929 lines
44 KiB
HTML
929 lines
44 KiB
HTML
<!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::basic_istringstream</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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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_istringstream 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>basic_istringstream</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></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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<div>定义于头文件 <code><a href="cpp-header-sstream.html"><sstream></a></code></div>
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</td>
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<td></td>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><br /></span>
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<p> <span class="kw1">class</span> CharT,<br />
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<span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="cpp-string-char_traits.html"><span class="kw1267">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span>,<br />
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<span class="kw1">class</span> Allocator <span class="sy1">=</span> <a href="cpp-memory-allocator.html"><span class="kw700">std::<span class="me2">allocator</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span><br /></p>
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<span class="sy1">></span> <span class="kw1">class</span> basic_istringstream<span class="sy4">;</span></div>
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<td></td>
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<p>类模板 <code>std::basic_istringstream</code> 实现基于字符串的流上的输入与输出操作。它等效地存储一个 <span class="t-lc"><a href="cpp-string-basic_string.html">std::basic_string</a></span> 的实例，并在其上进行输入操作。</p>
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<p>该类实际上在低层包装 <span class="t-lc"><a href="cpp-io-basic_stringbuf.html">std::basic_stringbuf</a></span> 的原生字符串设备到 <span class="t-lc"><a href="cpp-io-basic_istream.html">std::basic_istream</a></span> 的高层接口中。提供到独有 <span class="t-lc"><a href="cpp-io-basic_stringbuf.html">std::basic_stringbuf</a></span> 成员的完整接口。</p>
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<div class="t-inheritance-diagram">
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<div class="center">
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<div class="noresize" style="height: 45px; width: 561px;"><map name="ImageMap_1_336351321" id="ImageMap_1_336351321">
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<area href="cpp-io-ios_base.html" shape="rect" coords="5,6,107,39" alt="cpp/io/ios base" />
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<area href="cpp-io-basic_ios.html" shape="rect" coords="135,4,252,42" alt="cpp/io/basic ios" />
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<area href="cpp-io-basic_istream.html" shape="rect" coords="278,4,395,42" alt="cpp/io/basic istream" /></map><img alt="std-basic istringstream-inheritance.svg" src="std-basic_istringstream-inheritance.svg" width="561" height="45" usemap="#ImageMap_1_336351321" /></div>
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</div>
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<div style="text-align:center;">
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<p><span style="font-size:0.7em; line-height:130%">继承图</span></p>
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</div>
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</div>
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<p>亦定义对于常用字符类型的二个特化：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于头文件 <code><a href="cpp-header-sstream.html"><sstream></a></code></div>
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</td>
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</tr>
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<tr class="t-dsc-hitem">
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<td>类型</td>
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<td>定义</td>
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<tr class="t-dsc">
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<td><code>istringstream</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">basic_istringstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>wistringstream</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">basic_istringstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span></span></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>成员类型</td>
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<td>定义</td>
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<tr class="t-dsc">
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<td><code>char_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">CharT</span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>traits_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits</span></span> ；若 <code>Traits::char_type</code> 不是 <code>CharT</code> 则程序非良构。</td>
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</tr>
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<tr class="t-dsc">
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<td><code>int_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">int_type</span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>pos_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">pos_type</span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>off_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">off_type</span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>allocator_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Allocator</span></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-io-basic_istringstream-basic_istringstream.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造字符串流<br />
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<span class="t-mark">(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-basic_istringstream-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>移动字符串流<br />
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<span class="t-mark">(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-basic_istringstream-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>交换两个字符串流<br />
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<span class="t-mark">(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-basic_istringstream-rdbuf.html"><span class="t-lines"><span>rdbuf</span></span></a></div>
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</div>
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</td>
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<td>返回底层未处理的字符串设备对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E5.AD.97.E7.AC.A6.E4.B8.B2.E6.93.8D.E4.BD.9C">字符串操作</span></h5>
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</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-basic_istringstream-str.html"><span class="t-lines"><span>str</span></span></a></div>
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</div>
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</td>
