyword">func</span> <a href="#clearMasked%2CT%2CSlice%5Bint%5D"><span class="Identifier">clearMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    378. 

  378.   <dd>
    379. 

  379.     
    380. 

  380.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> set to 0.</p>
    381. 

  381. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation with an <em>inverted mask</em>.</p>
    382. 

  382. 

  383. <p><strong class="examples_text">Example:</strong></p>
    384. 

  384. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    385. 

  385. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearMasked</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span></pre>
    386. 

  386.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L206" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    387. 

  387. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L206" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    388. 

  388. 

  389.   </dd>
    390. 

  390. </div>
    391. 

  391. 

  392. </div>
    393. 

  393. <div id="countLeadingZeroBits-procs-all">
    394. 

  394.   <div id="countLeadingZeroBits,SomeInteger">
    395. 

  395.   <dt><pre><span class="Keyword">func</span> <a href="#countLeadingZeroBits%2CSomeInteger"><span class="Identifier">countLeadingZeroBits</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    396. 

  396.   <dd>
    397. 

  397.     
    398. 

  398.     <p>Returns the number of leading zero bits in an integer. If <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> is zero, when <tt class="docutils literal"><span class="pre"><span class="Identifier">noUndefinedBitOpts</span></span></tt> is set, the result is 0, otherwise the result is undefined.</p>
    399. 

  399. <p><strong>See also:</strong></p>
    400. 

  400. <ul class="simple"><li><a class="reference external" href="#countTrailingZeroBits,SomeInteger">countTrailingZeroBits proc</a></li>
    401. 

  401. </ul>
    402. 

  402. 

  403. <p><strong class="examples_text">Example:</strong></p>
    404. 

  404. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">countLeadingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">7</span>
    405. 

  405. <span class="Identifier">doAssert</span> <span class="Identifier">countLeadingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">6</span>
    406. 

  406. <span class="Identifier">doAssert</span> <span class="Identifier">countLeadingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0100'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">5</span>
    407. 

  407. <span class="Identifier">doAssert</span> <span class="Identifier">countLeadingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1000'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">4</span>
    408. 

  408. <span class="Identifier">doAssert</span> <span class="Identifier">countLeadingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">4</span></pre>
    409. 

  409.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L604" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    410. 

  410. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L604" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    411. 

  411. 

  412.   </dd>
    413. 

  413. </div>
    414. 

  414. 

  415. </div>
    416. 

  416. <div id="countSetBits-procs-all">
    417. 

  417.   <div id="countSetBits,SomeInteger">
    418. 

  418.   <dt><pre><span class="Keyword">func</span> <a href="#countSetBits%2CSomeInteger"><span class="Identifier">countSetBits</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    419. 

  419.   <dd>
    420. 

  420.     
    421. 

  421.     Counts the set bits in an integer (also called <span id="hamming-weight_1">Hamming weight</span>).
    422. 

  422. <p><strong class="examples_text">Example:</strong></p>
    423. 

  423. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">countSetBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">2</span>
    424. 

  424. <span class="Identifier">doAssert</span> <span class="Identifier">countSetBits</span><span class="Punctuation">(</span><span class="BinNumber">0b1010_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">4</span></pre>
    425. 

  425.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L488" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    426. 

  426. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L488" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    427. 

  427. 

  428.   </dd>
    429. 

  429. </div>
    430. 

  430. 

  431. </div>
    432. 

  432. <div id="countTrailingZeroBits-procs-all">
    433. 

  433.   <div id="countTrailingZeroBits,SomeInteger">
    434. 

  434.   <dt><pre><span class="Keyword">func</span> <a href="#countTrailingZeroBits%2CSomeInteger"><span class="Identifier">countTrailingZeroBits</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    435. 

  435.   <dd>
    436. 

  436.     
    437. 

  437.     <p>Returns the number of trailing zeros in an integer. If <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> is zero, when <tt class="docutils literal"><span class="pre"><span class="Identifier">noUndefinedBitOpts</span></span></tt> is set, the result is 0, otherwise the result is undefined.</p>
    438. 

  438. <p><strong>See also:</strong></p>
    439. 

  439. <ul class="simple"><li><a class="reference external" href="#countLeadingZeroBits,SomeInteger">countLeadingZeroBits proc</a></li>
    440. 

  440. </ul>
    441. 

  441. 

  442. <p><strong class="examples_text">Example:</strong></p>
    443. 

  443. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">countTrailingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span>
    444. 

  444. <span class="Identifier">doAssert</span> <span class="Identifier">countTrailingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span>
    445. 

  445. <span class="Identifier">doAssert</span> <span class="Identifier">countTrailingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0100'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">2</span>
    446. 

  446. <span class="Identifier">doAssert</span> <span class="Identifier">countTrailingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1000'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span>
    447. 

  447. <span class="Identifier">doAssert</span> <span class="Identifier">countTrailingZeroBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span></pre>
    448. 

  448.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L632" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    449. 

  449. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L632" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    450. 

  450. 

  451.   </dd>
    452. 

  452. </div>
    453. 

  453. 

  454. </div>
    455. 

