73 lines
4.8 KiB
HTML
73 lines
4.8 KiB
HTML
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<title>std::fegetexceptflag, std::fesetexceptflag</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>fegetexceptflag, <span style="font-size:0.7em; line-height:130%">std::</span>fesetexceptflag</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-fenv.html">fenv</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-cfenv.html"><cfenv></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fegetexceptflag<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">fexcept_t</span><span class="sy2">*</span> flagp, <span class="kw4">int</span> excepts <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fesetexceptflag<span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">fexcept_t</span><span class="sy2">*</span> flagp, <span class="kw4">int</span> excepts <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>1) 试图获得列于位掩码参数 <code>excepts</code> 的浮点异常标志的完整内容，它是<a href="cpp-numeric-fenv-FE_exceptions.html">浮点异常宏</a>的逐位或。</p>
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<p>2) 试图从 <code>flagp</code> 复制列于 <code>excepts</code> 的浮点异常标志到浮点环境。不引发任何异常，只修改标志。</p>
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<p>浮点异常标志的完整内容不必是指示是否引发或清除异常的布尔值。例如，它可以是结构体，包含布尔状态和触发了异常的代码地址。这些函数获得所有这种内容，并以实现定义格式于 <code>flagp</code> 获得/存储它。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>flagp</td>
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<td>-</td>
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<td>指向将要存储或读取标志位置的 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">fexcept_t</span></span></span> 对象的指针</td>
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<td>excepts</td>
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<td>-</td>
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<td>列出要获取/设置的异常的位掩码</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>成功时为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> ，否则为非零。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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