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<td>获取或设置底层字符串设备对象的内容<br />
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<span class="t-mark">(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-basic_istringstream-view.html"><span class="t-lines"><span>view</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>获得底层字符串设备的内容上的视图<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</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-basic_istringstream-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::basic_istringstream)</span></span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>特化 <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<div class="t-inherited">
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::basic_istream">继承自 <a href="cpp-io-basic_istream.html"><span style="font-size:0.7em; line-height:130%">std::</span>basic_istream</a></span></h2>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E6.9C.89.E6.A0.BC.E5.BC.8F.E8.BE.93.E5.85.A5">有格式输入</span></h5>
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</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-basic_istream-operator_gtgt.html"><span class="t-lines"><span>operator>></span></span></a></div>
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</div>
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</td>
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<td>提取带格式数据<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E6.97.A0.E6.A0.BC.E5.BC.8F.E8.BE.93.E5.85.A5">无格式输入</span></h5>
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</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-basic_istream-get.html"><span class="t-lines"><span>get</span></span></a></div>
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</div>
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</td>
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<td>从流中读并取走（移除类似指针向下一个元素移动）一个字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-peek.html"><span class="t-lines"><span>peek</span></span></a></div>
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</div>
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</td>
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<td>仅读出但不取走（不移除类似指针并未移动）一个字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-unget.html"><span class="t-lines"><span>unget</span></span></a></div>
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</div>
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</td>
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<td>撤销流中刚取走（移除，类似指针向后退回一个位置）的字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-putback.html"><span class="t-lines"><span>putback</span></span></a></div>
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</div>
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</td>
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<td>往输入流中退回一个字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-getline.html"><span class="t-lines"><span>getline</span></span></a></div>
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</div>
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</td>
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<td>一直读并取走字符，直至找到给定字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-ignore.html"><span class="t-lines"><span>ignore</span></span></a></div>
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</div>
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</td>
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<td>读且取走并舍弃字符，直至发现给定字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-read.html"><span class="t-lines"><span>read</span></span></a></div>
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</div>
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</td>
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<td>读并取走一块字符<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-readsome.html"><span class="t-lines"><span>readsome</span></span></a></div>
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</div>
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</td>
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<td>读并取走已经可用的字符块<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-gcount.html"><span class="t-lines"><span>gcount</span></span></a></div>
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</div>
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</td>
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<td>返回上次无格式输出操作所取走的字符数量<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E5.AF.BB.E4.BD.8D">寻位</span></h5>
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</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-basic_istream-tellg.html"><span class="t-lines"><span>tellg</span></span></a></div>
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</div>
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</td>
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<td>返回输入位置指示器<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></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-basic_istream-seekg.html"><span class="t-lines"><span>seekg</span></span></a></div>
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</div>
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</td>
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<td>设置输入位置指示器<br />
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<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E6.9D.82.E9.A1.B9">杂项</span></h5>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_istream-sync.html"><span class="t-lines"><span>sync</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>与底层存储设备同步<br />
|
|
<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB">成员类</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_istream-sentry.html"><span class="t-lines"><span>sentry</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>实现为输出操作准备流的基本逻辑<br />
|
|
<span class="t-mark">(<code>std::basic_istream<CharT,Traits></code> 的公开成员类)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="t-inherited">
|
|
<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::basic_ios">继承自 <a href="cpp-io-basic_ios.html"><span style="font-size:0.7em; line-height:130%">std::</span>basic_ios</a></span></h2>
|
|
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B_2">成员类型</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc-hitem">
|
|
<td>成员类型</td>
|
|
<td>定义</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><code>char_type</code></td>
|
|
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">CharT</span></span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><code>traits_type</code></td>
|
|
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits</span></span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><code>int_type</code></td>
|
|
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">int_type</span></span></span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><code>pos_type</code></td>
|
|
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">pos_type</span></span></span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><code>off_type</code></td>
|
|