  455. <div id="fastLog2-procs-all">
    456. 

  456.   <div id="fastLog2,SomeInteger">
    457. 

  457.   <dt><pre><span class="Keyword">func</span> <a href="#fastLog2%2CSomeInteger"><span class="Identifier">fastLog2</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    458. 

  458.   <dd>
    459. 

  459.     
    460. 

  460.     Quickly find the log base 2 of an integer. If <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> is zero, when <tt class="docutils literal"><span class="pre"><span class="Identifier">noUndefinedBitOpts</span></span></tt> is set, the result is -1, otherwise the result is undefined.
    461. 

  461. <p><strong class="examples_text">Example:</strong></p>
    462. 

  462. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">fastLog2</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span>
    463. 

  463. <span class="Identifier">doAssert</span> <span class="Identifier">fastLog2</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span>
    464. 

  464. <span class="Identifier">doAssert</span> <span class="Identifier">fastLog2</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0100'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">2</span>
    465. 

  465. <span class="Identifier">doAssert</span> <span class="Identifier">fastLog2</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1000'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span>
    466. 

  466. <span class="Identifier">doAssert</span> <span class="Identifier">fastLog2</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span></pre>
    467. 

  467.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L565" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    468. 

  468. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L565" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    469. 

  469. 

  470.   </dd>
    471. 

  471. </div>
    472. 

  472. 

  473. </div>
    474. 

  474. <div id="firstSetBit-procs-all">
    475. 

  475.   <div id="firstSetBit,SomeInteger">
    476. 

  476.   <dt><pre><span class="Keyword">func</span> <a href="#firstSetBit%2CSomeInteger"><span class="Identifier">firstSetBit</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    477. 

  477.   <dd>
    478. 

  478.     
    479. 

  479.     Returns the 1-based index of the least significant set bit of <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt>. If <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> is zero, when <tt class="docutils literal"><span class="pre"><span class="Identifier">noUndefinedBitOpts</span></span></tt> is set, the result is 0, otherwise the result is undefined.
    480. 

  480. <p><strong class="examples_text">Example:</strong></p>
    481. 

  481. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">firstSetBit</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span>
    482. 

  482. <span class="Identifier">doAssert</span> <span class="Identifier">firstSetBit</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">2</span>
    483. 

  483. <span class="Identifier">doAssert</span> <span class="Identifier">firstSetBit</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0100'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span>
    484. 

  484. <span class="Identifier">doAssert</span> <span class="Identifier">firstSetBit</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1000'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">4</span>
    485. 

  485. <span class="Identifier">doAssert</span> <span class="Identifier">firstSetBit</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span></pre>
    486. 

  486.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L522" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    487. 

  487. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L522" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    488. 

  488. 

  489.   </dd>
    490. 

  490. </div>
    491. 

  491. 

  492. </div>
    493. 

  493. <div id="flipBit-procs-all">
    494. 

  494.   <div id="flipBit,T,BitsRange[T: SomeInteger]">
    495. 

  495.   <dt><pre><span class="Keyword">proc</span> <a href="#flipBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D"><span class="Identifier">flipBit</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">bit</span><span class="Other">:</span> <a href="bitops.html#BitsRange"><span class="Identifier">BitsRange</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    496. 

  496.   <dd>
    497. 

  497.     
    498. 

  498.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bit at position <tt class="docutils literal"><span class="pre"><span class="Identifier">bit</span></span></tt> flipped.
    499. 

  499. <p><strong class="examples_text">Example:</strong></p>
    500. 

  500. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    501. 

  501. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipBit</span><span class="Punctuation">(</span><span class="DecNumber">1'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    502. 

  502. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0001'</span><span class="Identifier">u8</span>
    503. 

  503. 

  504. <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    505. 

  505. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipBit</span><span class="Punctuation">(</span><span class="DecNumber">2'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    506. 

  506. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0111'</span><span class="Identifier">u8</span></pre>
    507. 

  507.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L301" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    508. 

  508. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L301" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    509. 

  509. 

  510.   </dd>
    511. 

  511. </div>
    512. 

  512. 

  513. </div>
    514. 

  514. <div id="flipMask-procs-all">
    515. 

  515.   <div id="flipMask,T,T">
    516. 

  516.   <dt><pre><span class="Keyword">proc</span> <a href="#flipMask%2CT%2CT"><span class="Identifier">flipMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    517. 

  517.   <dd>
    518. 

  518.     
    519. 

  519.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> flipped.</p>
    520. 

  520. <p>Effectively maps to a <a class="reference external" href="#bitxor.m,T,T,varargs[T]">bitxor</a> operation.</p>
    521. 

  521. 

  522. <p><strong class="examples_text">Example:</strong></p>
    523. 

  523. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    524. 

  524. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipMask</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    525. 

  525. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1001'</span><span class="Identifier">u8</span></pre>
    526. 

  526.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L261" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    527. 

  527. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L261" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    528. 

  528. 

  529.   </dd>
    530. 

  530. </div>
    531. 

  531. <div id="flipMask,T,Slice[int]">
    532. 

