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<h2><span class="refentrytitle">Struct callable</span></h2>
<p>boost::proto::callable — Base class for callable <a class="link" href="../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>s</p>
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<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.proto_fwd_hpp" title="Header <boost/proto/proto_fwd.hpp>">boost/proto/proto_fwd.hpp</a>>
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<span class="keyword">struct</span> <a class="link" href="callable.html" title="Struct callable">callable</a> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2839390"></a><h2>Description</h2>
<p>
When defining a callable <a class="link" href="../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>, inherit
from <code class="computeroutput">proto::callable</code> so that it can be used to create
a <a class="link" href="../../CallableTransform.html" title="Concept CallableTransform">CallableTransform</a>.
</p>
<p>
<code class="computeroutput"><a class="link" href="is_callable.html" title="Struct template is_callable">proto::is_callable</a><T>::value</code> is
<code class="computeroutput">true</code> for types that inherit from
<code class="computeroutput">proto::callable</code>.
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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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