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      <h1 class="title">std/private/since</h1>
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    <summary><a class="reference reference-toplevel" href="#18" id="68">Templates</a></summary>
    <ul class="simple simple-toc-section">
      <ul class="simple nested-toc-section">since
  <li><a class="reference" href="#since.t%2C%2Cuntyped" title="since(version: (int, int); body: untyped)">since(version: (int, int); body: untyped)</a></li>
<li><a class="reference" href="#since.t%2C%2Cuntyped_2" title="since(version: (int, int, int); body: untyped)">since(version: (int, int, int); body: untyped)</a></li>

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  <div class="nine columns" id="content">
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/private/since.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/private/since.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

    <div id="tocRoot"></div>
    
    <p class="module-desc"><p><tt class="docutils literal"><span class="pre"><span class="Identifier">since</span></span></tt> is used to emulate older versions of nim stdlib, see <tt class="docutils literal"><span class="pre"><span class="Identifier">tuse_version</span><span class="Operator">.</span><span class="Identifier">nim</span></span></tt>.</p>
<p>If a symbol <tt class="docutils literal"><span class="pre"><span class="Identifier">foo</span></span></tt> is added in version <tt class="docutils literal"><span class="pre"><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></tt>, use <tt class="docutils literal"><span class="pre"><span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">since</span><span class="Punctuation">:</span> <span class="Punctuation">(</span><span class="FloatNumber">1.3</span><span class="Operator">.</span><span class="DecNumber">5</span><span class="Punctuation">)</span><span class="Operator">.</span><span class="Punctuation">}</span></span></tt>, not <tt class="docutils literal"><span class="pre"><span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">since</span><span class="Punctuation">:</span> <span class="Punctuation">(</span><span class="FloatNumber">1.4</span><span class="Punctuation">)</span><span class="Operator">.</span><span class="Punctuation">}</span></span></tt>, so that it works in devel in between releases.</p>
<p>The emulation cannot be 100% faithful and to avoid adding too much complexity, <tt class="docutils literal"><span class="pre"><span class="Identifier">since</span></span></tt> is not needed in those cases:</p>
<ul class="simple"><li>if a new module is added</li>
<li>if an overload is added</li>
<li>if an extra parameter to an existing routine is added</li>
</ul>
</p>
    <div class="section" id="18">
  <h1><a class="toc-backref" href="#18">Templates</a></h1>
  <dl class="item">
    <div id="since-templates-all">
  <div id="since.t,,untyped">
  <dt><pre><span class="Keyword">template</span> <a href="#since.t%2C%2Cuntyped"><span class="Identifier">since</span></a><span class="Other">(</span><span class="Identifier">version</span><span class="Other">:</span> <span class="Other">(</span><a href="system.html#int"><span class="Identifier">int</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">body</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a><span class="Other">)</span> {.<span class="Identifier">dirty</span>.}</pre></dt>
  <dd>
    
    <p>Evaluates <tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt> if the <tt class="docutils literal"><span class="pre">(NimMajor, NimMinor)</span></tt> is greater than or equal to <tt class="docutils literal"><span class="pre"><span class="Identifier">version</span></span></tt>. Usage:</p>
<p><pre class="listing"><span class="Keyword">proc</span> <span class="Identifier">fun</span><span class="Operator">*</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">since</span><span class="Punctuation">:</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="Operator">.</span><span class="Punctuation">}</span>
<span class="Identifier">since</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="Punctuation">:</span> <span class="Identifier">fun</span><span class="Punctuation">(</span><span class="Punctuation">)</span></pre></p>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/private/since.nim#L15" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/private/since.nim#L15" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
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<div id="since.t,,untyped_2">
  <dt><pre><span class="Keyword">template</span> <a href="#since.t%2C%2Cuntyped_2"><span class="Identifier">since</span></a><span class="Other">(</span><span class="Identifier">version</span><span class="Other">:</span> <span class="Other">(</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">,</span> <a href="system.html#int"><span class="Identifier">int</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">body</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a><span class="Other">)</span> {.<span class="Identifier">dirty</span>.}</pre></dt>
  <dd>
    
    <p>Evaluates <tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt> if <tt class="docutils literal"><span class="pre">(NimMajor, NimMinor, NimPatch)</span></tt> is greater than or equal to <tt class="docutils literal"><span class="pre"><span class="Identifier">version</span></span></tt>. Usage:</p>
<p><pre class="listing"><span class="Keyword">proc</span> <span class="Identifier">fun</span><span class="Operator">*</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">since</span><span class="Punctuation">:</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">1</span><span class="Punctuation">)</span><span class="Operator">.</span><span class="Punctuation">}</span>
<span class="Identifier">since</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">1</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Identifier">fun</span><span class="Punctuation">(</span><span class="Punctuation">)</span></pre></p>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/private/since.nim#L25" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/private/since.nim#L25" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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