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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_typetraits.examples.destruct"></a><a class="link" href="destruct.html" title="An Example that Omits Destructor Calls For Types with Trivial Destructors"> An Example that |
| Omits Destructor Calls For Types with Trivial Destructors</a> |
| </h3></div></div></div> |
| <p> |
| Demonstrates a simple algorithm that uses <code class="computeroutput"><span class="identifier">__has_trivial_destruct</span></code> |
| to determine whether to destructors need to be called (see <a href="../../../../examples/trivial_destructor_example.cpp" target="_top">trivial_destructor_example.cpp</a>): |
| </p> |
| <pre class="programlisting"><span class="comment">// |
| </span><span class="comment">// algorithm destroy_array: |
| </span><span class="comment">// The reverse of std::unitialized_copy, takes a block of |
| </span><span class="comment">// initialized memory and calls destructors on all objects therein. |
| </span><span class="comment">// |
| </span> |
| <span class="keyword">namespace</span> <span class="identifier">detail</span><span class="special">{</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">do_destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">last</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><a class="link" href="../reference/integral_constant.html" title="integral_constant">false_type</a><span class="special">&)</span> |
| <span class="special">{</span> |
| <span class="keyword">while</span><span class="special">(</span><span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">first</span><span class="special">->~</span><span class="identifier">T</span><span class="special">();</span> |
| <span class="special">++</span><span class="identifier">first</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">void</span> <span class="identifier">do_destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">last</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><a class="link" href="../reference/integral_constant.html" title="integral_constant">true_type</a><span class="special">&)</span> |
| <span class="special">{</span> |
| <span class="special">}</span> |
| |
| <span class="special">}</span> <span class="comment">// namespace detail |
| </span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="keyword">void</span> <span class="identifier">destroy_array</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="identifier">p1</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p2</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">detail</span><span class="special">::</span><span class="identifier">do_destroy_array</span><span class="special">(</span><span class="identifier">p1</span><span class="special">,</span> <span class="identifier">p2</span><span class="special">,</span> <span class="special">::</span><span class="identifier">boost</span><span class="special">::</span><a class="link" href="../reference/has_trivial_destructor.html" title="has_trivial_destructor">has_trivial_destructor</a><span class="special"><</span><span class="identifier">T</span><span class="special">>());</span> |
| <span class="special">}</span> |
| </pre> |
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| <td align="right"><div class="copyright-footer">Copyright © 2000, 2006 Adobe Systems Inc, David Abrahams, |
| Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, Jesse Jones, Mat |
| Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten Ottosen, Robert |
| Ramey and Jeremy Siek<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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