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<a name="BOOST_PROTO_EXTENDS"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Macro BOOST_PROTO_EXTENDS</span></h2>
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<p>BOOST_PROTO_EXTENDS — For creating expression wrappers that add behaviors to a Proto expression template, like
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<code class="computeroutput"><a class="link" href="boost/proto/extends.html" title="Struct template extends">proto::extends<></a></code>,
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but while retaining POD-ness of the expression wrapper.</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
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<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.extends_hpp" title="Header <boost/proto/extends.hpp>">boost/proto/extends.hpp</a>>
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</span>BOOST_PROTO_EXTENDS(Expr, Derived, Domain)</pre></div>
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<div class="refsect1">
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<a name="id-1.3.34.5.12.7.4"></a><h2>Description</h2>
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<p>
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Equivalent to:
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</p>
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<pre class="programlisting"><a class="link" href="BOOST_PROTO_BASIC_EXTENDS.html" title="Macro BOOST_PROTO_BASIC_EXTENDS">BOOST_PROTO_BASIC_EXTENDS</a><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Derived</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">)</span>
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<a class="link" href="BOOST_PROTO_EXTENDS_ASSIGN.html" title="Macro BOOST_PROTO_EXTENDS_ASSIGN">BOOST_PROTO_EXTENDS_ASSIGN</a><span class="special">(</span><span class="special">)</span>
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<a class="link" href="BOOST_PROTO__1_3_34_5_10_7.html" title="Macro BOOST_PROTO_EXTENDS_SUBSCRIPT">BOOST_PROTO_EXTENDS_SUBSCRIPT</a><span class="special">(</span><span class="special">)</span>
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<a class="link" href="BOOST_PROTO__1_3_34_5_10_6.html" title="Macro BOOST_PROTO_EXTENDS_FUNCTION">BOOST_PROTO_EXTENDS_FUNCTION</a><span class="special">(</span><span class="special">)</span></pre>
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<p>
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</p>
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<p>If the <code class="computeroutput">Domain</code> parameter is dependent, you can specify it as
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<code class="computeroutput">typename Domain</code>, as in
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<code class="computeroutput">BOOST_PROTO_EXTENDS(Expr, Derived, typename Domain)</code>
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</p>
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<p>
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<span class="bold"><strong>Example:</strong></span></p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Expr</span> <span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">my_expr</span><span class="special">;</span>
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<span class="keyword">struct</span> <span class="identifier">my_domain</span>
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<span class="special">:</span> <a class="link" href="boost/proto/domain.html" title="Struct template domain">proto::domain</a><span class="special"><</span> <a class="link" href="boost/proto/pod_generator.html" title="Struct template pod_generator">proto::pod_generator</a><span class="special"><</span> <span class="identifier">my_expr</span> <span class="special">></span> <span class="special">></span>
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<span class="special">{</span><span class="special">}</span><span class="special">;</span>
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<span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Expr</span> <span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">my_expr</span>
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<span class="special">{</span>
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<span class="comment">// OK, this makes my_expr<> a valid Proto expression extension.</span>
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<span class="comment">// my_expr<> has overloaded assignment, subscript,</span>
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<span class="comment">// and function call operators that build expression templates.</span>
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<a class="link" href="BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">my_expr</span><span class="special">,</span> <span class="identifier">my_domain</span><span class="special">)</span>
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<span class="special">}</span><span class="special">;</span>
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<span class="comment">// OK, my_expr<> is POD, so this is statically initialized:</span>
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<span class="identifier">my_expr</span><span class="special"><</span> <a class="link" href="boost/proto/terminal.html" title="Struct template terminal">proto::terminal</a><span class="special"><</span><span class="keyword">int</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="special">></span> <span class="keyword">const</span> <span class="identifier">_1</span> <span class="special">=</span> <span class="special">{</span><span class="special">{</span><span class="number">1</span><span class="special">}</span><span class="special">}</span><span class="special">;</span></pre>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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