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<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::setiosflags</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_manip_setiosflags 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"><span style="font-size:0.7em; line-height:130%">std::</span>setiosflags</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-manip.html">manip</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-iomanip.html"><iomanip></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*unspecified*/</span> setiosflags<span class="br0">(</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1678">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fmtflags</span></span></a> mask <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>用于表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">out <span class="sy1"><<</span> setiosflags<span class="br0">(</span>mask<span class="br0">)</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">>></span> setiosflags<span class="br0">(</span>mask<span class="br0">)</span></span></span> 时，设置流 <code>out</code> 或 <code>in</code> 的所有格式标志为 <code>mask</code> 所指定者。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>mask</td>
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<td>-</td>
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<td>要设置的位掩码标志</td>
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</tr>
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</table>
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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>返回未指定类型的对象，使得若 <code>str</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span></span> 类型的流名称，则表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">str <span class="sy1"><<</span> setiosflags<span class="br0">(</span>mask<span class="br0">)</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">str <span class="sy1">>></span> setiosflags<span class="br0">(</span>mask<span class="br0">)</span></span></span> 表现为如同执行下列代码：</p>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">setf</span><span class="br0">(</span>mask<span class="br0">)</span><span class="sy4">;</span></span></span></p>
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<h3><span class="mw-headline" id="Example">Example</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <iomanip></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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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-resetiosflags.html"><span class="kw1792">std::<span class="me2">resetiosflags</span></span></a><span class="br0">(</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1679">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">dec</span></span></a><span class="br0">)</span>
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<span class="sy1"><<</span> std<span class="sy4">::</span><span class="me2">setiosflags</span><span class="br0">(</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1681">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">hex</span></span></a>
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<span class="sy3">|</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1696">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">uppercase</span></span></a>
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<span class="sy3">|</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1691">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showbase</span></span></a><span class="br0">)</span> <span class="sy1"><<</span> <span class="nu0">42</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">0X2A</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-ios_base-setf.html"><span class="t-lines"><span>setf</span></span></a></div>
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</div>
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</td>
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<td>设置特定格式标志<br />
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<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-manip-resetiosflags.html"><span class="t-lines"><span>resetiosflags</span></span></a></div>
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</div>
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</td>
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<td>清除指定的 ios_base 标志<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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