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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_exp_idm45506975053600.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="idm45555186341264"></a><h2>Description</h2>
<p>
Computes the return type of the
<code class="computeroutput"><a class="link" href="../make_exp_idm45506975053600.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="idm45555186335968"></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>
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<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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