  532.   <dt><pre><span class="Keyword">proc</span> <a href="#flipMask%2CT%2CSlice%5Bint%5D"><span class="Identifier">flipMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    533. 

  533.   <dd>
    534. 

  534.     
    535. 

  535.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> flipped.</p>
    536. 

  536. <p>Effectively maps to a <a class="reference external" href="#bitxor.m,T,T,varargs[T]">bitxor</a> operation.</p>
    537. 

  537. 

  538. <p><strong class="examples_text">Example:</strong></p>
    539. 

  539. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    540. 

  540. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipMask</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span>
    541. 

  541. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1101'</span><span class="Identifier">u8</span></pre>
    542. 

  542.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L272" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    543. 

  543. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L272" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    544. 

  544. 

  545.   </dd>
    546. 

  546. </div>
    547. 

  547. 

  548. </div>
    549. 

  549. <div id="flipMasked-procs-all">
    550. 

  550.   <div id="flipMasked,T,T">
    551. 

  551.   <dt><pre><span class="Keyword">func</span> <a href="#flipMasked%2CT%2CT"><span class="Identifier">flipMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">,</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    552. 

  552.   <dd>
    553. 

  553.     
    554. 

  554.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> flipped.</p>
    555. 

  555. <p>Effectively maps to a <a class="reference external" href="#bitxor.m,T,T,varargs[T]">bitxor</a> operation.</p>
    556. 

  556. 

  557. <p><strong class="examples_text">Example:</strong></p>
    558. 

  558. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    559. 

  559. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipMasked</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1001'</span><span class="Identifier">u8</span></pre>
    560. 

  560.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L241" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    561. 

  561. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L241" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    562. 

  562. 

  563.   </dd>
    564. 

  564. </div>
    565. 

  565. <div id="flipMasked,T,Slice[int]">
    566. 

  566.   <dt><pre><span class="Keyword">func</span> <a href="#flipMasked%2CT%2CSlice%5Bint%5D"><span class="Identifier">flipMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    567. 

  567.   <dd>
    568. 

  568.     
    569. 

  569.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> flipped.</p>
    570. 

  570. <p>Effectively maps to a <a class="reference external" href="#bitxor.m,T,T,varargs[T]">bitxor</a> operation.</p>
    571. 

  571. 

  572. <p><strong class="examples_text">Example:</strong></p>
    573. 

  573. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    574. 

  574. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipMasked</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1101'</span><span class="Identifier">u8</span></pre>
    575. 

  575.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L251" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    576. 

  576. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L251" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    577. 

  577. 

  578.   </dd>
    579. 

  579. </div>
    580. 

  580. 

  581. </div>
    582. 

  582. <div id="mask-procs-all">
    583. 

  583.   <div id="mask,T,T">
    584. 

  584.   <dt><pre><span class="Keyword">proc</span> <a href="#mask%2CT%2CT"><span class="Identifier">mask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    585. 

  585.   <dd>
    586. 

  586.     
    587. 

  587.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with only the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> matching those of <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> set to 1.</p>
    588. 

  588. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation.</p>
    589. 

  589. 

  590. <p><strong class="examples_text">Example:</strong></p>
    591. 

  591. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    592. 

  592. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">mask</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    593. 

  593. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span></pre>
    594. 

  594.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L129" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    595. 

  595. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L129" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    596. 

  596. 

  597.   </dd>
    598. 

  598. </div>
    599. 

  599. <div id="mask,T,Slice[int]">
    600. 

  600.   <dt><pre><span class="Keyword">proc</span> <a href="#mask%2CT%2CSlice%5Bint%5D"><span class="Identifier">mask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    601. 

  601.   <dd>
    602. 

  602.     
    603. 

  603.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with only the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> matching those of <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> set to 1.</p>
    604. 

  604. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation.</p>
    605. 

  605. 

  606. <p><strong class="examples_text">Example:</strong></p>
    607. 

  607. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_1011'</span><span class="Identifier">u8</span>
    608. 

  608. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">mask</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span>
    609. 

  609. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span></pre>
    610. 

  610.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L141" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    611. 

  611. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L141" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    612. 

  612. 

  613.   </dd>
    614. 

  614. </div>
    615. 

  615. 

  616. </div>
    617. 

  617. <div id="masked-procs-all">
    618. 

  618.   <div id="masked,T,T">
    619. 

  619.   <dt><pre><span class="Keyword">proc</span> <a href="#masked%2CT%2CT"><span class="Identifier">masked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">,</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    620. 

  620.   <dd>
    621. 

  621.     
    622. 

  622.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with only the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> matching those of <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> set to 1.</p>
    623. 

  623. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation.</p>
    624. 

  624. 

  625. <p><strong class="examples_text">Example:</strong></p>
    626. 

  626. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    627. 

  627. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">masked</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_0010'</span><span class="Identifier">u8</span></pre>
    628. 

  628.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L107" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    629. 

  629. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L107" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    630. 

  630. 

  631.   </dd>
    632. 

  632. </div>
    633. 

