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<div class="refentry" title="Struct template as_child">
<a name="boost.proto.result_of.as_child"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template as_child</span></h2>
<p>boost::proto::result_of::as_child — A metafunction that computes the return type of the
<code class="computeroutput"><a class="link" href="../as_child_id1264710.html" title="Function as_child">proto::as_child()</a></code> function.</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="emphasis"><em>// In header: <<a class="link" href="../../../proto/reference.html#header.boost.proto.traits_hpp" title="Header <boost/proto/traits.hpp>">boost/proto/traits.hpp</a>>
</em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T, <span class="bold"><strong>typename</strong></span> Domain = <a class="link" href="../default_domain.html" title="Struct default_domain">proto::default_domain</a>>
<span class="bold"><strong>struct</strong></span> <a class="link" href="as_child.html" title="Struct template as_child">as_child</a> {
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> <em class="replaceable"><code>see-below</code></em> <a name="boost.proto.result_of.as_child.type"></a>type;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1642198"></a><h2>Description</h2>
<p>
The <code class="computeroutput">proto::result_of::as_child<></code> metafunction turns types into Proto types
if they are not already by making them Proto terminals held by reference. Types which are already Proto
types are left alone.
</p>
<p>
When <code class="computeroutput">T</code> is not yet a Proto type,
the result type <code class="computeroutput">proto::result_of::as_child<T, Domain>::type</code> is
<code class="computeroutput">boost::result_of<Domain(<a class="link" href="../expr.html" title="Struct template expr">proto::expr</a>< <a class="link" href="../tag/terminal.html" title="Struct terminal">proto::tag::terminal</a>, <a class="link" href="../term.html" title="Struct template term">proto::term</a><T &> >)>::type</code>.
</p>
<p>
When <code class="computeroutput">T</code> is already a Proto type
The result type <code class="computeroutput">proto::result_of::as_child<T, Domain>::type</code> is
<code class="computeroutput">T &</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>)
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