123 lines
8.6 KiB
HTML
123 lines
8.6 KiB
HTML
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<title>std::basic_streambuf<CharT,Traits>::setp</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_streambuf<CharT,Traits>::</span>setp</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_streambuf.html">basic streambuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> setp<span class="br0">(</span> char_type<span class="sy2">*</span> pbeg, char_type<span class="sy2">*</span> pend <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>设置定义放置区的指针值。特别是调用后 <span class="t-c"><span class="mw-geshi cpp source-cpp">pbase<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> pbeg</span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">pptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> pbeg</span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">epptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> pend</span></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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<td>pbeg</td>
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<td>-</td>
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<td>指向放置区新起始的指针</td>
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</tr>
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<tr class="t-par">
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<td>pend</td>
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<td>-</td>
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<td>指向放置区新结尾的指针</td>
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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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<p>（无）</p>
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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-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 <array></span>
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<span class="co1">// 以 std::array 实现的 std::ostream 缓冲区</span>
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<span class="kw1">template</span><span class="sy1"><</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> SIZE, <span class="kw1">class</span> CharT <span class="sy1">=</span> <span class="kw4">char</span><span class="sy1">></span>
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<span class="kw1">class</span> ArrayedStreamBuffer <span class="sy4">:</span> <span class="kw1">public</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<span class="sy1">></span>
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<span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw1">using</span> Base <span class="sy1">=</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<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> char_type <span class="sy1">=</span> <span class="kw1">typename</span> Base<span class="sy4">::</span><span class="me2">char_type</span><span class="sy4">;</span>
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ArrayedStreamBuffer<span class="br0">(</span><span class="br0">)</span> <span class="sy4">:</span> buffer_<span class="br0">{</span><span class="br0">}</span> <span class="co1">// 值初始化 buffer_ 为全零</span>
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<span class="br0">{</span>
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Base<span class="sy4">::</span><span class="me2">setp</span><span class="br0">(</span>buffer_.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, buffer_.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 设置 std::basic_streambuf</span>
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<span class="co1">// 放置区指针以 'buffer_' 工作</span>
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<span class="br0">}</span>
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<span class="kw4">void</span> print_buffer<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&</span> i<span class="sy4">:</span> buffer_<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="br0">(</span>i <span class="sy1">==</span> <span class="nu0">0</span><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">"NULL"</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="kw1">else</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> i<span class="sy4">;</span>
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<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">" "</span><span class="sy4">;</span>
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<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">"<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span>char_type, SIZE<span class="sy1">></span> buffer_<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</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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ArrayedStreamBuffer<span class="sy1"><</span><span class="nu0">10</span><span class="sy1">></span> streambuf<span class="sy4">;</span>
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<a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a> stream<span class="br0">(</span><span class="sy3">&</span>streambuf<span class="br0">)</span><span class="sy4">;</span>
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stream <span class="sy1"><<</span> <span class="st0">"hello"</span><span class="sy4">;</span>
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stream <span class="sy1"><<</span> <span class="st0">","</span><span class="sy4">;</span>
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streambuf.<span class="me1">print_buffer</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></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">h e l l o , NULL NULL NULL NULL</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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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_streambuf-setg.html"><span class="t-lines"><span>setg</span></span></a></div>
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</div>
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</td>
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<td>重定位输出序列的起始、下一位置和终止指针<br />
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<span class="t-mark">(受保护成员函数)</span></td>
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