  633. <div id="masked,T,Slice[int]">
    634. 

  634.   <dt><pre><span class="Keyword">func</span> <a href="#masked%2CT%2CSlice%5Bint%5D"><span class="Identifier">masked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    635. 

  635.   <dd>
    636. 

  636.     
    637. 

  637.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with only the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> matching those of <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> set to 1.</p>
    638. 

  638. <p>Effectively maps to a <a class="reference external" href="#bitand.m,T,T,varargs[T]">bitand</a> operation.</p>
    639. 

  639. 

  640. <p><strong class="examples_text">Example:</strong></p>
    641. 

  641. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_1011'</span><span class="Identifier">u8</span>
    642. 

  642. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">masked</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span></pre>
    643. 

  643.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L118" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    644. 

  644. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L118" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    645. 

  645. 

  646.   </dd>
    647. 

  647. </div>
    648. 

  648. 

  649. </div>
    650. 

  650. <div id="parityBits-procs-all">
    651. 

  651.   <div id="parityBits,SomeInteger">
    652. 

  652.   <dt><pre><span class="Keyword">func</span> <a href="#parityBits%2CSomeInteger"><span class="Identifier">parityBits</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    653. 

  653.   <dd>
    654. 

  654.     
    655. 

  655.     Calculate the bit parity in an integer. If the number of 1-bits is odd, the parity is 1, otherwise 0.
    656. 

  656. <p><strong class="examples_text">Example:</strong></p>
    657. 

  657. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">parityBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_0000'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span>
    658. 

  658. <span class="Identifier">doAssert</span> <span class="Identifier">parityBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0101_0001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span>
    659. 

  659. <span class="Identifier">doAssert</span> <span class="Identifier">parityBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0110_1001'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span>
    660. 

  660. <span class="Identifier">doAssert</span> <span class="Identifier">parityBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0111_1111'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">1</span></pre>
    661. 

  661.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L500" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    662. 

  662. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L500" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    663. 

  663. 

  664.   </dd>
    665. 

  665. </div>
    666. 

  666. 

  667. </div>
    668. 

  668. <div id="popcount-procs-all">
    669. 

  669.   <div id="popcount,SomeInteger">
    670. 

  670.   <dt><pre><span class="Keyword">func</span> <a href="#popcount%2CSomeInteger"><span class="Identifier">popcount</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    671. 

  671.   <dd>
    672. 

  672.     
    673. 

  673.     Alias for <a class="reference external" href="#countSetBits,SomeInteger">countSetBits</a> (Hamming weight).
    674. 

  674.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L496" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    675. 

  675. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L496" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    676. 

  676. 

  677.   </dd>
    678. 

  678. </div>
    679. 

  679. 

  680. </div>
    681. 

  681. <div id="reverseBits-procs-all">
    682. 

  682.   <div id="reverseBits,T">
    683. 

  683.   <dt><pre><span class="Keyword">func</span> <a href="#reverseBits%2CT"><span class="Identifier">reverseBits</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeUnsignedInt"><span class="Identifier">SomeUnsignedInt</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
    684. 

  684.   <dd>
    685. 

  685.     
    686. 

  686.     Return the bit reversal of x.
    687. 

  687. <p><strong class="examples_text">Example:</strong></p>
    688. 

  688. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">reverseBits</span><span class="Punctuation">(</span><span class="BinNumber">0b10100100'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b00100101'</span><span class="Identifier">u8</span>
    689. 

  689. <span class="Identifier">doAssert</span> <span class="Identifier">reverseBits</span><span class="Punctuation">(</span><span class="HexNumber">0xdd'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="HexNumber">0xbb'</span><span class="Identifier">u8</span>
    690. 

  690. <span class="Identifier">doAssert</span> <span class="Identifier">reverseBits</span><span class="Punctuation">(</span><span class="HexNumber">0xddbb'</span><span class="Identifier">u16</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="HexNumber">0xddbb'</span><span class="Identifier">u16</span>
    691. 

  691. <span class="Identifier">doAssert</span> <span class="Identifier">reverseBits</span><span class="Punctuation">(</span><span class="HexNumber">0xdeadbeef'</span><span class="Identifier">u32</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="HexNumber">0xf77db57b'</span><span class="Identifier">u32</span></pre>
    692. 

  692.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L848" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    693. 

  693. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L848" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    694. 

  694. 

  695.   </dd>
    696. 

  696. </div>
    697. 

  697. 

  698. </div>
    699. 

  699. <div id="rotateLeftBits-procs-all">
    700. 

  700.   <div id="rotateLeftBits,T,range[]">
    701. 

  701.   <dt><pre><span class="Keyword">func</span> <a href="#rotateLeftBits%2CT%2Crange%5B%5D"><span class="Identifier">rotateLeftBits</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeUnsignedInt"><span class="Identifier">SomeUnsignedInt</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">value</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span>
    702. 

  702.                                         <span class="Identifier">shift</span><span class="Other">:</span> <a href="system.html#range"><span class="Identifier">range</span></a><span class="Other">[</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="Other">(</span><span class="Identifier">sizeof</span><span class="Other">(</span><span class="Identifier">T</span><span class="Other">)</span> <span class="Operator">*</span> <span class="DecNumber">8</span><span class="Other">)</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.
    703. 

