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| <h2><span class="refentrytitle">Struct template pack_options</span></h2> |
| <p>boost::intrusive::pack_options</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><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> DefaultOptions<span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> Options<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="pack_options.html" title="Struct template pack_options">pack_options</a> <span class="special">{</span> |
| <span class="comment">// types</span> |
| <span class="keyword">typedef</span> <span class="identifier">unspecified_type</span> <a name="boost.intrusive.pack_options.type"></a><span class="identifier">type</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp280279216"></a><h2>Description</h2> |
| <p>This class is a utility that takes:</p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"><p>a default options class defining initial static constant and typedefs</p></li> |
| <li class="listitem"><p>several options defined with BOOST_INTRUSIVE_OPTION_CONSTANT and BOOST_INTRUSIVE_OPTION_TYPE</p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p>and packs them together in a new type that defines all options as member typedefs or static constant values. Given options of form:</p> |
| <pre class="programlisting"><span class="identifier">BOOST_INTRUSIVE_OPTION_TYPE</span><span class="special">(</span><span class="identifier">my_pointer</span><span class="special">,</span> <span class="identifier">VoidPointer</span><span class="special">,</span> <span class="identifier">VoidPointer</span><span class="special">,</span> <span class="identifier">my_pointer_type</span><span class="special">)</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> |
| </pre> |
| <p>the following expression</p> |
| <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">default_options</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="keyword">long</span> <span class="identifier">int_type</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">int_constant</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> |
| |
| <span class="identifier">pack_options</span><span class="special"><</span> <span class="identifier">default_options</span><span class="special">,</span> <span class="identifier">my_pointer</span><span class="special"><</span><span class="keyword">void</span><span class="special">*</span><span class="special">></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> |
| </pre> |
| <p>will create a type that will contain the following typedefs/constants</p> |
| <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">unspecified_type</span> |
| <span class="special">{</span> |
| <span class="comment">//Default options</span> |
| <span class="keyword">typedef</span> <span class="keyword">long</span> <span class="identifier">int_type</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">int_constant</span> <span class="special">=</span> <span class="special">-</span><span class="number">1</span><span class="special">;</span> |
| |
| <span class="comment">//Packed options (will ovewrite any default option)</span> |
| <span class="keyword">typedef</span> <span class="keyword">void</span><span class="special">*</span> <span class="identifier">my_pointer_type</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</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> |
| </pre> |
| <p>If an option is specified in the default options argument and later redefined as an option, the last definition will prevail. </p> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2005 Olaf Krzikalla<br>Copyright © 2006-2013 Ion Gaztanaga<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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