107 lines
8.8 KiB
HTML
107 lines
8.8 KiB
HTML
<!DOCTYPE html>
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<title>std::resetiosflags</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_manip_resetiosflags skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>resetiosflags</h1>
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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> resetiosflags<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> resetiosflags<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> resetiosflags<span class="br0">(</span>mask<span class="br0">)</span></span></span> 中时，清除流 <code>out</code> 或 <code>in</code> 中 <code>mask</code> 所指定的所有格式标志。</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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<td>mask</td>
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<td>-</td>
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<td>要清除的标志位掩码</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>返回未指定类型的对象，使得若 <code>str</code> 是 <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> resetiosflags<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> resetiosflags<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><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><span class="br0">(</span><span class="nu0">0</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=".E7.A4.BA.E4.BE.8B">示例</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 <sstream></span>
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<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-basic_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> in<span class="br0">(</span><span class="st0">"10 010 10 010 10 010"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">int</span> n1, n2<span class="sy4">;</span>
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in <span class="sy1">>></span> <a href="cpp-io-manip-hex.html"><span class="kw1783">std::<span class="me2">oct</span></span></a> <span class="sy1">>></span> n1 <span class="sy1">>></span> n2<span class="sy4">;</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> <span class="st0">"Parsing <span class="es1">\"</span>10 010<span class="es1">\"</span> with std::oct gives: "</span> <span class="sy1"><<</span> n1 <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> n2 <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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in <span class="sy1">>></span> <a href="cpp-io-manip-hex.html"><span class="kw1781">std::<span class="me2">dec</span></span></a> <span class="sy1">>></span> n1 <span class="sy1">>></span> n2<span class="sy4">;</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> <span class="st0">"Parsing <span class="es1">\"</span>10 010<span class="es1">\"</span> with std::dec gives: "</span> <span class="sy1"><<</span> n1 <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> n2 <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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in <span class="sy1">>></span> std<span class="sy4">::</span><span class="me2">resetiosflags</span><span class="br0">(</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1682">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">basefield</span></span></a><span class="br0">)</span> <span class="sy1">>></span> n1 <span class="sy1">>></span> n2<span class="sy4">;</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> <span class="st0">"Parsing <span class="es1">\"</span>10 010<span class="es1">\"</span> with autodetect gives: "</span> <span class="sy1"><<</span> n1 <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> n2 <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">Parsing "10 010" with std::oct gives: 8 8
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Parsing "10 010" with std::dec gives: 10 10
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Parsing "10 010" with autodetect gives: 10 8</pre></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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<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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<div class="t-dsc-member-div">
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<div><a href="cpp-io-manip-setiosflags.html"><span class="t-lines"><span>setiosflags</span></span></a></div>
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</div>
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<td>设置指定的 ios_base 标志<br />
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<span class="t-mark">(函数)</span></td>
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</div>
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<div class="visualClear"></div>
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