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| <h2><span class="refentrytitle">Macro BOOST_PROTO_BASIC_EXTENDS</span></h2> |
| <p>BOOST_PROTO_BASIC_EXTENDS — For creating expression wrappers that add members to a Proto expression template, like |
| <code class="computeroutput"><a class="link" href="boost/proto/extends.html" title="Struct template extends">proto::extends<></a></code>, |
| but while retaining POD-ness of the expression wrapper.</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="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>> |
| |
| </span>BOOST_PROTO_BASIC_EXTENDS(Expr, Derived, Domain)</pre></div> |
| <div class="refsect1"> |
| <a name="id2288224"></a><h2>Description</h2> |
| <p> |
| <code class="computeroutput">BOOST_PROTO_BASIC_EXTENDS()</code> adds the basic typedefs, member functions, and |
| data members necessary to make a struct a valid Proto expression extension. It does <span class="emphasis"><em>not</em></span> |
| add any constructors, virtual functions or access control blocks that would render the containing |
| struct non-POD. |
| </p> |
| <p> |
| <code class="computeroutput">Expr</code> is the Proto expression that the enclosing struct extends. |
| <code class="computeroutput">Derived</code> is the type of the enclosing struct. |
| <code class="computeroutput">Domain</code> is the Proto domain to which this expression extension belongs. |
| (See <code class="computeroutput"><a class="link" href="boost/proto/domain.html" title="Struct template domain">proto::domain<></a></code>.) |
| </p> |
| <p><code class="computeroutput">BOOST_PROTO_BASIC_EXTENDS()</code> adds to its enclosing struct |
| exactly one data member of type <code class="computeroutput">Expr</code>. |
| </p> |
| <p> |
| <span class="bold"><strong>Example:</strong></span></p> |
| <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> |
| <span class="keyword">struct</span> <span class="identifier">my_expr</span><span class="special">;</span> |
| |
| <span class="keyword">struct</span> <span class="identifier">my_domain</span> |
| <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> |
| <span class="special">{</span><span class="special">}</span><span class="special">;</span> |
| |
| <span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Expr</span> <span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">my_expr</span> |
| <span class="special">{</span> |
| <span class="comment">// OK, this makes my_expr<> a valid Proto expression extension.</span> |
| <span class="comment">// my_expr<> does /not/ have overloaded assignment, subscript,</span> |
| <span class="comment">// and function call operators that build expression templates, however.</span> |
| <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">my_expr</span><span class="special">,</span> <span class="identifier">my_domain</span><span class="special">)</span> |
| <span class="special">}</span><span class="special">;</span> |
| |
| <span class="comment">// OK, my_expr<> is POD, so this is statically initialized:</span> |
| <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> |
| <p> |
| </p> |
| <p> |
| See also: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_ASSIGN.html" title="Macro BOOST_PROTO_EXTENDS_ASSIGN">BOOST_PROTO_EXTENDS_ASSIGN</a>()</code></li> |
| <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_SUBSCRIPT.html" title="Macro BOOST_PROTO_EXTENDS_SUBSCRIPT">BOOST_PROTO_EXTENDS_SUBSCRIPT</a>()</code></li> |
| <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_FUNCTION.html" title="Macro BOOST_PROTO_EXTENDS_FUNCTION">BOOST_PROTO_EXTENDS_FUNCTION</a>()</code></li> |
| <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a>()</code></li> |
| </ul></div> |
| <p> |
| </p> |
| </div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <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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