105 lines
5.8 KiB
HTML
105 lines
5.8 KiB
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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<title>std::basic_ios<CharT,Traits>::init</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_ios_init skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ios<CharT,Traits>::</span>init</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-basic_ios.html">basic ios</a></span></div>
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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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<span class="kw4">void</span> init<span class="br0">(</span> <a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy2">*</span> sb <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td></td>
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<p>设置关联流缓冲为 <code>sb</code> 并初始化内部状态。</p>
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<p>后置条件如下：</p>
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<th>元素</th>
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<th>值</th>
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<td><span class="t-lc"><a href="cpp-io-basic_ios-rdbuf.html">rdbuf()</a></span></td>
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<td><code>sb</code></td>
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<td><span class="t-lc"><a href="cpp-io-basic_ios-tie.html">tie()</a></span></td>
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<td>空指针</td>
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<td><span class="t-lc"><a href="cpp-io-basic_ios-rdstate.html">rdstate()</a></span></td>
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<td>若 <code>sb</code> 不是空指针, 则为 <code>goodbit</code> ，否则为 <code>badbit</code></td>
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<td><span class="t-lc"><a href="cpp-io-basic_ios-exceptions.html">exceptions()</a></span></td>
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<td><code>goodbit</code></td>
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<td><a href="cpp-io-ios_base-flags.html"><tt>flags()</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">skipws <span class="sy3">|</span> dec</span></span></td>
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<td><a href="cpp-io-ios_base-width.html"><tt>width()</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span></td>
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<td><a href="cpp-io-ios_base-precision.html"><tt>precision()</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">6</span></span></span></td>
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<td><span class="t-lc"><a href="cpp-io-basic_ios-fill.html">fill()</a></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">widen<span class="br0">(</span><span class="st0">' '</span><span class="br0">)</span></span></span></td>
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<td><a href="cpp-io-ios_base-getloc.html"><tt>getloc()</tt></a></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="br0">)</span></span></span> 所返回的值的副本</td>
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<p>此成员函数为受保护：一旦知晓实际缓冲区类型，则它为派生流类 <span class="t-lc"><a href="cpp-io-basic_istream.html">std::basic_istream</a></span> 和 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::basic_ostream</a></span> 的构造函数所调用。直至调用此函数前，默认构造的 <span class="t-lc"><a href="cpp-io-basic_ios.html">std::basic_ios</a></span> 每个成员函数（包括析构函数）都引发未定义行为。注意 <code>basic_ios</code> 是虚基类，从而其构造函数不为直接派生类的构造函数所调用，此乃二阶段初始化为必须的原因。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>sb</td>
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<td>-</td>
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<td>要关联到的流缓冲</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-io-basic_ios-basic_ios.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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