  703.     <span class="Identifier">inline</span>.}</pre></dt>
    704. 

  704.   <dd>
    705. 

  705.     
    706. 

  706.     Left-rotate bits in a <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt>.
    707. 

  707. <p><strong class="examples_text">Example:</strong></p>
    708. 

  708. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">rotateLeftBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0110_1001'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b1001_0110'</span><span class="Identifier">u8</span>
    709. 

  709. <span class="Identifier">doAssert</span> <span class="Identifier">rotateLeftBits</span><span class="Punctuation">(</span><span class="BinNumber">0b00111100_11000011'</span><span class="Identifier">u16</span><span class="Punctuation">,</span> <span class="DecNumber">8</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    710. 

  710.   <span class="BinNumber">0b11000011_00111100'</span><span class="Identifier">u16</span>
    711. 

  711. <span class="Identifier">doAssert</span> <span class="Identifier">rotateLeftBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000111111110000_1111000000001111'</span><span class="Identifier">u32</span><span class="Punctuation">,</span> <span class="DecNumber">16</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    712. 

  712.   <span class="BinNumber">0b1111000000001111_0000111111110000'</span><span class="Identifier">u32</span>
    713. 

  713. <span class="Identifier">doAssert</span> <span class="Identifier">rotateLeftBits</span><span class="Punctuation">(</span><span class="BinNumber">0b00000000111111111111111100000000_11111111000000000000000011111111'</span><span class="Identifier">u64</span><span class="Punctuation">,</span> <span class="DecNumber">32</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    714. 

  714.   <span class="BinNumber">0b11111111000000000000000011111111_00000000111111111111111100000000'</span><span class="Identifier">u64</span></pre>
    715. 

  715.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L785" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    716. 

  716. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L785" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    717. 

  717. 

  718.   </dd>
    719. 

  719. </div>
    720. 

  720. 

  721. </div>
    722. 

  722. <div id="rotateRightBits-procs-all">
    723. 

  723.   <div id="rotateRightBits,T,range[]">
    724. 

  724.   <dt><pre><span class="Keyword">func</span> <a href="#rotateRightBits%2CT%2Crange%5B%5D"><span class="Identifier">rotateRightBits</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeUnsignedInt"><span class="Identifier">SomeUnsignedInt</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">value</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span>
    725. 

  725.     <span class="Identifier">shift</span><span class="Other">:</span> <a href="system.html#range"><span class="Identifier">range</span></a><span class="Other">[</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="Other">(</span><span class="Identifier">sizeof</span><span class="Other">(</span><span class="Identifier">T</span><span class="Other">)</span> <span class="Operator">*</span> <span class="DecNumber">8</span><span class="Other">)</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    726. 

  726.   <dd>
    727. 

  727.     
    728. 

  728.     Right-rotate bits in a <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt>.
    729. 

  729. <p><strong class="examples_text">Example:</strong></p>
    730. 

  730. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">rotateRightBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0110_1001'</span><span class="Identifier">u8</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b1001_0110'</span><span class="Identifier">u8</span>
    731. 

  731. <span class="Identifier">doAssert</span> <span class="Identifier">rotateRightBits</span><span class="Punctuation">(</span><span class="BinNumber">0b00111100_11000011'</span><span class="Identifier">u16</span><span class="Punctuation">,</span> <span class="DecNumber">8</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    732. 

  732.   <span class="BinNumber">0b11000011_00111100'</span><span class="Identifier">u16</span>
    733. 

  733. <span class="Identifier">doAssert</span> <span class="Identifier">rotateRightBits</span><span class="Punctuation">(</span><span class="BinNumber">0b0000111111110000_1111000000001111'</span><span class="Identifier">u32</span><span class="Punctuation">,</span> <span class="DecNumber">16</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    734. 

  734.   <span class="BinNumber">0b1111000000001111_0000111111110000'</span><span class="Identifier">u32</span>
    735. 

  735. <span class="Identifier">doAssert</span> <span class="Identifier">rotateRightBits</span><span class="Punctuation">(</span><span class="BinNumber">0b00000000111111111111111100000000_11111111000000000000000011111111'</span><span class="Identifier">u64</span><span class="Punctuation">,</span> <span class="DecNumber">32</span><span class="Punctuation">)</span> <span class="Operator">==</span>
    736. 

  736.   <span class="BinNumber">0b11111111000000000000000011111111_00000000111111111111111100000000'</span><span class="Identifier">u64</span></pre>
    737. 

  737.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L813" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    738. 

  738. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L813" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    739. 

  739. 

  740.   </dd>
    741. 

  741. </div>
    742. 

  742. 

  743. </div>
    744. 

  744. <div id="setBit-procs-all">
    745. 

  745.   <div id="setBit,T,BitsRange[T: SomeInteger]">
    746. 

