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<title>Struct template make_expr<Tag, Domain, A...></title>
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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_exp_idm45506975053600.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_exp_idm45506975105632.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_exp_idm45506975105632.html#boost.proto.result_of.make_exp_idm45506975105632types">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_exp_idm45506975105632.html#boost.proto.result_of.make_exp_idm45506975105632.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="idm45555186298112"></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>
<div class="refsect2">
<a name="idm45555186295824"></a><h3>
<a name="boost.proto.result_of.make_exp_idm45506975105632types"></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_exp_idm45506975105632.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" style="list-style-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>
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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>)
</p>
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