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<div class="refentry" title="Struct template noinvoke">
<a name="boost.proto.noinvoke"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template noinvoke</span></h2>
<p>boost::proto::noinvoke — A type annotation in an <a class="link" href="../../ObjectTransform.html" title="Concept ObjectTransform">ObjectTransform</a> which instructs
Proto not to look for a nested <code class="computeroutput">::type</code> within
<code class="computeroutput">T</code> after type substitution.</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.transform.make_hpp" title="Header <boost/proto/transform/make.hpp>">boost/proto/transform/make.hpp</a>>
</em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T>
<span class="bold"><strong>struct</strong></span> <a class="link" href="noinvoke.html" title="Struct template noinvoke">noinvoke</a> {
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1673969"></a><h2>Description</h2>
<p>
<a class="link" href="../../ObjectTransform.html" title="Concept ObjectTransform">ObjectTransform</a>s are evaluated by
<code class="computeroutput"><a class="link" href="make.html" title="Struct template make">proto::make<></a></code>,
which finds all nested transforms and replaces them with the result of their applications.
If any substitutions are performed, the result is first assumed to be a metafunction to be applied;
that is, Proto checks to see if the result has a nested <code class="computeroutput">::type</code>
typedef. If it does, that becomes the result. The purpose of <code class="computeroutput">proto::noinvoke<></code>
is to prevent Proto from looking for a nested <code class="computeroutput">::type</code> typedef
in these situations.
</p>
<p>
Example:
</p>
<pre class="programlisting">struct Test
: <a class="link" href="when.html" title="Struct template when">proto::when</a><
<a class="link" href="_.html" title="Struct _">_</a>
, proto::noinvoke<
// This remove_pointer invocation is bloked by noinvoke
boost::remove_pointer<
// This add_pointer invocation is *not* blocked by noinvoke
boost::add_pointer<<a class="link" href="_.html" title="Struct _">_</a>>
>
>()
>
{};
void test_noinvoke()
{
typedef <a class="link" href="terminal.html" title="Struct template terminal">proto::terminal</a><int>::type Int;
BOOST_MPL_ASSERT((
boost::is_same<
boost::result_of<Test(Int)>::type
, boost::remove_pointer<Int *>
>
));
Int i = {42};
boost::remove_pointer<Int *> t = Test()(i);
}</pre>
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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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