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<title>Struct first</title>
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<div class="refentry">
<a name="boost.proto.functional.first"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct first</span></h2>
<p>boost::proto::functional::first &#8212; 
            A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that returns
            the first element of a <code class="computeroutput">std::pair&lt;&gt;</code>.
          </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../proto/reference.html#header.boost.proto.functional.std.utility_hpp" title="Header &lt;boost/proto/functional/std/utility.hpp&gt;">boost/proto/functional/std/utility.hpp</a>&gt;

</span>
<span class="keyword">struct</span> <a class="link" href="first.html" title="Struct first">first</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../callable.html" title="Struct callable">proto::callable</a> <span class="special">{</span>
  <span class="comment">// member classes/structs/unions</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="first/result_This_Pa_idp66737176.html" title="Struct template result&lt;This(Pair)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Pair</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <a class="link" href="first/result_This_Pa_idp66737176.html#boost.proto.functional.first.result_This(Pa_idp66737176.type"><span class="identifier">type</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="first/result_This_Pa_idp66739336.html" title="Struct template result&lt;This(Pair &amp;)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Pair</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="special">&amp;</span> <a class="link" href="first/result_This_Pa_idp66739336.html#boost.proto.functional.first.result_This(Pa_idp66739336.type"><span class="identifier">type</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="first/result_This_Pa_idp66741496.html" title="Struct template result&lt;This(Pair const &amp;)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Pair</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a class="link" href="first/result_This_Pa_idp66741496.html#boost.proto.functional.first.result_This(Pa_idp66741496.type"><span class="identifier">type</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="first.html#idp66743688-bb">public member functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Pair<span class="special">&gt;</span> <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="special">&amp;</span> <a class="link" href="first.html#idp66743976-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Pair</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
    <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a class="link" href="first.html#idp66746520-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Pair</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp178606440"></a><h2>Description</h2>
<p>
              A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that returns
              the first element of a <code class="computeroutput">std::pair&lt;&gt;</code>.</p>
<div class="refsect2">
<a name="idp178607816"></a><h3>
<a name="idp66743688-bb"></a><code class="computeroutput">first</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
  <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="special">&amp;</span> <a name="idp66743976-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Pair</span> <span class="special">&amp;</span> pair<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
                  <code class="computeroutput">pair.first</code>
                </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Pair<span class="special">&gt;</span> 
  <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a name="idp66746520-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Pair</span> <span class="keyword">const</span> <span class="special">&amp;</span> pair<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
                  <code class="computeroutput">pair.first</code>
                </p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
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