497 lines
40 KiB
HTML
497 lines
40 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>标准库头文件 <ios></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_header_ios 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%">标准库头文件</span> <ios></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-header.html">header</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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<p>此头文件是<a href="cpp-io.html">输入/输出</a>库的一部分。</p>
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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=".E5.8C.85.E5.90.AB">包含</span></h3>
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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-header-iosfwd.html"><span class="t-lines"><span><iosfwd></span></span></a></div>
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</div>
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</td>
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<td>输入/输出库中所有类的前置声明</td>
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</tr>
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E7.B1.BB">类</span></h3>
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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.html"><span class="t-lines"><span>ios_base</span></span></a></div>
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</div>
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</td>
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<td>管理格式化标志和输入/输出异常<br />
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<span class="t-mark">(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-basic_ios.html"><span class="t-lines"><span>basic_ios</span></span></a></div>
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</div>
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</td>
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<td>管理任意流缓冲<br />
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<span class="t-mark">(类模板)</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-fpos.html"><span class="t-lines"><span>fpos</span></span></a></div>
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</div>
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</td>
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<td>表示流或文件中的绝对位置<br />
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<span class="t-mark">(类模板)</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-io_errc.html"><span class="t-lines"><span>io_errc</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>IO 流的错误码<br />
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<span class="t-mark">(枚举)</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-io_errc-is_error_code_enum.html"><span class="t-lines"><span>is_error_code_enum<span class="t-dsc-small"><std::io_errc></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>扩充类型特征 <span class="t-lc"><a href="cpp-error-error_code-is_error_code_enum.html">std::is_error_code_enum</a></span> 以鉴别 iostream 错误码<br />
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<span class="t-mark">(类模板特化)</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-streamoff.html"><span class="t-lines"><span>streamoff</span></span></a></div>
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</div>
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</td>
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<td>表示相对的文件/流位置（距 fpos 的偏移），足以表示任何文件大小<br />
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<span class="t-mark">(typedef)</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-streamsize.html"><span class="t-lines"><span>streamsize</span></span></a></div>
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</div>
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</td>
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<td>表示一次 I/O 操作中转移的字符数或 I/O 缓冲区的大小<br />
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<span class="t-mark">(typedef)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">函数</span></h3>
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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-iostream_category.html"><span class="t-lines"><span>iostream_category</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>鉴别 iostream 错误类别<br />
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<span class="t-mark">(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-io_errc-make_error_code.html"><span class="t-lines"><span>make_error_code<span class="t-dsc-small">(std::io_errc)</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>构造一个 iostream 错误码<br />
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<span class="t-mark">(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-io_errc-make_error_condition.html"><span class="t-lines"><span>make_error_condition<span class="t-dsc-small">(std::io_errc)</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>构造一个 iostream error_condition<br />
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<span class="t-mark">(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-boolalpha.html"><span class="t-lines"><span>boolalpha</span><span>noboolalpha</span></span></a></div>
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</div>
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</td>
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<td>在布尔值的文本和数值表示间切换<br />
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<span class="t-mark">(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-showbase.html"><span class="t-lines"><span>showbase</span><span>noshowbase</span></span></a></div>
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</div>
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</td>
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<td>控制是否使用前缀指示数值基数<br />
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<span class="t-mark">(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-showpoint.html"><span class="t-lines"><span>showpoint</span><span>noshowpoint</span></span></a></div>
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</div>
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</td>
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<td>控制浮点表示是否始终包含小数点<br />
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<span class="t-mark">(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-showpos.html"><span class="t-lines"><span>showpos</span><span>noshowpos</span></span></a></div>
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</div>
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</td>
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<td>控制是否将 <code>+</code> 号与非负数一同使用<br />
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<span class="t-mark">(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-skipws.html"><span class="t-lines"><span>skipws</span><span>noskipws</span></span></a></div>
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</div>
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</td>
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<td>控制是否跳过输入上的前导空白符<br />
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<span class="t-mark">(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-uppercase.html"><span class="t-lines"><span>uppercase</span><span>nouppercase</span></span></a></div>
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</div>
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</td>
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<td>控制一些输出操作是否使用大写字母<br />
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<span class="t-mark">(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-unitbuf.html"><span class="t-lines"><span>unitbuf</span><span>nounitbuf</span></span></a></div>
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</div>
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</td>
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<td>控制是否每次操作后冲洗输出<br />
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<span class="t-mark">(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-left.html"><span class="t-lines"><span>internal</span><span>left</span><span>right</span></span></a></div>
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</div>
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</td>
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<td>设置填充字符的布置<br />
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<span class="t-mark">(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-hex.html"><span class="t-lines"><span>dec</span><span>hex</span><span>oct</span></span></a></div>
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</div>
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</td>
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<td>更改用于整数 I/O 的基数<br />
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<span class="t-mark">(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-fixed.html"><span class="t-lines"><span>fixed</span><span>scientific</span><span>hexfloat</span><span>defaultfloat</span></span></a></div>
