87 lines
4.2 KiB
HTML
87 lines
4.2 KiB
HTML
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<title>std::streamsize</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_streamsize 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>streamsize</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 id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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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> streamsize<span class="sy4">;</span></span></div>
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<p>类型 <code>std::streamsize</code> 是用于表示 I/O 操作中转移字符数或 I/O 缓冲区大小的有符号整数类型。它被用作 <span class="t-lc"><a href="cpp-types-size_t.html">std::size_t</a></span> 的有符号对应，类似 POSIX 类型 <code>ssize_t</code> 。</p>
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<p>决不使用 <code>std::streamsize</code> 的负值，除了在 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-strstreambuf.html"><span class="kw1752">std::<span class="me2">strstreambuf</span></span></a></span></span> 的构造函数中。</p>
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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">
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<div><a href="cpp-io-basic_istream-gcount.html"><span class="t-lines"><span>gcount</span></span></a></div>
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<td>返回上次无格式输出操作所取走的字符数量<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_istream-ignore.html"><span class="t-lines"><span>ignore</span></span></a></div>
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</td>
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<td>读且取走并舍弃字符，直至发现给定字符<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 class="t-dsc-member-div">
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<div><a href="cpp-io-basic_istream-read.html"><span class="t-lines"><span>read</span></span></a></div>
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</div>
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</td>
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<td>读并取走一块字符<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-write.html"><span class="t-lines"><span>write</span></span></a></div>
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</div>
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</td>
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<td>插入字符块<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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