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  27 <a name="boost.proto.nary_expr"></a><div class="titlepage"></div>
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  29 <h2><span class="refentrytitle">Struct template nary_expr</span></h2>
  30 <p>boost::proto::nary_expr &#8212; A metafunction for generating n-ary expression types with a specified tag type,
  31           a grammar element for matching n-ary expressions, and
  32           a <a class="link" href="../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>
  33           that dispatches to the
  34           <code class="computeroutput"><a class="link" href="pass_through.html" title="Struct template pass_through">proto::pass_through&lt;&gt;</a></code>
  35           transform.</p>
  36 </div>
  37 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  38 <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.traits_hpp" title="Header &lt;boost/proto/traits.hpp&gt;">boost/proto/traits.hpp</a>&gt;
  39
  40 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Tag<span class="special">,</span> <span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span>
  41 <span class="keyword">struct</span> <a class="link" href="nary_expr.html" title="Struct template nary_expr">nary_expr</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">nary_expr</span><span class="special">&lt;</span><span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">A</span><span class="special">...</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">{</span>
  42   <span class="comment">// types</span>
  43   <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">Tag</span><span class="special">,</span> <a class="link" href="listN.html" title="Struct template listN">proto::listN</a><span class="special">&lt;</span> <span class="identifier">A</span><span class="special">...</span> <span class="special">&gt;</span> <span class="special">&gt;</span>       <a name="boost.proto.nary_expr.type"></a><span class="identifier">type</span><span class="special">;</span>
  44   <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">Tag</span><span class="special">,</span> <a class="link" href="listN.html" title="Struct template listN">proto::listN</a><span class="special">&lt;</span> <span class="identifier">A</span><span class="special">...</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.proto.nary_expr.proto_grammar"></a><span class="identifier">proto_grammar</span><span class="special">;</span>
  45
  46   <span class="comment">// member classes/structs/unions</span>
  47   <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>
  48   <span class="keyword">struct</span> <a class="link" href="nary_expr/impl.html" title="Struct template impl">impl</a> <span class="special">:</span>
  49     <span class="keyword"></span> <a class="link" href="pass_through.html" title="Struct template pass_through">proto::pass_through</a>&lt;nary_expr&gt;::template impl&lt;Expr, State, Data&gt;
  50   <span class="special">{</span>
  51   <span class="special">}</span><span class="special">;</span>
  52 <span class="special">}</span><span class="special">;</span></pre></div>
  53 <div class="refsect1">
  54 <a name="idp478338960"></a><h2>Description</h2>
  55 <p>
  56             Use <code class="computeroutput">proto::nary_expr&lt;<a class="link" href="_.html" title="Struct _">proto::_</a>, <a class="link" href="vararg.html" title="Struct template vararg">proto::vararg</a>&lt;<a class="link" href="_.html" title="Struct _">proto::_</a>&gt; &gt;</code>
  57             as a grammar element to match any n-ary expression; that is, any non-terminal.
  58           </p>
  59 </div>
  60 </div>
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  62 <td align="left"></td>
  63 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
  64         Distributed under the Boost Software License, Version 1.0. (See accompanying
  65         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>)
  66       </p>
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