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">off_type</span></span></span></td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_3">成员函数</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E7.8A.B6.E6.80.81.E5.87.BD.E6.95.B0">状态函数</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-good.html"><span class="t-lines"><span>good</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否没有发生错误，例如是否可执行I/O操作<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-eof.html"><span class="t-lines"><span>eof</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否到达了文件末尾<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-fail.html"><span class="t-lines"><span>fail</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否发生了可恢复的错误<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-bad.html"><span class="t-lines"><span>bad</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否已发生不可恢复的错误<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-operator!.html"><span class="t-lines"><span>operator!</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否有错误发生（<a href="cpp-io-basic_ios-fail.html"><tt>fail()</tt></a> 的同义词）<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-operator_bool.html"><span class="t-lines"><span>operator void*</span><span>operator bool</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>检查是否没有发生错误（<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>fail<span class="br0">(</span><span class="br0">)</span></span></span>的同义词）<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-rdstate.html"><span class="t-lines"><span>rdstate</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>返回状态标志<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-setstate.html"><span class="t-lines"><span>setstate</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>设置状态标志<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-clear.html"><span class="t-lines"><span>clear</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>修改状态标志<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E6.A0.BC.E5.BC.8F.E5.8C.96">格式化</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-copyfmt.html"><span class="t-lines"><span>copyfmt</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>复制格式化信息<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-fill.html"><span class="t-lines"><span>fill</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理填充字符<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E6.9D.82.E9.A1.B9_2">杂项</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-exceptions.html"><span class="t-lines"><span>exceptions</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理异常掩码<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-imbue.html"><span class="t-lines"><span>imbue</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>设置本地环境<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-rdbuf.html"><span class="t-lines"><span>rdbuf</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理相关的流缓冲区<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-tie.html"><span class="t-lines"><span>tie</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理绑定的流<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-narrow.html"><span class="t-lines"><span>narrow</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>窄化字符<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-basic_ios-widen.html"><span class="t-lines"><span>widen</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>拓宽字符<br />
|
|
<span class="t-mark">(<code>std::basic_ios<CharT,Traits></code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="t-inherited">
|
|
<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::ios_base">继承自 <a href="cpp-io-ios_base.html"><span style="font-size:0.7em; line-height:130%">std::</span>ios_base</a></span></h2>
|
|
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_4">成员函数</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E6.A0.BC.E5.BC.8F.E5.8C.96_2">格式化</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-flags.html"><span class="t-lines"><span>flags</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理格式标志<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-setf.html"><span class="t-lines"><span>setf</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>设置特定格式标志<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-unsetf.html"><span class="t-lines"><span>unsetf</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>清除特定格式的标志<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-precision.html"><span class="t-lines"><span>precision</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理浮点操作的精度<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-width.html"><span class="t-lines"><span>width</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>管理域的宽度<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E6.9C.AC.E5.9C.B0.E7.8E.AF.E5.A2.83">本地环境</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-imbue.html"><span class="t-lines"><span>imbue</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>设置本地环境<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-getloc.html"><span class="t-lines"><span>getloc</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>返回当前本地环境<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E5.86.85.E9.83.A8.E5.8F.AF.E6.89.A9.E5.B1.95.E6.95.B0.E7.BB.84">内部可扩展数组</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-xalloc.html"><span class="t-lines"><span>xalloc</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回能安全用作 pword() 和 iword() 下标的程序范围内独有的整数<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开静态成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-iword.html"><span class="t-lines"><span>iword</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>如果有必要的话，调整私有存储的大小，并且访问位于提供的下标的<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span></span>元素<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-pword.html"><span class="t-lines"><span>pword</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>若需要则重置私有存储的大小，并访问位于指定下标的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">*</span></span></span> 元素<br />
|
|
<span class="t-mark">(<code>std::ios_base</code> 的公开成员函数)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E6.9D.82.E9.A1.B9_3">杂项</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
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<div><a href="cpp-io-ios_base-register_callback.html"><span class="t-lines"><span>register_callback</span></span></a></div>
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</div>
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</td>
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<td>注册事件回调函数<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-ios_base-sync_with_stdio.html"><span class="t-lines"><span>sync_with_stdio</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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</div>
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</td>
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<td>设置C++和C的IO库是否可以互操作<br />
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<span class="t-mark">(<code>std::ios_base</code> 的公开静态成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB_2">成员类</span></h5>
