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<h2><span class="refentrytitle">Macro BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span></h2>
<p>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST — Macro used to make a class compatible with boost::typeindex::runtime_cast without including support for boost::typeindex::type_id_runtime. </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="boost_typeindex_header_reference.html#header.boost.type_index.runtime_cast.register_runtime_class_hpp" title="Header <boost/type_index/runtime_cast/register_runtime_class.hpp>">boost/type_index/runtime_cast/register_runtime_class.hpp</a>>
</span>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST(base_class_seq)</pre></div>
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<a name="idp571074048"></a><h2>Description</h2>
<p>BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST is provided as an alternative to BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS in the event that support for boost::typeindex::type_id_runtime is undesirable.</p>
<p><span class="bold"><strong>Example:</strong></span> </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">base1</span> <span class="special">{</span>
<span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="identifier">BOOST_TYPE_INDEX_NO_BASE_CLASS</span><span class="special">)</span>
<span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">base1</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="keyword">struct</span> <span class="identifier">base2</span> <span class="special">{</span>
<span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="identifier">BOOST_TYPE_INDEX_NO_BASE_CLASS</span><span class="special">)</span>
<span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">base2</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="keyword">struct</span> <span class="identifier">derived1</span> <span class="special">:</span> <span class="identifier">base1</span> <span class="special">{</span>
<span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="special">(</span><span class="identifier">base1</span><span class="special">)</span><span class="special">)</span>
<span class="special">}</span><span class="special">;</span>
<span class="keyword">struct</span> <span class="identifier">derived2</span> <span class="special">:</span> <span class="identifier">base1</span><span class="special">,</span> <span class="identifier">base2</span> <span class="special">{</span>
<span class="identifier">BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST</span><span class="special">(</span><span class="special">(</span><span class="identifier">base1</span><span class="special">)</span><span class="special">(</span><span class="identifier">base2</span><span class="special">)</span><span class="special">)</span>
<span class="special">}</span><span class="special">;</span>
<span class="special">...</span>
<span class="identifier">base1</span><span class="special">*</span> <span class="identifier">pb1</span> <span class="special">=</span> <span class="identifier">get_object</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">if</span><span class="special">(</span><span class="identifier">derived2</span><span class="special">*</span> <span class="identifier">pb2</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">typeindex</span><span class="special">::</span><span class="identifier">runtime_cast</span><span class="special"><</span><span class="identifier">derived2</span><span class="special">*</span><span class="special">></span><span class="special">(</span><span class="identifier">pb1</span><span class="special">)</span><span class="special">)</span>
<span class="special">{</span> <span class="comment">/* can't call boost::typeindex::type_id_runtime(*pb1) here */</span> <span class="special">}</span>
</pre>
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<td><p><span class="term">Parameters:</span></p></td>
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<td><p><span class="term"><code class="computeroutput">base_class_seq</code></span></p></td>
<td><p>A Boost.Preprocessor sequence of the current class' direct bases, or BOOST_TYPE_INDEX_NO_BASE_CLASS if this class has no direct base classes. </p></td>
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<td align="right"><div class="copyright-footer">Copyright © 2012-2016 Antony Polukhin<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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