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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
+<title>Struct _byval</title>
+<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
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+<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
+<link rel="up" href="../../proto/reference.html#header.boost.proto.transform.arg_hpp" title="Header &lt;boost/proto/transform/arg.hpp&gt;">
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+<link rel="next" href="_byval/result_This_boost_refer_id1529876.html" title="Struct template result&lt;This(boost::reference_wrapper&lt; T &gt;)&gt;">
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+</div>
+<div class="refentry">
+<a name="boost.proto._byval"></a><div class="titlepage"></div>
+<div class="refnamediv">
+<h2><span class="refentrytitle">Struct _byval</span></h2>
+<p>boost::proto::_byval &#8212;
+ A unary callable <a class="link" href="../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> that strips references and
+ <code class="computeroutput">boost::reference_wrapper&lt;&gt;</code> from its argument.
+ </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.transform.arg_hpp" title="Header &lt;boost/proto/transform/arg.hpp&gt;">boost/proto/transform/arg.hpp</a>&gt;
+
+</span>
+<span class="keyword">struct</span> <a class="link" href="_byval.html" title="Struct _byval">_byval</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> T<span class="special">&gt;</span>
+ <span class="keyword">struct</span> <a class="link" href="_byval/result_This_boost_refer_id1529876.html" title="Struct template result&lt;This(boost::reference_wrapper&lt; T &gt;)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">reference_wrapper</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword"></span> <span class="identifier">result</span><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">&gt;</span> <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> T<span class="special">&gt;</span>
+ <span class="keyword">struct</span> <a class="link" href="_byval/result_This_T____id1529906.html" title="Struct template result&lt;This(T &amp;)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">T</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword"></span> <span class="identifier">result</span><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">&gt;</span> <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> T<span class="special">&gt;</span>
+ <span class="keyword">struct</span> <a class="link" href="_byval/result_This_T__id1529936.html" title="Struct template result&lt;This(T)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">T</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="identifier">T</span> <a class="link" href="_byval/result_This_T__id1529936.html#boost.proto._byval.result_This(T)_id1529936.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="_byval.html#id1529972-bb">public member functions</a></span>
+ <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">T</span> <a class="link" href="_byval.html#id1529977-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">T</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="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
+ <span class="identifier">T</span> <a class="link" href="_byval.html#id1530033-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">reference_wrapper</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</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="id2855852"></a><h2>Description</h2>
+<p>
+ Example:
+ </p>
+<pre class="programlisting"><a class="link" href="terminal.html" title="Struct template terminal">proto::terminal</a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="identifier">i</span> <span class="special">=</span> <span class="special">{</span><span class="number">42</span><span class="special">}</span><span class="special">;</span>
+<span class="keyword">int</span> <span class="identifier">j</span> <span class="special">=</span> <span class="number">67</span><span class="special">;</span>
+<span class="keyword">int</span> <span class="identifier">k</span> <span class="special">=</span> <a class="link" href="when.html" title="Struct template when">proto::when</a><span class="special">&lt;</span><a class="link" href="_.html" title="Struct _">proto::_</a><span class="special">,</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">_byval</span><span class="special">(</span><a class="link" href="_state.html" title="Struct _state">proto::_state</a><span class="special">)</span><span class="special">&gt;</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">j</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
+<span class="identifier">assert</span><span class="special">(</span> <span class="number">67</span> <span class="special">==</span> <span class="identifier">k</span> <span class="special">)</span><span class="special">;</span></pre>
+<p>
+ </p>
+<div class="refsect2">
+<a name="id2856112"></a><h3>
+<a name="id1529972-bb"></a><code class="computeroutput">_byval</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> T<span class="special">&gt;</span> <span class="identifier">T</span> <a name="id1529977-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&amp;</span> t<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
+<div class="variablelist"><table border="0">
+<col align="left" valign="top">
+<tbody>
+<tr>
+<td><p><span class="term">Parameters:</span></p></td>
+<td><div class="variablelist"><table border="0">
+<col align="left" valign="top">
+<tbody><tr>
+<td><p><span class="term"><code class="computeroutput">t</code></span></p></td>
+<td><p>The object to unref </p></td>
+</tr></tbody>
+</table></div></td>
+</tr>
+<tr>
+<td><p><span class="term">Returns:</span></p></td>
+<td><p>
+ <code class="computeroutput">t</code>
+ </p></td>
+</tr>
+<tr>
+<td><p><span class="term">Throws:</span></p></td>
+<td>Will not throw.</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> T<span class="special">&gt;</span>
+ <span class="identifier">T</span> <a name="id1530033-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">reference_wrapper</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> t<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
+<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
+</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>
+</tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="_byref/result_This_T__id1529671.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.transform.arg_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="_byval/result_This_boost_refer_id1529876.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
+</div>
+</body>
+</html>