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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h3 class="title"> | |
| 27 | <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> | |
| 28 | </h3></div></div></div> | |
| 29 | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> | |
| 30 | <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> | |
| 31 | </pre> | |
| 32 | <p> | |
| 33 | <span class="bold"><strong>Inherits:</strong></span> If T is a (possibly cv-qualified) | |
| 34 | type with a virtual destructor then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>, | |
| 35 | otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>. | |
| 36 | </p> | |
| 37 | <p> | |
| 38 | <span class="bold"><strong>Compiler Compatibility:</strong></span> There is currently | |
| 39 | no way to portably implement this trait: the default version always inherits | |
| 40 | from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>, | |
| 41 | and has to be explicitly specialized for types with virtual destructors unless | |
| 42 | the compiler used has compiler <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a> | |
| 43 | that enable the trait to do the right thing: Currently (June 2015) compilers | |
| 44 | more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0, Intel-11.0, plus | |
| 45 | Codegear and Clang have the necessary compiler <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a> | |
| 46 | to ensure that this trait "just works". You may also test to see | |
| 47 | if the necessary <a class="link" href="../intrinsics.html" title="Support for Compiler Intrinsics">intrinsics</a> | |
| 48 | are available by checking to see if the macro <code class="computeroutput"><span class="identifier">BOOST_HAS_VIRTUAL_DESTRUCTOR</span></code> | |
| 49 | is defined. | |
| 50 | </p> | |
| 51 | <p> | |
| 52 | <span class="bold"><strong>C++ Standard Reference:</strong></span> 12.4. | |
| 53 | </p> | |
| 54 | <p> | |
| 55 | <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span> | |
| 56 | <span class="special"><</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">></span></code> | |
| 57 | or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special"><</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">></span></code> | |
| 58 | </p> | |
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| 62 | <td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams, | |
| 63 | Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, | |
| 64 | Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten | |
| 65 | Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven | |
| 66 | Watanabe<p> | |
| 67 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 68 | 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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