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<title>Struct _expr</title>
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<div class="refentry" title="Struct _expr">
<a name="boost.proto._expr"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct _expr</span></h2>
<p>boost::proto::_expr — A <a class="link" href="../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> that returns the current expression unmodified. </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="emphasis"><em>// In header: <<a class="link" href="../../proto/reference.html#header.boost.proto.transform.arg_hpp" title="Header <boost/proto/transform/arg.hpp>">boost/proto/transform/arg.hpp</a>>
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<span class="bold"><strong>struct</strong></span> <a class="link" href="_expr.html" title="Struct _expr">_expr</a> : <span class="bold"><strong></strong></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a>< _expr > {
<span class="emphasis"><em>// member classes/structs/unions</em></span>
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Expr, <span class="bold"><strong>typename</strong></span> State, <span class="bold"><strong>typename</strong></span> Data>
<span class="bold"><strong>struct</strong></span> <a class="link" href="_expr/impl.html" title="Struct template impl">impl</a> : <span class="bold"><strong></strong></span> <a class="link" href="transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a>< Expr, State, Data > {
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> Expr <a class="link" href="_expr/impl.html#boost.proto._expr.impl.result_type">result_type</a>;
<span class="emphasis"><em>// <a class="link" href="_expr/impl.html#id1265785-bb">public member functions</a></em></span>
<span class="type">Expr</span> <a class="link" href="_expr/impl.html#id1265790-bb"><span class="bold"><strong>operator</strong></span>()</a>(<span class="bold"><strong>typename</strong></span> impl::expr_param, <span class="bold"><strong>typename</strong></span> impl::state_param,
<span class="bold"><strong>typename</strong></span> impl::data_param) <span class="bold"><strong>const</strong></span>;
};
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1662349"></a><h2>Description</h2>
<p>
Example:
</p>
<pre class="programlisting"><a class="link" href="terminal.html" title="Struct template terminal">proto::terminal</a><int>::type i = {42};
<a class="link" href="terminal.html" title="Struct template terminal">proto::terminal</a><int>::type & j = proto::_expr()(i);
assert( boost::addressof(i) == boost::addressof(j) );</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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