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<title>Struct by_value_generator</title>
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<div class="refentry" title="Struct by_value_generator">
<a name="boost.proto.by_value_generator"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct by_value_generator</span></h2>
<p>boost::proto::by_value_generator &#8212; A generator that replaces child nodes held by reference with ones held by value.
          Use with <code class="computeroutput"><a class="link" href="compose_generators.html" title="Struct template compose_generators">proto::compose_generators&lt;&gt;</a>
          </code> to forward that result to another generator.
        </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="emphasis"><em>// In header: &lt;<a class="link" href="../../proto/reference.html#header.boost.proto.generate_hpp" title="Header &lt;boost/proto/generate.hpp&gt;">boost/proto/generate.hpp</a>&gt;

</em></span>
<span class="bold"><strong>struct</strong></span> <a class="link" href="by_value_generator.html" title="Struct by_value_generator">by_value_generator</a> : <span class="bold"><strong></strong></span> <span class="type"><a class="link" href="callable.html" title="Struct callable">proto::callable</a></span> {
  <span class="emphasis"><em>// member classes/structs/unions</em></span>
  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> This, <span class="bold"><strong>typename</strong></span> Expr&gt; 
  <span class="bold"><strong>struct</strong></span> <a class="link" href="by_value_generator/result_This_Expr__id1239958.html" title="Struct template result&lt;This(Expr)&gt;">result</a>&lt;This(Expr)&gt; {
    <span class="emphasis"><em>// types</em></span>
    <span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>unspecified</em></span> <a class="link" href="by_value_generator/result_This_Expr__id1239958.html#boost.proto.by_value_generator.result_This(Expr)_id1239958.type">type</a>;
  };

  <span class="emphasis"><em>// <a class="link" href="by_value_generator.html#id1239995-bb">public member functions</a></em></span>
  <span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Expr&gt; <span class="type"><span class="emphasis"><em>unspecified</em></span></span> <a class="link" href="by_value_generator.html#id1240000-bb"><span class="bold"><strong>operator</strong></span>()</a>(Expr <span class="bold"><strong>const</strong></span> &amp;) <span class="bold"><strong>const</strong></span>;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1592021"></a><h2>Description</h2>
<p>
            Generators are intended for use as the first template parameter to the
            <code class="computeroutput"><a class="link" href="domain.html" title="Struct template domain">proto::domain&lt;&gt;</a></code>
            class template and control if and how expressions within that domain are to be customized.
            <code class="computeroutput">proto::by_value_generator</code> ensures all child nodes are held
            by value. This generator is typically composed with a second generator for further processing,
            as <code class="computeroutput"><a class="link" href="compose_generators.html" title="Struct template compose_generators">proto::compose_generators</a>&lt;proto::by_value_generator,
            MyGenerator&gt;</code>.
          </p>
<div class="refsect2" title="by_value_generator public member functions">
<a name="id1592066"></a><h3>
<a name="id1239995-bb"></a><code class="computeroutput">by_value_generator</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Expr&gt; <span class="type"><span class="emphasis"><em>unspecified</em></span></span> <a name="id1240000-bb"></a><span class="bold"><strong>operator</strong></span>()(Expr <span class="bold"><strong>const</strong></span> &amp; expr) <span class="bold"><strong>const</strong></span>;</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<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">expr</code></span></p></td>
<td><p>A Proto expression.</p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>Equivalent to <code class="computeroutput"><a class="link" href="deep_copy_id1235315.html" title="Function template deep_copy">proto::deep_copy</a>(expr)</code></p></td>
</tr>
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<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>)
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