76 lines
3.3 KiB
HTML
76 lines
3.3 KiB
HTML
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<title>static_assert</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_error_static_assert skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">static_assert</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-error.html">error</a></span></div>
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<div>定义于头文件 <code><assert.h></code></div>
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<div><span class="mw-geshi c source-c"><span class="co2">#define static_assert _Static_assert</span></span></div>
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<p>此便利宏展开成关键词 <a href="c-keyword-_Static_assert.html">_Static_assert</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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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <assert.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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static_assert<span class="br0">(</span><span class="nu0">2</span> <span class="sy2">+</span> <span class="nu0">2</span> <span class="sy1">==</span> <span class="nu0">4</span>, <span class="st0">"2+2 isn't 4"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 良式</span>
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static_assert<span class="br0">(</span><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="sy1"><</span> <span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">char</span><span class="br0">)</span>,
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<span class="st0">"this program requires that int is less than char"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 编译时错误</span>
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<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.2/3 Diagnostics <assert.h> (p: 186)</li>
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</ul>
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</dd>
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</dl>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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