formatfloat.html 21 KB

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  23. <h1 class="title">std/formatfloat</h1>
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  48. <ul class="simple simple-toc" id="toc-list">
  49. <li>
  50. <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
  51. </li>
  52. <li>
  53. <details open>
  54. <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
  55. <ul class="simple simple-toc-section">
  56. <ul class="simple nested-toc-section">$
  57. <li><a class="reference" href="#%24" title="`$`(x: float | float32): string">`$`(x: float | float32): string</a></li>
  58. </ul>
  59. <ul class="simple nested-toc-section">addFloat
  60. <li><a class="reference" href="#addFloat%2Cstring%2C" title="addFloat(result: var string; x: float | float32)">addFloat(result: var string; x: float | float32)</a></li>
  61. </ul>
  62. <ul class="simple nested-toc-section">addFloatRoundtrip
  63. <li><a class="reference" href="#addFloatRoundtrip%2Cstring%2C" title="addFloatRoundtrip(result: var string; x: float | float32)">addFloatRoundtrip(result: var string; x: float | float32)</a></li>
  64. </ul>
  65. <ul class="simple nested-toc-section">addFloatSprintf
  66. <li><a class="reference" href="#addFloatSprintf%2Cstring%2Cfloat" title="addFloatSprintf(result: var string; x: float)">addFloatSprintf(result: var string; x: float)</a></li>
  67. </ul>
  68. <ul class="simple nested-toc-section">writeFloatToBuffer
  69. <li><a class="reference" href="#writeFloatToBuffer%2Carray%5B%2Cchar%5D%2C" title="writeFloatToBuffer(buf: var array[65, char]; value: BiggestFloat | float32): int">writeFloatToBuffer(buf: var array[65, char]; value: BiggestFloat | float32): int</a></li>
  70. </ul>
  71. <ul class="simple nested-toc-section">writeFloatToBufferRoundtrip
  72. <li><a class="reference" href="#writeFloatToBufferRoundtrip%2Carray%5B%2Cchar%5D%2CBiggestFloat" title="writeFloatToBufferRoundtrip(buf: var array[65, char]; value: BiggestFloat): int">writeFloatToBufferRoundtrip(buf: var array[65, char]; value: BiggestFloat): int</a></li>
  73. <li><a class="reference" href="#writeFloatToBufferRoundtrip%2Carray%5B%2Cchar%5D%2Cfloat32" title="writeFloatToBufferRoundtrip(buf: var array[65, char]; value: float32): int">writeFloatToBufferRoundtrip(buf: var array[65, char]; value: float32): int</a></li>
  74. </ul>
  75. <ul class="simple nested-toc-section">writeFloatToBufferSprintf
  76. <li><a class="reference" href="#writeFloatToBufferSprintf%2Carray%5B%2Cchar%5D%2CBiggestFloat" title="writeFloatToBufferSprintf(buf: var array[65, char]; value: BiggestFloat): int">writeFloatToBufferSprintf(buf: var array[65, char]; value: BiggestFloat): int</a></li>
  77. </ul>
  78. </ul>
  79. </details>
  80. </li>
  81. </ul>
  82. </div>
  83. <div class="nine columns" id="content">
  84. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  85. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  86. <div id="tocRoot"></div>
  87. <p class="module-desc">This module implements formatting floats as strings.</p>
  88. <div class="section" id="6">
  89. <h1><a class="toc-backref" href="#6">Imports</a></h1>
  90. <dl class="item">
  91. <a class="reference external" href="assertions.html">assertions</a>, <a class="reference external" href="dragonbox.html">dragonbox</a>, <a class="reference external" href="schubfach.html">schubfach</a>
  92. </dl>
  93. </div>
  94. <div class="section" id="12">
  95. <h1><a class="toc-backref" href="#12">Procs</a></h1>
  96. <dl class="item">
  97. <div id="$-procs-all">
  98. <div id="$">
  99. <dt><pre><span class="Keyword">func</span> <a href="#%24"><span class="Identifier">`$`</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#float"><span class="Identifier">float</span></a> <span class="Operator">|</span> <a href="system.html#float32"><span class="Identifier">float32</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a></pre></dt>
  100. <dd>
  101. Outplace version of <tt class="docutils literal"><span class="pre"><span class="Identifier">addFloat</span></span></tt>.
  102. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L141" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  103. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L141" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  104. </dd>
  105. </div>
  106. </div>
  107. <div id="addFloat-procs-all">
  108. <div id="addFloat,string,">
  109. <dt><pre><span class="Keyword">proc</span> <a href="#addFloat%2Cstring%2C"><span class="Identifier">addFloat</span></a><span class="Other">(</span><span class="Identifier">result</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#float"><span class="Identifier">float</span></a> <span class="Operator">|</span> <a href="system.html#float32"><span class="Identifier">float32</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
  110. <dd>
  111. Converts float to its string representation and appends it to <tt class="docutils literal"><span class="pre"><span class="Identifier">result</span></span></tt>.
