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| <a name="boost.proto.result_of.make_expr_Tag,_Domain,__id1265249"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct template make_expr<Tag, Domain, A...></span></h2> |
| <p>boost::proto::result_of::make_expr<Tag, Domain, A...> — Metafunction that computes the return type of the |
| <code class="computeroutput"><a class="link" href="../make_expr_id1265715.html" title="Function make_expr">proto::make_expr()</a></code> |
| function, within the specified domain.</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: <<a class="link" href="../../../proto/reference.html#header.boost.proto.make_expr_hpp" title="Header <boost/proto/make_expr.hpp>">boost/proto/make_expr.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Tag<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../../Domain.html" title="Concept Domain">Domain</a><span class="special">,</span> <span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="make_expr_Tag__Domain___id1265249.html" title="Struct template make_expr<Tag, Domain, A...>">make_expr</a><span class="special"><</span><span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">,</span> <span class="identifier">A</span><span class="special">...</span><span class="special">></span> <span class="special">{</span> |
| <span class="comment">// <a class="link" href="make_expr_Tag__Domain___id1265249.html#boost.proto.result_of.make_expr_Tag,_Domain,__id1265249types">types</a></span> |
| <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="make_expr_Tag__Domain___id1265249.html#boost.proto.result_of.make_expr_Tag,_Domain,__id1265249.type"><span class="identifier">type</span></a><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id2304251"></a><h2>Description</h2> |
| <p> |
| Computes the return type of the |
| <code class="computeroutput"><a class="link" href="../make_expr_id1265715.html" title="Function make_expr">proto::make_expr()</a></code> |
| function. |
| </p> |
| <div class="refsect2"> |
| <a name="id2304271"></a><h3> |
| <a name="boost.proto.result_of.make_expr_Tag,_Domain,__id1265249types"></a><code class="computeroutput">make_expr</code> |
| public |
| types</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <p> |
| <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 name="boost.proto.result_of.make_expr_Tag,_Domain,__id1265249.type"></a><span class="identifier">type</span><span class="special">;</span></p> |
| <p> |
| Let <code class="computeroutput"><em class="replaceable"><code>WRAP<X></code></em></code> be defined such that: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p> |
| If <code class="computeroutput">X</code> is <code class="computeroutput">Y &</code> |
| or (possibly cv-qualified) <code class="computeroutput">boost::reference_wrapper<Y></code>, |
| then <code class="computeroutput"><em class="replaceable"><code>WRAP<X></code></em></code> is equivalent to |
| <code class="computeroutput"><a class="link" href="as_child.html" title="Struct template as_child">proto::result_of::as_child</a><Y, Domain></code>. |
| </p></li> |
| <li class="listitem"><p> |
| Otherwise, <code class="computeroutput"><em class="replaceable"><code>WRAP<X></code></em></code> is equivalent to |
| <code class="computeroutput"><a class="link" href="as_expr.html" title="Struct template as_expr">proto::result_of::as_expr</a><X, Domain></code>. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p> |
| If <code class="computeroutput"><a class="link" href="../wants_basic_expr.html" title="Struct template wants_basic_expr">proto::wants_basic_expr</a><typename Domain::proto_generator>::value</code> |
| is true, then let <code class="computeroutput"><em class="replaceable"><code>E</code></em></code> be |
| <code class="computeroutput"><a class="link" href="../basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a></code>; otherwise, |
| let <code class="computeroutput"><em class="replaceable"><code>E</code></em></code> be |
| <code class="computeroutput"><a class="link" href="../expr.html" title="Struct template expr">proto::expr</a></code>. |
| </p> |
| <p> |
| If <code class="computeroutput">Tag</code> is |
| <code class="computeroutput"><a class="link" href="../tag/terminal.html" title="Struct terminal">proto::tag::terminal</a></code>, then |
| <code class="computeroutput">type</code> is a typedef for |
| <code class="computeroutput">typename <em class="replaceable"><code>WRAP<A<sub>0</sub>></code></em>::type</code>. |
| </p> |
| <p> |
| Otherwise, <code class="computeroutput">type</code> is a typedef for |
| <code class="computeroutput">boost::result_of<Domain(<em class="replaceable"><code>E</code></em>< |
| Tag, <a class="link" href="../listN.html" title="Struct template listN">proto::listN</a>< |
| typename <em class="replaceable"><code>WRAP<A></code></em>::type...> >)>::type</code> |
| </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 © 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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