68 lines
4.1 KiB
HTML
68 lines
4.1 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::ios_base::ios_base</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_ios_base_ios_base 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::ios_base::</span>ios_base</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-ios_base.html">ios base</a></span></div>
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<div 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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<td></td>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">private</span><span class="sy4">:</span><br />
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ios_base<span class="br0">(</span> <span class="kw4">const</span> ios_base<span class="sy3">&</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br />
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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></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
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ios_base<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<p>1) 复制构造函数被删除：流不可复制</p>
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<p>2) 默认构造函数受保护：只有导出类可构造 <code>std::ios_base</code> 。构造后内部状态未定义。导出类必须在首次使用或析构函数前调用 <a href="cpp-io-basic_ios-init.html"><tt>basic_ios::init()</tt></a> 完成初始化；否则行为未定义。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>同样的情况应用于 I/O 层级中的下个类 <span class="t-lc"><a href="cpp-io-basic_ios.html">std::basic_ios</a></span> 的构造函数。进一步导出的类（ <span class="t-lc"><a href="cpp-io-basic_istream.html">std::istream</a></span> 与 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::ostream</a></span> ）始终以具体的 streambuffer 构造，并可能多于一次调用 <a href="cpp-io-basic_ios-init.html"><tt>basic_ios::init()</tt></a> ，以完成其虚基类的初始化。</p>
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