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<div class="refentry">
<a name="boost.proto.pass_through.impl"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template impl</span></h2>
<p>boost::proto::pass_through::impl</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.pass_through_hpp" title="Header &lt;boost/proto/transform/pass_through.hpp&gt;">boost/proto/transform/pass_through.hpp</a>&gt;

</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">,</span> <span class="keyword">typename</span> State<span class="special">,</span> <span class="keyword">typename</span> Data<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a>&lt;Expr, State, Data&gt; <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">child_c</span><span class="special">&lt;</span><span class="identifier">Grammar</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>       <a name="boost.proto.pass_through.impl.GN"></a><span class="identifier">GN</span><span class="special">;</span>           <span class="comment">// For each N in [0,Expr arity), for exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">child_c</span><span class="special">&lt;</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>          <a name="boost.proto.pass_through.impl.EN"></a><span class="identifier">EN</span><span class="special">;</span>           <span class="comment">// For each N in [0,Expr arity), for exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">&lt;</span><span class="identifier">GN</span><span class="special">(</span><span class="identifier">EN</span><span class="special">,</span><span class="identifier">State</span><span class="special">,</span><span class="identifier">Data</span><span class="special">)</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>         <a name="boost.proto.pass_through.impl.RN"></a><span class="identifier">RN</span><span class="special">;</span>           <span class="comment">// For each N in [0,Expr arity), for exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">::</span><span class="identifier">proto_tag</span>                                   <a name="boost.proto.pass_through.impl.T"></a><span class="identifier">T</span><span class="special">;</span>            <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">Domain</span><span class="special">,</span> <a class="link" href="../deduce_domain.html" title="Struct deduce_domain">deduce_domain</a><span class="special">&gt;</span>                      <a name="boost.proto.pass_through.impl.Deduce"></a><span class="identifier">Deduce</span><span class="special">;</span>       <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">::</span><span class="identifier">proto_domain</span>                                <a name="boost.proto.pass_through.impl.DD"></a><span class="identifier">DD</span><span class="special">;</span>           <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span><span class="identifier">Deduce</span><span class="special">,</span> <span class="identifier">DD</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>                <a name="boost.proto.pass_through.impl.D"></a><span class="identifier">D</span><span class="special">;</span>            <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">D</span><span class="special">::</span><span class="identifier">proto_generator</span>                                <a name="boost.proto.pass_through.impl.G"></a><span class="identifier">G</span><span class="special">;</span>            <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <a class="link" href="../listN.html" title="Struct template listN">proto::listN</a><span class="special">&lt;</span><span class="identifier">R0</span><span class="special">,</span><span class="special">...</span><span class="identifier">RN</span><span class="special">&gt;</span>                                     <a name="boost.proto.pass_through.impl.A"></a><span class="identifier">A</span><span class="special">;</span>            <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <a class="link" href="../expr.html" title="Struct template expr">proto::expr</a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;</span>                                          <a name="boost.proto.pass_through.impl.E"></a><span class="identifier">E</span><span class="special">;</span>            <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <a class="link" href="../basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;</span>                                    <a name="boost.proto.pass_through.impl.BE"></a><span class="identifier">BE</span><span class="special">;</span>           <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span><a class="link" href="../wants_basic_expr.html" title="Struct template wants_basic_expr">proto::wants_basic_expr</a><span class="special">&lt;</span><span class="identifier">G</span><span class="special">&gt;</span><span class="special">,</span> <span class="identifier">BE</span><span class="special">,</span> <span class="identifier">E</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.pass_through.impl.expr_type"></a><span class="identifier">expr_type</span><span class="special">;</span>    <span class="comment">// For exposition only</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">&lt;</span><span class="identifier">D</span><span class="special">(</span><span class="identifier">expr_type</span><span class="special">)</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>              <a name="boost.proto.pass_through.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="impl.html#idm45506983757088-bb">public member functions</a></span>
  <span class="identifier">result_type</span> <a class="link" href="impl.html#idm45506983756528-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span> 
                         <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 
                         <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</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="idm45555169833424"></a><h2>Description</h2>
<div class="refsect2">
<a name="idm45555169833008"></a><h3>
<a name="idm45506983757088-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idm45506983756528-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span> expr<span class="special">,</span> 
                       <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span> state<span class="special">,</span> 
                       <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span> data<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">Requires:</span></p></td>
<td><p>
                  <code class="computeroutput">
                    <a class="link" href="../matches.html" title="Struct template matches">proto::matches</a>&lt;Expr, Grammar&gt;::value
                  </code> is <code class="computeroutput">true</code>.
                </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>
<p>
                  </p>
<pre class="programlisting"><span class="identifier">D</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">expr_type</span><span class="special">::</span><span class="identifier">make</span><span class="special">(</span>
  <span class="identifier">G0</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><a class="link" href="../child_c_idm45506990932896.html" title="Function child_c">proto::child_c</a><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;</span><span class="special">(</span><span class="identifier">expr</span><span class="special">)</span><span class="special">,</span> <span class="identifier">state</span><span class="special">,</span> <span class="identifier">data</span><span class="special">)</span><span class="special">,</span>
  <span class="special">...</span>
  <span class="identifier">GN</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><a class="link" href="../child_c_idm45506990932896.html" title="Function child_c">proto::child_c</a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;</span><span class="special">(</span><span class="identifier">expr</span><span class="special">)</span><span class="special">,</span> <span class="identifier">state</span><span class="special">,</span> <span class="identifier">data</span><span class="special">)</span>
<span class="special">)</span><span class="special">)</span></pre>
<p>
                </p>
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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>)
      </p>
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