  112. <p><strong class="examples_text">Example:</strong></p>
  113. <pre class="listing"><span class="Keyword">var</span>
  114. <span class="Identifier">s</span> <span class="Operator">=</span> <span class="StringLit">&quot;foo:&quot;</span>
  115. <span class="Identifier">b</span> <span class="Operator">=</span> <span class="FloatNumber">45.67</span>
  116. <span class="Identifier">s</span><span class="Operator">.</span><span class="Identifier">addFloat</span><span class="Punctuation">(</span><span class="FloatNumber">45.67</span><span class="Punctuation">)</span>
  117. <span class="Identifier">assert</span> <span class="Identifier">s</span> <span class="Operator">==</span> <span class="StringLit">&quot;foo:45.67&quot;</span></pre>
  118. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L121" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  119. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L121" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  120. </dd>
  121. </div>
  122. </div>
  123. <div id="addFloatRoundtrip-procs-all">
  124. <div id="addFloatRoundtrip,string,">
  125. <dt><pre><span class="Keyword">proc</span> <a href="#addFloatRoundtrip%2Cstring%2C"><span class="Identifier">addFloatRoundtrip</span></a><span class="Other">(</span><span class="Identifier">result</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#float"><span class="Identifier">float</span></a> <span class="Operator">|</span> <a href="system.html#float32"><span class="Identifier">float32</span></a><span class="Other">)</span></pre></dt>
  126. <dd>
  127. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L87" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  128. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L87" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  129. </dd>
  130. </div>
  131. </div>
  132. <div id="addFloatSprintf-procs-all">
  133. <div id="addFloatSprintf,string,float">
  134. <dt><pre><span class="Keyword">proc</span> <a href="#addFloatSprintf%2Cstring%2Cfloat"><span class="Identifier">addFloatSprintf</span></a><span class="Other">(</span><span class="Identifier">result</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#float"><span class="Identifier">float</span></a><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>
  135. <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  136. <dd>
  137. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L95" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  138. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L95" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  139. </dd>
  140. </div>
  141. </div>
  142. <div id="writeFloatToBuffer-procs-all">
  143. <div id="writeFloatToBuffer,array[,char],">
  144. <dt><pre><span class="Keyword">proc</span> <a href="#writeFloatToBuffer%2Carray%5B%2Cchar%5D%2C"><span class="Identifier">writeFloatToBuffer</span></a><span class="Other">(</span><span class="Identifier">buf</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#array"><span class="Identifier">array</span></a><span class="Other">[</span><span class="DecNumber">65</span><span class="Other">,</span> <a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">:</span> <a href="ctypes.html#BiggestFloat"><span class="Identifier">BiggestFloat</span></a> <span class="Operator">|</span> <a href="system.html#float32"><span class="Identifier">float32</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.
  145. <span class="Identifier">inline</span>.}</pre></dt>
  146. <dd>
  147. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L81" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  148. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L81" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  149. </dd>
  150. </div>
  151. </div>
  152. <div id="writeFloatToBufferRoundtrip-procs-all">
  153. <div id="writeFloatToBufferRoundtrip,array[,char],BiggestFloat">
  154. <dt><pre><span class="Keyword">proc</span> <a href="#writeFloatToBufferRoundtrip%2Carray%5B%2Cchar%5D%2CBiggestFloat"><span class="Identifier">writeFloatToBufferRoundtrip</span></a><span class="Other">(</span><span class="Identifier">buf</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#array"><span class="Identifier">array</span></a><span class="Other">[</span><span class="DecNumber">65</span><span class="Other">,</span> <a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">:</span> <a href="ctypes.html#BiggestFloat"><span class="Identifier">BiggestFloat</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.
  155. <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> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  156. <dd>
  157. <p>This is the implementation to format floats.</p>
  158. <p>returns the amount of bytes written to <tt class="docutils literal"><span class="pre"><span class="Identifier">buf</span></span></tt> not counting the terminating '0' character.</p>
  159. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L26" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  160. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L26" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  161. </dd>
  162. </div>
  163. <div id="writeFloatToBufferRoundtrip,array[,char],float32">
  164. <dt><pre><span class="Keyword">proc</span> <a href="#writeFloatToBufferRoundtrip%2Carray%5B%2Cchar%5D%2Cfloat32"><span class="Identifier">writeFloatToBufferRoundtrip</span></a><span class="Other">(</span><span class="Identifier">buf</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#array"><span class="Identifier">array</span></a><span class="Other">[</span><span class="DecNumber">65</span><span class="Other">,</span> <a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">:</span> <a href="system.html#float32"><span class="Identifier">float32</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.
  165. <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> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  166. <dd>
  167. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L34" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  168. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L34" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  169. </dd>
  170. </div>
  171. </div>
  172. <div id="writeFloatToBufferSprintf-procs-all">
  173. <div id="writeFloatToBufferSprintf,array[,char],BiggestFloat">
  174. <dt><pre><span class="Keyword">proc</span> <a href="#writeFloatToBufferSprintf%2Carray%5B%2Cchar%5D%2CBiggestFloat"><span class="Identifier">writeFloatToBufferSprintf</span></a><span class="Other">(</span><span class="Identifier">buf</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="system.html#array"><span class="Identifier">array</span></a><span class="Other">[</span><span class="DecNumber">65</span><span class="Other">,</span> <a href="system.html#char"><span class="Identifier">char</span></a><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">:</span> <a href="ctypes.html#BiggestFloat"><span class="Identifier">BiggestFloat</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.
  175. <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> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  176. <dd>
  177. <p>This is the implementation to format floats.</p>
  178. <p>returns the amount of bytes written to <tt class="docutils literal"><span class="pre"><span class="Identifier">buf</span></span></tt> not counting the terminating '0' character.</p>
  179. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/formatfloat.nim#L47" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  180. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/formatfloat.nim#L47" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  181. </dd>
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