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<title>has_virtual_destructor</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.has_virtual_destructor"></a><a class="link" href="has_virtual_destructor.html" title="has_virtual_destructor">has_virtual_destructor</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">has_virtual_destructor</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
        <span class="bold"><strong>Inherits:</strong></span> If T is a (possibly cv-qualified)
        type with a virtual destructor then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
        otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
      </p>
<p>
        <span class="bold"><strong>Compiler Compatibility:</strong></span> There is currently
        no way to portably implement this trait: the default version always inherits
        from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>,
        and has to be explicitly specialized for types with virtual destructors unless
        the compiler used has compiler <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a>
        that enable the trait to do the right thing: Currently (June 2015) compilers
        more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0, Intel-11.0, plus
        Codegear and Clang have the necessary compiler <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a>
        to ensure that this trait "just works". You may also test to see
        if the necessary <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a>
        are available by checking to see if the macro <code class="computeroutput"><span class="identifier">BOOST_HAS_VIRTUAL_DESTRUCTOR</span></code>
        is defined.
      </p>
<p>
        <span class="bold"><strong>C++ Standard Reference:</strong></span> 12.4.
      </p>
<p>
        <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
        <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">has_virtual_destructor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
        or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
      </p>
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