159 lines
9.2 KiB
HTML
159 lines
9.2 KiB
HTML
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<title>std::ios_base::unsetf</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ios_base::</span>unsetf</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-ios_base.html">ios base</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> unsetf<span class="br0">(</span> fmtflags flags <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>反设置 <code>flags</code> 所表示的格式化标志。</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>flags</td>
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<td>-</td>
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<td>要反设置的格式化标志。它能为下列常量的组合：
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<td>常量</td>
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<td>解释</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>dec</tt></a></td>
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<td>为整数 I/O 使用十进制底：见 <span class="t-lc"><a href="cpp-io-manip-hex.html">std::dec</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>oct</tt></a></td>
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<td>为整数 I/O 使用八进制底：见 <span class="t-lc"><a href="cpp-io-manip-hex.html">std::oct</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>hex</tt></a></td>
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<td>为整数 I/O 使用十六进制底：见 <span class="t-lc"><a href="cpp-io-manip-hex.html">std::hex</a></span></td>
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</tr>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>basefield</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">dec<span class="sy3">|</span>oct<span class="sy3">|</span>hex</span></span> 。适用于掩码运算</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>left</tt></a></td>
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<td>左校正（添加填充字符到右）：见 <span class="t-lc"><a href="cpp-io-manip-left.html">std::left</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>right</tt></a></td>
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<td>右校正（添加填充字符到左）：见 <span class="t-lc"><a href="cpp-io-manip-left.html">std::right</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>internal</tt></a></td>
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<td>内部校正（添加填充字符到内部选定点）：见 <span class="t-lc"><a href="cpp-io-manip-left.html">std::internal</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>adjustfield</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">left<span class="sy3">|</span>right<span class="sy3">|</span>internal</span></span> 。适用于掩码运算</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>scientific</tt></a></td>
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<td>用科学记数法生成浮点类型，或若与 fixed 组合则用十六进制记法：见 <span class="t-lc"><a href="cpp-io-manip-fixed.html">std::scientific</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>fixed</tt></a></td>
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<td>用定点记法生成浮点类型，或若与 scientific 组合则用十六进制记法：见 <span class="t-lc"><a href="cpp-io-manip-fixed.html">std::fixed</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>floatfield</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">scientific<span class="sy3">|</span>fixed</span></span> 。适用于掩码运算</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>boolalpha</tt></a></td>
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<td>以字母数字格式插入并释出 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> 类型：见 <span class="t-lc"><a href="cpp-io-manip-boolalpha.html">std::boolalpha</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showbase</tt></a></td>
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<td>生成为整数输出指示数字基底的前缀，货币 I/O 中要求现金指示器：见 <span class="t-lc"><a href="cpp-io-manip-showbase.html">std::showbase</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpoint</tt></a></td>
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<td>无条件为浮点数输出生成小数点字符：见 <span class="t-lc"><a href="cpp-io-manip-showpoint.html">std::showpoint</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpos</tt></a></td>
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<td>为非负数值输出生成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">+</span></span></span> 字符，见 <span class="t-lc"><a href="cpp-io-manip-showpos.html">std::showpos</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>skipws</tt></a></td>
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<td>在具体输入操作前跳过前导空白符：见 <span class="t-lc"><a href="cpp-io-manip-skipws.html">std::skipws</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>unitbuf</tt></a></td>
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<td>在每次输出操作后冲入输出：见 <span class="t-lc"><a href="cpp-io-manip-unitbuf.html">std::unitbuf</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>uppercase</tt></a></td>
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<td>在具体输出的输出操作中以大写等价替换小写字符：见 <span class="t-lc"><a href="cpp-io-manip-uppercase.html">std::uppercase</a></span></td>
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<p><br /></p>
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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>（无）</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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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-io-ios_base-flags.html"><span class="t-lines"><span>flags</span></span></a></div>
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<td>管理格式标志<br />
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<span class="t-mark">(公开成员函数)</span></td>
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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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<td>设置特定格式标志<br />
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<span class="t-mark">(公开成员函数)</span></td>
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