  746.   <dt><pre><span class="Keyword">proc</span> <a href="#setBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D"><span class="Identifier">setBit</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">bit</span><span class="Other">:</span> <a href="bitops.html#BitsRange"><span class="Identifier">BitsRange</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    747. 

  747.   <dd>
    748. 

  748.     
    749. 

  749.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bit at position <tt class="docutils literal"><span class="pre"><span class="Identifier">bit</span></span></tt> set to 1.
    750. 

  750. <p><strong class="examples_text">Example:</strong></p>
    751. 

  751. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    752. 

  752. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setBit</span><span class="Punctuation">(</span><span class="DecNumber">5'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    753. 

  753. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0010_0011'</span><span class="Identifier">u8</span></pre>
    754. 

  754.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L283" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    755. 

  755. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L283" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    756. 

  756. 

  757.   </dd>
    758. 

  758. </div>
    759. 

  759. 

  760. </div>
    761. 

  761. <div id="setMask-procs-all">
    762. 

  762.   <div id="setMask,T,T">
    763. 

  763.   <dt><pre><span class="Keyword">proc</span> <a href="#setMask%2CT%2CT"><span class="Identifier">setMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    764. 

  764.   <dd>
    765. 

  765.     
    766. 

  766.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> set to 1.</p>
    767. 

  767. <p>Effectively maps to a <a class="reference external" href="#bitor.m,T,T,varargs[T]">bitor</a> operation.</p>
    768. 

  768. 

  769. <p><strong class="examples_text">Example:</strong></p>
    770. 

  770. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    771. 

  771. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setMask</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span>
    772. 

  772. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1011'</span><span class="Identifier">u8</span></pre>
    773. 

  773.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L173" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    774. 

  774. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L173" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    775. 

  775. 

  776.   </dd>
    777. 

  777. </div>
    778. 

  778. <div id="setMask,T,Slice[int]">
    779. 

  779.   <dt><pre><span class="Keyword">proc</span> <a href="#setMask%2CT%2CSlice%5Bint%5D"><span class="Identifier">setMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    780. 

  780.   <dd>
    781. 

  781.     
    782. 

  782.     <p>Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> set to 1.</p>
    783. 

  783. <p>Effectively maps to a <a class="reference external" href="#bitor.m,T,T,varargs[T]">bitor</a> operation.</p>
    784. 

  784. 

  785. <p><strong class="examples_text">Example:</strong></p>
    786. 

  786. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    787. 

  787. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setMask</span><span class="Punctuation">(</span><span class="DecNumber">2</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span>
    788. 

  788. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span></pre>
    789. 

  789.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L184" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    790. 

  790. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L184" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    791. 

  791. 

  792.   </dd>
    793. 

  793. </div>
    794. 

  794. 

  795. </div>
    796. 

  796. <div id="setMasked-procs-all">
    797. 

  797.   <div id="setMasked,T,T">
    798. 

  798.   <dt><pre><span class="Keyword">func</span> <a href="#setMasked%2CT%2CT"><span class="Identifier">setMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">,</span> <span class="Identifier">mask</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    799. 

  799.   <dd>
    800. 

  800.     
    801. 

  801.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits from <tt class="docutils literal"><span class="pre"><span class="Identifier">mask</span></span></tt> set to 1.</p>
    802. 

  802. <p>Effectively maps to a <a class="reference external" href="#bitor.m,T,T,varargs[T]">bitor</a> operation.</p>
    803. 

  803. 

  804. <p><strong class="examples_text">Example:</strong></p>
    805. 

  805. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    806. 

  806. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setMasked</span><span class="Punctuation">(</span><span class="BinNumber">0b0000_1010'</span><span class="Identifier">u8</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1011'</span><span class="Identifier">u8</span></pre>
    807. 

  807.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L153" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    808. 

  808. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L153" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    809. 

  809. 

  810.   </dd>
    811. 

  811. </div>
    812. 

  812. <div id="setMasked,T,Slice[int]">
    813. 

  813.   <dt><pre><span class="Keyword">func</span> <a href="#setMasked%2CT%2CSlice%5Bint%5D"><span class="Identifier">setMasked</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    814. 

  814.   <dd>
    815. 

  815.     
    816. 

  816.     <p>Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with all the <tt class="docutils literal"><span class="pre"><span class="DecNumber">1</span></span></tt> bits in the range of <tt class="docutils literal"><span class="pre"><span class="Identifier">slice</span></span></tt> set to 1.</p>
    817. 

  817. <p>Effectively maps to a <a class="reference external" href="#bitor.m,T,T,varargs[T]">bitor</a> operation.</p>
    818. 

  818. 

  819. <p><strong class="examples_text">Example:</strong></p>
    820. 

  820. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    821. 

  821. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setMasked</span><span class="Punctuation">(</span><span class="DecNumber">2</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span></pre>
    822. 

  822.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L163" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    823. 

  823. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L163" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    824. 

  824. 

  825.   </dd>
    826. 

  826. </div>
    827. 

  827. 

  828. </div>
    829. 

  829. <div id="testBit-procs-all">
    830. 

  830.   <div id="testBit,T,BitsRange[T: SomeInteger]">
    831. 

