上传cppreference
This commit is contained in:
@@ -0,0 +1,90 @@
|
||||
<!DOCTYPE html>
|
||||
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
|
||||
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||
<title>std::feholdexcept</title>
|
||||
<link rel="stylesheet" href="ext.css" />
|
||||
<link rel="stylesheet" href="site_modules.css" />
|
||||
</head>
|
||||
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_fenv_feholdexcept skin-cppreference2 action-view cpp-navbar">
|
||||
<div id="cpp-content-base">
|
||||
<div id="content"><a id="top"></a>
|
||||
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>feholdexcept</h1>
|
||||
<div id="bodyContent">
|
||||
<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>
|
||||
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
|
||||
<table class="t-dcl-begin">
|
||||
<tbody>
|
||||
<tr class="t-dsc-header">
|
||||
<td>
|
||||
<div>定义于头文件 <code><a href="cpp-header-cfenv.html"><cfenv></a></code></div>
|
||||
</td>
|
||||
<td></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr class="t-dcl t-since-cxx11">
|
||||
<td>
|
||||
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> feholdexcept<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">fenv_t</span><span class="sy2">*</span> envp <span class="br0">)</span></span></div>
|
||||
</td>
|
||||
<td class="t-dcl-nopad"></td>
|
||||
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
|
||||
</tr>
|
||||
<tr class="t-dcl-sep">
|
||||
<td></td>
|
||||
<td></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>首先，保存当前浮点环境到 <code>envp</code> 所指向的对象（类似 <span class="t-lc"><a href="cpp-numeric-fenv-feenv.html">std::fegetenv</a></span> ），然后清除所有浮点状态标志，再安装不停止模式：未来的浮点异常将不中断执行（不会陷落），直至以 <span class="t-lc"><a href="cpp-numeric-fenv-feupdateenv.html">std::feupdateenv</a></span> 或 <span class="t-lc"><a href="cpp-numeric-fenv-feenv.html">std::fesetenv</a></span> 还原浮点状态。</p>
|
||||
<p>此函数可用于必须从调用方隐藏它可能引发的浮点异常的子程序的起始。若只是必须抑制某些异常，而其他必须报告，则通常在清除不想要的异常后通过调用 <span class="t-lc"><a href="cpp-numeric-fenv-feupdateenv.html">std::feupdateenv</a></span> 结束不停止模式。</p>
|
||||
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
|
||||
<table class="t-par-begin">
|
||||
<tr class="t-par">
|
||||
<td>envp</td>
|
||||
<td>-</td>
|
||||
<td>指向 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">fenv_t</span></span></span> 类型对象的指针，其中将存储浮点环境</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
|
||||
<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>
|
||||
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
|
||||
<table class="t-dsc-begin">
|
||||
<tr class="t-dsc">
|
||||
<td>
|
||||
<div class="t-dsc-member-div">
|
||||
<div><a href="cpp-numeric-fenv-feupdateenv.html"><span class="t-lines"><span>feupdateenv</span></span></a></div>
|
||||
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
||||
</div>
|
||||
</td>
|
||||
<td>恢复浮点环境并引发之前引发的异常<br />
|
||||
<span class="t-mark">(函数)</span></td>
|
||||
</tr>
|
||||
<tr class="t-dsc">
|
||||
<td>
|
||||
<div class="t-dsc-member-div">
|
||||
<div><a href="cpp-numeric-fenv-feenv.html"><span class="t-lines"><span>fegetenv</span><span>fesetenv</span></span></a></div>
|
||||
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
||||
</div>
|
||||
</td>
|
||||
<td>保存或恢复当前浮点环境<br />
|
||||
<span class="t-mark">(函数)</span></td>
|
||||
</tr>
|
||||
<tr class="t-dsc">
|
||||
<td>
|
||||
<div class="t-dsc-member-div">
|
||||
<div><a href="cpp-numeric-fenv-FE_DFL_ENV.html"><span class="t-lines"><span>FE_DFL_ENV</span></span></a></div>
|
||||
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
||||
</div>
|
||||
</td>
|
||||
<td>默认浮点环境<br />
|
||||
<span class="t-mark">(宏常量)</span></td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
<div class="visualClear"></div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user