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| <a name="boost.proto.result_of.make_expr"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct template make_expr</span></h2> |
| <p>boost::proto::result_of::make_expr — Metafunction that computes the return type of the |
| <code class="computeroutput"><a class="link" href="../make_expr_id1362445.html" title="Function make_expr">proto::make_expr()</a></code> |
| function, with a domain deduced from the domains of the children.</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><span class="special">...</span> A<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="make_expr.html" title="Struct template make_expr">make_expr</a> <span class="special">{</span> |
| <span class="comment">// <a class="link" href="make_expr.html#boost.proto.result_of.make_exprtypes">types</a></span> |
| <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">domain</span><span class="special">-</span><span class="identifier">deduced</span><span class="special">-</span><span class="identifier">from</span><span class="special">-</span><span class="identifier">child</span><span class="special">-</span><span class="identifier">types</span></code></em> <a class="link" href="make_expr.html#boost.proto.result_of.make_expr.D"><span class="identifier">D</span></a><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="make_expr.html" title="Struct template make_expr">proto::result_of::make_expr</a><span class="special"><</span><span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">D</span><span class="special">,</span> <span class="identifier">A</span><span class="special">...</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.result_of.make_expr.type"></a><span class="identifier">type</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id2467613"></a><h2>Description</h2> |
| <p> |
| Computes the return type of the |
| <code class="computeroutput"><a class="link" href="../make_expr_id1362445.html" title="Function make_expr">proto::make_expr()</a></code> function. |
| </p> |
| <p> |
| In this specialization, the domain is deduced from the domains of the child types. |
| If <code class="computeroutput"><a class="link" href="../is_domain.html" title="Struct template is_domain">proto::is_domain</a><A<sub>0</sub>>::value</code> |
| is <code class="computeroutput">true</code>, then another specialization is selected. |
| </p> |
| <div class="refsect2"> |
| <a name="id2467661"></a><h3> |
| <a name="boost.proto.result_of.make_exprtypes"></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> <em class="replaceable"><code><span class="identifier">domain</span><span class="special">-</span><span class="identifier">deduced</span><span class="special">-</span><span class="identifier">from</span><span class="special">-</span><span class="identifier">child</span><span class="special">-</span><span class="identifier">types</span></code></em> <a name="boost.proto.result_of.make_expr.D"></a><span class="identifier">D</span><span class="special">;</span></p> |
| <p> |
| In this specialization, Proto uses the domains of the child expressions to compute the |
| domain of the parent. See |
| <code class="computeroutput"><a class="link" href="../deduce_domain.html" title="Struct deduce_domain">proto::deduce_domain</a></code> for a full |
| description of the procedure used. |
| </p> |
| </li></ol></div> |
| </div> |
| </div> |
| </div> |
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| <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>) |
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