  831.   <dt><pre><span class="Keyword">proc</span> <a href="#testBit%2CT%2CBitsRange%5BT%3A%20SomeInteger%5D"><span class="Identifier">testBit</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">bit</span><span class="Other">:</span> <a href="bitops.html#BitsRange"><span class="Identifier">BitsRange</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#bool"><span class="Identifier">bool</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    832. 

  832.   <dd>
    833. 

  833.     
    834. 

  834.     Returns true if the bit in <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt> at positions <tt class="docutils literal"><span class="pre"><span class="Identifier">bit</span></span></tt> is set to 1.
    835. 

  835. <p><strong class="examples_text">Example:</strong></p>
    836. 

  836. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span>
    837. 

  837. <span class="Identifier">doAssert</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">testBit</span><span class="Punctuation">(</span><span class="DecNumber">0</span><span class="Punctuation">)</span>
    838. 

  838. <span class="Identifier">doAssert</span> <span class="Keyword">not</span> <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">testBit</span><span class="Punctuation">(</span><span class="DecNumber">7</span><span class="Punctuation">)</span></pre>
    839. 

  839.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L351" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    840. 

  840. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L351" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    841. 

  841. 

  842.   </dd>
    843. 

  843. </div>
    844. 

  844. 

  845. </div>
    846. 

  846. <div id="toMask-procs-all">
    847. 

  847.   <div id="toMask,Slice[int]">
    848. 

  848.   <dt><pre><span class="Keyword">func</span> <a href="#toMask%2CSlice%5Bint%5D"><span class="Identifier">toMask</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">slice</span><span class="Other">:</span> <a href="system.html#Slice"><span class="Identifier">Slice</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    849. 

  849.   <dd>
    850. 

  850.     
    851. 

  851.     Creates a bitmask based on a slice of bits.
    852. 

  852. <p><strong class="examples_text">Example:</strong></p>
    853. 

  853. <pre class="listing"><span class="Identifier">doAssert</span> <span class="Identifier">toMask</span><span class="Punctuation">[</span><span class="Identifier">int32</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b1110'i32</span>
    854. 

  854. <span class="Identifier">doAssert</span> <span class="Identifier">toMask</span><span class="Punctuation">[</span><span class="Identifier">int32</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="DecNumber">0</span> <span class="Operator">..</span> <span class="DecNumber">3</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="BinNumber">0b1111'i32</span></pre>
    855. 

  855.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L96" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    856. 

  856. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L96" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    857. 

  857. 

  858.   </dd>
    859. 

  859. </div>
    860. 

  860. 

  861. </div>
    862. 

  862. 

  863.   </dl>
    864. 

  864. </div>
    865. 

  865. <div class="section" id="17">
    866. 

  866.   <h1><a class="toc-backref" href="#17">Macros</a></h1>
    867. 

  867.   <dl class="item">
    868. 

  868.     <div id="bitand-macros-all">
    869. 

  869.   <div id="bitand.m,T,T,varargs[T]">
    870. 

  870.   <dt><pre><span class="Keyword">macro</span> <a href="#bitand.m%2CT%2CT%2Cvarargs%5BT%5D"><span class="Identifier">bitand</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">,</span> <span class="Identifier">y</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">z</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
    871. 

  871.   <dd>
    872. 

  872.     
    873. 

  873.     Computes the <tt class="docutils literal"><span class="pre"><span class="Identifier">bitwise</span> <span class="Keyword">and</span></span></tt> of all arguments collectively.
    874. 

  874.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L41" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    875. 

  875. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L41" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    876. 

  876. 

  877.   </dd>
    878. 

  878. </div>
    879. 

  879. 

  880. </div>
    881. 

  881. <div id="bitor-macros-all">
    882. 

  882.   <div id="bitor.m,T,T,varargs[T]">
    883. 

  883.   <dt><pre><span class="Keyword">macro</span> <a href="#bitor.m%2CT%2CT%2Cvarargs%5BT%5D"><span class="Identifier">bitor</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">,</span> <span class="Identifier">y</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">z</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
    884. 

  884.   <dd>
    885. 

  885.     
    886. 

  886.     Computes the <tt class="docutils literal"><span class="pre"><span class="Identifier">bitwise</span> <span class="Keyword">or</span></span></tt> of all arguments collectively.
    887. 

  887.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L48" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    888. 

  888. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L48" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    889. 

  889. 

  890.   </dd>
    891. 

  891. </div>
    892. 

  892. 

  893. </div>
    894. 

  894. <div id="bitxor-macros-all">
    895. 

  895.   <div id="bitxor.m,T,T,varargs[T]">
    896. 

  896.   <dt><pre><span class="Keyword">macro</span> <a href="#bitxor.m%2CT%2CT%2Cvarargs%5BT%5D"><span class="Identifier">bitxor</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <a href="system.html#SomeInteger"><span class="Identifier">SomeInteger</span></a><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">,</span> <span class="Identifier">y</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">;</span> <span class="Identifier">z</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
    897. 

  897.   <dd>
    898. 

  898.     
    899. 

