97 lines
5.2 KiB
HTML
97 lines
5.2 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::fpos<State>::state</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_fpos_state 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::fpos<State>::</span>state</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>‎ | <a href="cpp-io-fpos.html">fpos</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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<div><span class="mw-geshi cpp source-cpp">State state<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> state<span class="br0">(</span> State st <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td class="t-dcl-nopad"></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>管理文件位置状态。</p>
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<div class="t-li1"><span class="t-li">1)</span> 返回文件位置状态的值。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 <code>st</code> 的值替换文件位置状态。</div>
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<p>对于 <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 用于标准库的特化， <code>State</code> 始终为 <span class="t-lc"><a href="cpp-string-multibyte-mbstate_t.html">std::mbstate_t</a></span> 。</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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<tr class="t-par">
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<td>st</td>
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<td>-</td>
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<td>状态的新值</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> fpos 状态的当前值</div>
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<div class="t-li1"><span class="t-li">2)</span> （无）</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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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 <iostream></span>
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<span class="co2">#include <sstream></span>
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<span class="co2">#include <cwchar></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-basic_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> s<span class="br0">(</span><span class="st0">"test"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-string-multibyte-mbstate_t.html"><span class="kw1179">std::<span class="me2">mbstate_t</span></span></a> st <span class="sy1">=</span> s.<span class="me1">tellg</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">state</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span><span class="br0">(</span><a href="cpp-string-multibyte-mbsinit.html"><span class="kw1167">std::<span class="me2">mbsinit</span></span></a><span class="br0">(</span><span class="sy3">&</span>st<span class="br0">)</span><span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"The stream is in the initial shift state<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">The stream is in the initial shift state</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-multibyte-mbstate_t.html"><span class="t-lines"><span>mbstate_t</span></span></a></div>
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</div>
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</td>
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<td>迭代多字节字符串所需的转换状态信息<br />
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<span class="t-mark">(类)</span></td>
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</tr>
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</table>
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