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<div><span class="t-lines"><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><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>更改用于浮点 I/O 的格式化<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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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
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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 <iosfwd></span>
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<span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">using</span> streamoff <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> streamsize <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> StateT<span class="sy1">></span> <span class="kw1">class</span> fpos<span class="sy4">;</span>
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<span class="kw1">class</span> ios_base<span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1"><</span>CharT<span class="sy1">>></span>
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<span class="kw1">class</span> basic_ios<span class="sy4">;</span>
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<span class="co1">// 操纵符</span>
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ios_base<span class="sy3">&</span> boolalpha <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> noboolalpha<span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> showbase <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> noshowbase <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> showpoint <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> noshowpoint<span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> showpos <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> noshowpos <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> skipws <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> noskipws <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> uppercase <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> nouppercase<span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> unitbuf <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> nounitbuf <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 调整域</span>
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ios_base<span class="sy3">&</span> internal <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> left <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> right <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 基底域</span>
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ios_base<span class="sy3">&</span> dec <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> hex <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> oct <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 浮点域</span>
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ios_base<span class="sy3">&</span> fixed <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> scientific <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> hexfloat <span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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ios_base<span class="sy3">&</span> defaultfloat<span class="br0">(</span>ios_base<span class="sy3">&</span> str<span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 错误报告</span>
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<span class="kw2">enum</span> <span class="kw1">class</span> io_errc <span class="br0">{</span>
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stream <span class="sy1">=</span> <span class="nu0">1</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">struct</span> is_error_code_enum<span class="sy1"><</span>io_errc<span class="sy1">></span> <span class="sy4">:</span> <span class="kw1">public</span> true_type <span class="br0">{</span> <span class="br0">}</span><span class="sy4">;</span>
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error_code make_error_code<span class="br0">(</span>io_errc e<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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error_condition make_error_condition<span class="br0">(</span>io_errc e<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">const</span> error_category<span class="sy3">&</span> iostream_category<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::ios_base">类 <span class="t-lc"><a href="cpp-io-ios_base.html">std::ios_base</a></span></span></h4>
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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="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> ios_base <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">class</span> failure<span class="sy4">;</span> <span class="co1">// 见描述</span>
|
|
|
|
<span class="co1">// fmtflags</span>
|
|
<span class="kw1">using</span> fmtflags <span class="sy1">=</span> <span class="coMULTI">/*位掩码类型-1*/</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags boolalpha <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags dec <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags fixed <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags hex <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags internal <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags left <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags oct <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags right <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags scientific <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags showbase <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags showpoint <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags showpos <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags skipws <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags unitbuf <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags uppercase <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags adjustfield <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags basefield <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> fmtflags floatfield <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// iostate</span>
|
|
<span class="kw1">using</span> iostate <span class="sy1">=</span> <span class="coMULTI">/*位掩码类型-2*/</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> iostate badbit <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> iostate eofbit <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> iostate failbit <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> iostate goodbit <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// openmode</span>
|
|
<span class="kw1">using</span> openmode <span class="sy1">=</span> <span class="coMULTI">/*位掩码类型-3*/</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode app <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode ate <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode binary <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode in <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode out <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> openmode trunc <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// seekdir</span>
|
|
<span class="kw1">using</span> seekdir <span class="sy1">=</span> <span class="coMULTI">/*位掩码类型-4*/</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> seekdir beg <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> seekdir cur <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> seekdir end <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">class</span> Init<span class="sy4">;</span>
|
|
|
|
<span class="co1">// fmtflags 状态</span>
|
|
fmtflags flags<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
fmtflags flags<span class="br0">(</span>fmtflags fmtfl<span class="br0">)</span><span class="sy4">;</span>
|
|
fmtflags setf<span class="br0">(</span>fmtflags fmtfl<span class="br0">)</span><span class="sy4">;</span>
|
|
fmtflags setf<span class="br0">(</span>fmtflags fmtfl, fmtflags mask<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> unsetf<span class="br0">(</span>fmtflags mask<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
streamsize precision<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
streamsize precision<span class="br0">(</span>streamsize prec<span class="br0">)</span><span class="sy4">;</span>
|
|
streamsize width<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
streamsize width<span class="br0">(</span>streamsize wide<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 本地环境</span>
|
|
locale imbue<span class="br0">(</span><span class="kw4">const</span> locale<span class="sy3">&</span> loc<span class="br0">)</span><span class="sy4">;</span>
|
|
locale getloc<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 存储</span>
|
|
<span class="kw4">static</span> <span class="kw4">int</span> xalloc<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">long</span><span class="sy3">&</span> iword<span class="br0">(</span><span class="kw4">int</span> idx<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span><span class="sy2">*</span><span class="sy3">&</span> pword<span class="br0">(</span><span class="kw4">int</span> idx<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 析构函数</span>