  899.     Computes the <tt class="docutils literal"><span class="pre"><span class="Identifier">bitwise</span> <span class="Keyword">xor</span></span></tt> of all arguments collectively.
    900. 

  900.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L55" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    901. 

  901. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L55" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    902. 

  902. 

  903.   </dd>
    904. 

  904. </div>
    905. 

  905. 

  906. </div>
    907. 

  907. <div id="clearBits-macros-all">
    908. 

  908.   <div id="clearBits.m,typed,varargs[typed]">
    909. 

  909.   <dt><pre><span class="Keyword">macro</span> <a href="#clearBits.m%2Ctyped%2Cvarargs%5Btyped%5D"><span class="Identifier">clearBits</span></a><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">;</span> <span class="Identifier">bits</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
    910. 

  910.   <dd>
    911. 

  911.     
    912. 

  912.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bits at positions <tt class="docutils literal"><span class="pre"><span class="Identifier">bits</span></span></tt> set to 0.
    913. 

  913. <p><strong class="examples_text">Example:</strong></p>
    914. 

  914. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b1111_1111'</span><span class="Identifier">u8</span>
    915. 

  915. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">clearBits</span><span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">)</span>
    916. 

  916. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b0101_0101'</span><span class="Identifier">u8</span></pre>
    917. 

  917.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L326" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    918. 

  918. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L326" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    919. 

  919. 

  920.   </dd>
    921. 

  921. </div>
    922. 

  922. 

  923. </div>
    924. 

  924. <div id="flipBits-macros-all">
    925. 

  925.   <div id="flipBits.m,typed,varargs[typed]">
    926. 

  926.   <dt><pre><span class="Keyword">macro</span> <a href="#flipBits.m%2Ctyped%2Cvarargs%5Btyped%5D"><span class="Identifier">flipBits</span></a><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">;</span> <span class="Identifier">bits</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
    927. 

  927.   <dd>
    928. 

  928.     
    929. 

  929.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bits at positions <tt class="docutils literal"><span class="pre"><span class="Identifier">bits</span></span></tt> set to 0.
    930. 

  930. <p><strong class="examples_text">Example:</strong></p>
    931. 

  931. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_1111'</span><span class="Identifier">u8</span>
    932. 

  932. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">flipBits</span><span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">)</span>
    933. 

  933. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b1010_0101'</span><span class="Identifier">u8</span></pre>
    934. 

  934.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L338" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    935. 

  935. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L338" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    936. 

  936. 

  937.   </dd>
    938. 

  938. </div>
    939. 

  939. 

  940. </div>
    941. 

  941. <div id="setBits-macros-all">
    942. 

  942.   <div id="setBits.m,typed,varargs[typed]">
    943. 

  943.   <dt><pre><span class="Keyword">macro</span> <a href="#setBits.m%2Ctyped%2Cvarargs%5Btyped%5D"><span class="Identifier">setBits</span></a><span class="Other">(</span><span class="Identifier">v</span><span class="Other">:</span> <a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">;</span> <span class="Identifier">bits</span><span class="Other">:</span> <a href="system.html#varargs"><span class="Identifier">varargs</span></a><span class="Other">[</span><a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
    944. 

  944.   <dd>
    945. 

  945.     
    946. 

  946.     Mutates <tt class="docutils literal"><span class="pre"><span class="Identifier">v</span></span></tt>, with the bits at positions <tt class="docutils literal"><span class="pre"><span class="Identifier">bits</span></span></tt> set to 1.
    947. 

  947. <p><strong class="examples_text">Example:</strong></p>
    948. 

  948. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">v</span> <span class="Operator">=</span> <span class="BinNumber">0b0000_0011'</span><span class="Identifier">u8</span>
    949. 

  949. <span class="Identifier">v</span><span class="Operator">.</span><span class="Identifier">setBits</span><span class="Punctuation">(</span><span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">)</span>
    950. 

  950. <span class="Identifier">doAssert</span> <span class="Identifier">v</span> <span class="Operator">==</span> <span class="BinNumber">0b1010_1011'</span><span class="Identifier">u8</span></pre>
    951. 

  951.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/bitops.nim#L314" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    952. 

  952. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/bitops.nim#L314" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    953. 

  953. 

  954.   </dd>
    955. 

  955. </div>
    956. 

  956. 

  957. </div>
    958. 

  958. 

  959.   </dl>
    960. 

  960. </div>
    961. 

  961. 

  962.   </div>
    963. 

  963. </div>
    964. 

  964. 

  965.       <div class="twelve-columns footer">
    966. 

  966.         <span class="nim-sprite"></span>
    967. 

  967.         <br>
    968. 

  968.         <small style="color: var(--hint);">Made with Nim. Generated: 2025-02-06 22:28:10 UTC</small>
    969. 

  969.       </div>
    970. 

  970.     </div>
    971. 

  971.   </div>
    972. 

  972.       <script defer data-domain="nim-lang.org" src="https://plausible.io/js/plausible.js"></script>
    973. 

  973.     
    974. 

  974. </body>
    975. 

  975. </html>
    976. 

  976.