73 lines
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73 lines
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<title>std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>:: ~wstring_convert</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>::</span> ~wstring_convert</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-locale.html">locale</a>‎ | <a href="cpp-locale-wstring_convert.html">wstring convert</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">~wstring_convert<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>销毁 <code>wstring_convert</code> 对象并删除指向转换平面的指针。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>一些实现能删除任何平面，包含拥有受保护析构函数的本地环境限定平面。其他实现要求平面拥有公开析构函数，类似来自 <code><codecvt></code> 的本地环境独立平面。此为 <a rel="nofollow" class="external text" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-closed.html#721">LWG 问题 721</a> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<pre class="de1"><span class="co2">#include <locale></span>
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<span class="co2">#include <utility></span>
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<span class="co2">#include <codecvt></span>
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<span class="co1">// 包装 wstring/wbuffer_convert 所用的绑定本地环境平面的工具</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Facet<span class="sy1">></span>
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<span class="kw1">struct</span> deletable_facet <span class="sy4">:</span> Facet
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<span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ...<span class="me1">Args</span><span class="sy1">></span>
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deletable_facet<span class="br0">(</span>Args<span class="sy3">&&</span> ...<span class="me1">args</span><span class="br0">)</span> <span class="sy4">:</span> Facet<span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Args<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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~deletable_facet<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="co1">// GB18030 / UCS4 转换，直接使用基于本地环境的平面</span>
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<span class="co1">// typedef std::codecvt_byname<char32_t, char, std::mbstate_t> gbfacet_t;</span>
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<span class="co1">// 编译错误： "calling a protected destructor of codecvt_byname<> in ~wstring_convert"</span>
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<span class="co1">// std::wstring_convert<gbfacet_t> gbto32(new gbfacet_t("zh_CN.gb18030"));</span>
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<span class="co1">// GB18030 / UCS4 转换平面使用拥有公开析构函数的平面</span>
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<span class="kw1">typedef</span> deletable_facet<span class="sy1"><</span><a href="cpp-locale-codecvt_byname.html"><span class="kw1976">std::<span class="me2">codecvt_byname</span></span></a><span class="sy1"><</span><span class="kw4">char32_t</span>, <span class="kw4">char</span>, <a href="cpp-string-multibyte-mbstate_t.html"><span class="kw1179">std::<span class="me2">mbstate_t</span></span></a><span class="sy1">>></span> gbfacet_t<span class="sy4">;</span>
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<a href="cpp-locale-wstring_convert.html"><span class="kw1899">std::<span class="me2">wstring_convert</span></span></a><span class="sy1"><</span>gbfacet_t<span class="sy1">></span> gbto32<span class="br0">(</span>new gbfacet_t<span class="br0">(</span><span class="st0">"zh_CN.gb18030"</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="co1">// 析构函数调用于此</span></pre></div>
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