|
|
<span class="kw1">virtual</span> ~ios_base<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 回调</span>
|
|
<span class="kw2">enum</span> event <span class="br0">{</span> erase_event, imbue_event, copyfmt_event <span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> event_callback <span class="sy1">=</span> <span class="kw4">void</span> <span class="br0">(</span><span class="sy2">*</span><span class="br0">)</span><span class="br0">(</span>event, ios_base<span class="sy3">&</span>, <span class="kw4">int</span> idx<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> register_callback<span class="br0">(</span>event_callback fn, <span class="kw4">int</span> idx<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
ios_base<span class="br0">(</span><span class="kw4">const</span> ios_base<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
ios_base<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> ios_base<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
|
|
|
|
<span class="kw4">static</span> <span class="kw4">bool</span> sync_with_stdio<span class="br0">(</span><span class="kw4">bool</span> sync <span class="sy1">=</span> <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">protected</span><span class="sy4">:</span>
|
|
ios_base<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw4">static</span> <span class="kw4">int</span> index<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">long</span><span class="sy2">*</span> iarray<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">void</span><span class="sy2">**</span> parray<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ios_base::failure">类 <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">class</span> ios_base<span class="sy4">::</span><span class="me2">failure</span> <span class="sy4">:</span> <span class="kw1">public</span> system_error <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">explicit</span> failure<span class="br0">(</span><span class="kw4">const</span> string<span class="sy3">&</span> msg, <span class="kw4">const</span> error_code<span class="sy3">&</span> ec <span class="sy1">=</span> io_errc<span class="sy4">::</span><span class="me2">stream</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">explicit</span> failure<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> msg, <span class="kw4">const</span> error_code<span class="sy3">&</span> ec <span class="sy1">=</span> io_errc<span class="sy4">::</span><span class="me2">stream</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ios_base::Init">类 <span class="t-lc"><a href="cpp-io-ios_base-Init.html">std::ios_base::Init</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">class</span> ios_base<span class="sy4">::</span><span class="me2">Init</span> <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
Init<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
Init<span class="br0">(</span><span class="kw4">const</span> Init<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
~Init<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
Init<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> Init<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw4">static</span> <span class="kw4">int</span> init_cnt<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::fpos">类模板 <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> StateT<span class="sy1">></span> <span class="kw1">class</span> fpos <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="co1">// 成员</span>
|
|
StateT state<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> state<span class="br0">(</span>stateT<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">private</span><span class="sy4">;</span>
|
|
StateT st<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::basic_ios">类模板 <span class="t-lc"><a href="cpp-io-basic_ios.html">std::basic_ios</a></span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1"><</span>CharT<span class="sy1">>></span>
|
|
<span class="kw1">class</span> basic_ios <span class="sy4">:</span> <span class="kw1">public</span> ios_base <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> char_type <span class="sy1">=</span> CharT<span class="sy4">;</span>
|
|
<span class="kw1">using</span> int_type <span class="sy1">=</span> <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">int_type</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> pos_type <span class="sy1">=</span> <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">pos_type</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> off_type <span class="sy1">=</span> <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">off_type</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> traits_type <span class="sy1">=</span> Traits<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 标志函数</span>
|
|
<span class="kw1">explicit</span> operator <span class="kw4">bool</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
iostate rdstate<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> clear<span class="br0">(</span>iostate state <span class="sy1">=</span> goodbit<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> setstate<span class="br0">(</span>iostate state<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">bool</span> good<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">bool</span> eof<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">bool</span> fail<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">bool</span> bad<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
iostate exceptions<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">void</span> exceptions<span class="br0">(</span>iostate except<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 构造函数/析构函数</span>
|
|
<span class="kw1">explicit</span> basic_ios<span class="br0">(</span>basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> sb<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">virtual</span> ~basic_ios<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 成员</span>
|
|
basic_ostream<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> tie<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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basic_ostream<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> tie<span class="br0">(</span>basic_ostream<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> tiestr<span class="br0">)</span><span class="sy4">;</span>
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basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> rdbuf<span class="br0">(</span>basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> sb<span class="br0">)</span><span class="sy4">;</span>
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basic_ios<span class="sy3">&</span> copyfmt<span class="br0">(</span><span class="kw4">const</span> basic_ios<span class="sy3">&</span> rhs<span class="br0">)</span><span class="sy4">;</span>
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char_type fill<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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char_type fill<span class="br0">(</span>char_type ch<span class="br0">)</span><span class="sy4">;</span>
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locale imbue<span class="br0">(</span><span class="kw4">const</span> locale<span class="sy3">&</span> loc<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">char</span> narrow<span class="br0">(</span>char_type c, <span class="kw4">char</span> dfault<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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char_type widen<span class="br0">(</span><span class="kw4">char</span> c<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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basic_ios<span class="br0">(</span><span class="kw4">const</span> basic_ios<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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basic_ios<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> basic_ios<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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<span class="kw1">protected</span><span class="sy4">:</span>
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basic_ios<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">void</span> init<span class="br0">(</span>basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> sb<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">void</span> move<span class="br0">(</span>basic_ios<span class="sy3">&</span> rhs<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">void</span> move<span class="br0">(</span>basic_ios<span class="sy3">&&</span> rhs<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">void</span> swap<span class="br0">(</span>basic_ios<span class="sy3">&</span> rhs<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">void</span> set_rdbuf<span class="br0">(</span>basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> sb<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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