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      <h1 class="title">std/decls</h1>
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  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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    <summary><a class="reference reference-toplevel" href="#17" id="67">Macros</a></summary>
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      <ul class="simple nested-toc-section">byaddr
  <li><a class="reference" href="#byaddr.m" title="byaddr(sect)">byaddr(sect)</a></li>

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    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/decls.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
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    <p class="module-desc">This module implements syntax sugar for some declarations.</p>
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  <h1><a class="toc-backref" href="#6">Imports</a></h1>
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  <h1><a class="toc-backref" href="#17">Macros</a></h1>
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  <div id="byaddr.m">
  <dt><pre><span class="Keyword">macro</span> <a href="#byaddr.m"><span class="Identifier">byaddr</span></a><span class="Other">(</span><span class="Identifier">sect</span><span class="Other">)</span></pre></dt>
  <dd>
    
    Allows a syntax for l-value references, being an exact analog to <tt class="docutils literal"><span class="pre"><span class="Identifier">auto</span><span class="Operator">&amp;</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Identifier">ex</span><span class="Punctuation">;</span></span></tt> in C++.<div class="admonition admonition-warning"><span class="admonition-warning-text"><b>Warning:</b></span>
This makes use of 2 experimental features, namely nullary templates instantiated as symbols and variable macro pragmas. For this reason, its behavior is not stable. The current implementation allows redefinition, but this is not an intended consequence.</div>

<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">var</span> <span class="Identifier">s</span> <span class="Operator">=</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">11</span><span class="Punctuation">,</span> <span class="DecNumber">12</span><span class="Punctuation">]</span>
<span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">byaddr</span><span class="Operator">.</span><span class="Punctuation">}</span> <span class="Operator">=</span> <span class="Identifier">s</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span>
<span class="Identifier">a</span> <span class="Operator">+=</span> <span class="DecNumber">100</span>
<span class="Identifier">assert</span> <span class="Identifier">s</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">110</span><span class="Punctuation">,</span> <span class="DecNumber">11</span><span class="Punctuation">,</span> <span class="DecNumber">12</span><span class="Punctuation">]</span>
<span class="Identifier">assert</span> <span class="Identifier">a</span> <span class="Keyword">is</span> <span class="Identifier">int</span>
<span class="Keyword">var</span> <span class="Identifier">b</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">byaddr</span><span class="Operator">.</span><span class="Punctuation">}</span><span class="Punctuation">:</span> <span class="Identifier">int</span> <span class="Operator">=</span> <span class="Identifier">s</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span>
<span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Keyword">addr</span> <span class="Operator">==</span> <span class="Identifier">b</span><span class="Operator">.</span><span class="Keyword">addr</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/decls.nim#L5" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/decls.nim#L5" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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