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<h2><span class="refentrytitle">Macro BOOST_INTRUSIVE_OPTION_CONSTANT</span></h2>
<p>BOOST_INTRUSIVE_OPTION_CONSTANT</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="intrusive/reference.html#header.boost.intrusive.pack_options_hpp" title="Header <boost/intrusive/pack_options.hpp>">boost/intrusive/pack_options.hpp</a>>
</span>BOOST_INTRUSIVE_OPTION_CONSTANT(OPTION_NAME, TYPE, VALUE, CONSTANT_NAME)</pre></div>
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<a name="idp301969136"></a><h2>Description</h2>
<p>Defines an option class of name OPTION_NAME that can be used to specify a constant of type TYPE with value VALUE...</p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">OPTION_NAME</span><span class="special"><</span><span class="identifier">TYPE</span> <span class="identifier">VALUE</span><span class="special">></span>
<span class="special">{</span> <span class="identifier">unspecified_content</span> <span class="special">}</span><span class="special">;</span>
</pre>
<p>...that after being combined with <code class="computeroutput"><a class="link" href="boost/intrusive/pack_options.html" title="Struct template pack_options">boost::intrusive::pack_options</a></code>, will contain a CONSTANT_NAME static constant of value VALUE. Example:</p>
<pre class="programlisting"><span class="comment">//[includes and namespaces omitted for brevity]</span>
<span class="comment">//This macro will create the following class:</span>
<span class="comment">// template<bool Enabled></span>
<span class="comment">// struct incremental</span>
<span class="comment">// { unspecified_content };</span>
<span class="identifier">BOOST_INTRUSIVE_OPTION_CONSTANT</span><span class="special">(</span><span class="identifier">incremental</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">,</span> <span class="identifier">Enabled</span><span class="special">,</span> <span class="identifier">is_incremental</span><span class="special">)</span>
<span class="keyword">struct</span> <span class="identifier">empty_default</span><span class="special">{</span><span class="special">}</span><span class="special">;</span>
<span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">is_incremental</span> <span class="special">=</span> <span class="identifier">pack_options</span><span class="special"><</span> <span class="identifier">empty_default</span><span class="special">,</span> <span class="identifier">incremental</span><span class="special"><</span><span class="keyword">true</span><span class="special">></span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">::</span><span class="identifier">is_incremental</span><span class="special">;</span>
<span class="identifier">BOOST_STATIC_ASSERT</span><span class="special">(</span><span class="special">(</span> <span class="identifier">is_incremental</span> <span class="special">==</span> <span class="keyword">true</span> <span class="special">)</span><span class="special">)</span><span class="special">;</span>
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