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</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-ios_base-failure.html"><span class="t-lines"><span>failure</span></span></a></div>
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</div>
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</td>
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<td>流异常<br />
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<span class="t-mark">(<code>std::ios_base</code> 的公开成员类)</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-ios_base-Init.html"><span class="t-lines"><span>Init</span></span></a></div>
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</div>
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</td>
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<td>初始化标准流对象<br />
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<span class="t-mark">(<code>std::ios_base</code> 的公开成员类)</span></td>
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</tr>
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</table>
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<table class="t-dsc-begin">
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B.E5.92.8C.E5.B8.B8.E9.87.8F">成员类型和常量</span></h3>
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</td>
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</tr>
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<tr class="t-dsc-hitem">
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<td>类型</td>
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<td>解释</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-ios_base-openmode.html"><span class="t-lines"><span>openmode</span></span></a></div>
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</div>
|
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</td>
|
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<td>流打开模式类型
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<p>亦定义下列常量：</p>
|
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<table class="t-dsc-begin">
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|
<tr class="t-dsc-hitem">
|
|
<td>常量</td>
|
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<td>解释</td>
|
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</tr>
|
|
<tr class="t-dsc">
|
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<td><a href="cpp-io-ios_base-openmode.html"><tt>app</tt></a></td>
|
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<td>每次写入前寻位到流结尾</td>
|
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</tr>
|
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<tr class="t-dsc">
|
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<td><a href="cpp-io-ios_base-openmode.html"><tt>binary</tt></a></td>
|
|
<td>以<a href="cpp-io-c-FILE.html#.E4.BA.8C.E8.BF.9B.E5.88.B6.E4.B8.8E.E6.96.87.E6.9C.AC.E6.A8.A1.E5.BC.8F">二进制模式</a>打开</td>
|
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</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-openmode.html"><tt>in</tt></a></td>
|
|
<td>为读打开</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-openmode.html"><tt>out</tt></a></td>
|
|
<td>为写打开</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-openmode.html"><tt>trunc</tt></a></td>
|
|
<td>在打开时舍弃流的内容</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-openmode.html"><tt>ate</tt></a></td>
|
|
<td>打开后立即寻位到流结尾</td>
|
|
</tr>
|
|
</table>
|
|
<br />
|
|
<span class="t-mark">(typedef)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-fmtflags.html"><span class="t-lines"><span>fmtflags</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>格式化标志类型
|
|
<p>亦定义下列常量：</p>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc-hitem">
|
|
<td>常量</td>
|
|
<td>解释</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>dec</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>oct</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>hex</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>basefield</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>left</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>right</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>internal</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>adjustfield</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>scientific</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>fixed</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>floatfield</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>boolalpha</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showbase</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpoint</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpos</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>skipws</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>unitbuf</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-fmtflags.html"><tt>uppercase</tt></a></td>
|
|
<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>
|
|
</tr>
|
|
</table>
|
|
<br />
|
|
<span class="t-mark">(typedef)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-iostate.html"><span class="t-lines"><span>iostate</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>流状态类型
|
|
<p>亦定义下列常量：</p>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc-hitem">
|
|
<td>常量</td>
|
|
<td>解释</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-iostate.html"><tt>goodbit</tt></a></td>
|
|
<td>无错误</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-iostate.html"><tt>badbit</tt></a></td>
|
|
<td>不可恢复的流错误</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-iostate.html"><tt>failbit</tt></a></td>
|
|
<td>输入/输出操作失败（格式化或提取错误）</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-iostate.html"><tt>eofbit</tt></a></td>
|
|
<td>关联的输出序列已抵达文件尾</td>
|
|
</tr>
|
|
</table>
|
|
<br />
|
|
<span class="t-mark">(typedef)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-seekdir.html"><span class="t-lines"><span>seekdir</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>寻位方向类型
|
|
<p>亦定义下列常量：</p>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc-hitem">
|
|
<td>常量</td>
|
|
<td>解释</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-seekdir.html"><tt>beg</tt></a></td>
|
|
<td>流的开始</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-seekdir.html"><tt>end</tt></a></td>
|
|
<td>流的结尾</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td><a href="cpp-io-ios_base-seekdir.html"><tt>cur</tt></a></td>
|
|
<td>流位置指示器的当前位置</td>
|
|
</tr>
|
|
</table>
|
|
<br />
|
|
<span class="t-mark">(typedef)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-event.html"><span class="t-lines"><span>event</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>指定事件类型<br />
|
|
<span class="t-mark">(枚举)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-io-ios_base-event_callback.html"><span class="t-lines"><span>event_callback</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>回调函数类型<br />
|
|
<span class="t-mark">(typedef)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
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</body>
|
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</html>
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