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<h1>sigc::is_base_and_derived< T_base, T_derived > Struct Template Reference</h1><!-- doxytag: class="sigc::is_base_and_derived" -->
<p>Compile-time determination of base-class relationship in C++ (adapted to match the syntax of boost's type_traits library). <a href="#_details">More...</a></p>
<p><code>#include <sigc++/type_traits.h></code></p>
<p><a href="structsigc_1_1is__base__and__derived-members.html">List of all members.</a></p>
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<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>avoid_gcc3_warning_</b> ()</td></tr>
<tr><td colspan="2"><h2>Static Public Attributes</h2></td></tr>
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static const bool </td><td class="memItemRight" valign="bottom"><b>value</b></td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<h3>template <class T_base, class T_derived><br/>
struct sigc::is_base_and_derived< T_base, T_derived ></h3>
<p>Compile-time determination of base-class relationship in C++ (adapted to match the syntax of boost's type_traits library). </p>
<p>Use this to provide a template specialization for a set of types. For instance,</p>
<p>template < class T_thing, bool Tval_derives_from_something = <a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01156.html#ga1c9e781d8d15a3814a601f471797c825">sigc::is_base_and_derived<Something, T_thing>::value</a> > class TheTemplate { //Standard implementation. }</p>
<p>//Specialization for T_things that derive from Something (Tval_derives_from_something is true) template <class t_thing>=""> class TheTemplate<T_thing, true> { T_thing thing; thing.method_that_is_in_something(); } </p>
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