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  25 <div class="refentry">
  26 <a name="boost.proto._default"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Struct template _default</span></h2>
  29 <p>boost::proto::_default &#8212; A <a class="link" href="../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> that gives expressions their
  30           usual C++ behavior</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <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.default_hpp" title="Header &lt;boost/proto/transform/default.hpp&gt;">boost/proto/transform/default.hpp</a>&gt;
  34
  35 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Grammar <span class="special">=</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em><span class="special">&gt;</span>
  36 <span class="keyword">struct</span> <a class="link" href="_default.html" title="Struct template _default">_default</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a><span class="special">&lt;</span> <span class="identifier">_default</span><span class="special">&lt;</span><span class="identifier">Grammar</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">{</span>
  37   <span class="comment">// member classes/structs/unions</span>
  38   <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>
  39   <span class="keyword">struct</span> <a class="link" href="_default/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>
  40     <span class="comment">// <a class="link" href="_default/impl.html#boost.proto._default.impltypes">types</a></span>
  41     <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">::</span><span class="identifier">tag_type</span> <a class="link" href="_default/impl.html#boost.proto._default.impl.Tag"><span class="identifier">Tag</span></a><span class="special">;</span>          <span class="comment">// For exposition only</span>
  42     <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></em></span>               <a class="link" href="_default/impl.html#boost.proto._default.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>
  43
  44     <span class="comment">// <a class="link" href="_default/impl.html#idp206809760-bb">public member functions</a></span>
  45     <span class="identifier">result_type</span> <a class="link" href="_default/impl.html#idp206810320-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>
  46                            <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  47                            <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>
  48
  49     <span class="comment">// public data members</span>
  50     <span class="keyword">static</span> <span class="identifier">Expr</span> <span class="identifier">s_expr</span><span class="special">;</span>    <span class="comment">// For exposition only</span>
  51     <span class="keyword">static</span> <span class="identifier">State</span> <span class="identifier">s_state</span><span class="special">;</span>    <span class="comment">// For exposition only</span>
  52     <span class="keyword">static</span> <span class="identifier">Data</span> <span class="identifier">s_data</span><span class="special">;</span>    <span class="comment">// For exposition only</span>
  53   <span class="special">}</span><span class="special">;</span>
  54 <span class="special">}</span><span class="special">;</span></pre></div>
  55 <div class="refsect1">
  56 <a name="idp387829088"></a><h2>Description</h2>
  57 <p>
  58             For the complete description of the behavior of the <code class="computeroutput">proto::_default</code>
  59             transform, see the documentation for the nested <code class="computeroutput">
  60               <a class="link" href="_default/impl.html" title="Struct template impl">proto::_default::impl&lt;&gt;</a>
  61             </code> class template.
  62           </p>
  63 <p>
  64             When used without specifying a <code class="computeroutput">Grammar</code> parameter,
  65             <code class="computeroutput">proto::_default</code> behaves as if the parameter were
  66             <code class="computeroutput">proto::_default&lt;&gt;</code>.
  67           </p>
  68 </div>
  69 </div>
  70 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  71 <td align="left"></td>
  72 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
  73         Distributed under the Boost Software License, Version 1.0. (See accompanying
  74         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>)
  75       </p>
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