91 lines
5.1 KiB
HTML
91 lines
5.1 KiB
HTML
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<title>std::streamoff</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_streamoff 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::</span>streamoff</h1>
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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>定义于头文件 <code><a href="cpp-header-ios.html"><ios></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">typedef</span> <span class="coMULTI">/*unspecified*/</span> streamoff<span class="sy4">;</span></span></div>
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<p><code>std::streamoff</code> 是足以表示操作系统所支持的最大可能文件大小的有符号整数类型。它典型为对 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">long</span></span></span> 的 typedef 。</p>
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<p>它用于表示从流位置（ <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 类型值）的偏移。某些 I/O 库函数亦用值为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</span></span></span> 的 <code>std::streamoff</code> 表示错误条件。</p>
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<h3><span class="mw-headline" id=".E4.B8.8E_std::fpos_.E7.9A.84.E5.85.B3.E7.B3.BB">与 std::fpos 的关系</span></h3>
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<ul>
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<li>二个 <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 对象间的差是 <span class="t-lc"><strong class="selflink">std::streamoff</strong></span> 类型值</li>
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<li><span class="t-lc"><strong class="selflink">std::streamoff</strong></span> 类型值可以从 <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 增加或减去，产出不同的 <span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 。</li>
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<ul>
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<li><span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 类型值可隐式转换为 <span class="t-lc"><strong class="selflink">std::streamoff</strong></span> （转换结果为从文件开始的偏移）。</li>
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<li><span class="t-lc"><a href="cpp-io-fpos.html">std::fpos</a></span> 类型值可从 <span class="t-lc"><strong class="selflink">std::streamoff</strong></span> 类型值构造</li>
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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><a href="cpp-io-fpos.html"><span class="t-lines"><span>fpos</span></span></a></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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<div><a href="cpp-io-basic_istream-seekg.html"><span class="t-lines"><span>seekg</span></span></a></div>
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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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<div><a href="cpp-io-basic_ostream-seekp.html"><span class="t-lines"><span>seekp</span></span></a></div>
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</div>
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<td>设置输出位置指示器<br />
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<span class="t-mark">(<code>std::basic_ostream<CharT,Traits></code> 的公开成员函数)</span></td>
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