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108 lines
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<title>C++ 具名要求：随机数引擎适配器 (RandomNumberEngineAdaptor)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">C++ 具名要求：</span><span style="font-style:italic">随机数引擎适配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngineAdaptor)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-named_req.html">named req</a></span></div>
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<p><strong class="selflink"><span style="font-style:italic">随机数引擎适配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngineAdaptor)</span></strong> 是变换另一<a href="cpp-named_req-RandomNumberEngine.html"><span style="font-style:italic">随机数引擎</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngine)</span></a> 输出的<a href="cpp-named_req-RandomNumberEngine.html"><span style="font-style:italic">随机数引擎</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngine)</span></a> ，前者被称为<i>基引擎</i>。</p>
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<h3><span class="mw-headline" id=".E8.A6.81.E6.B1.82">要求</span></h3>
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<p>给定</p>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> ，<a href="cpp-named_req-RandomNumberEngine.html"><span style="font-style:italic">随机数引擎</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngine)</span></a></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">b</span></span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 类型对象</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> ，适配 <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 为基引擎的<span style="font-style:italic">随机数引擎适配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngineAdaptor)</span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">a</span></span> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 类型对象</li>
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</ul>
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<table class="wikitable">
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<tr>
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<th>函数</th>
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<th>语义</th>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">A<span class="sy4">::</span><span class="me2">A</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>如同以其默认构造函数初始化基引擎。</td>
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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> A<span class="sy3">&</span> lhs, <span class="kw4">const</span> A<span class="sy3">&</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs</span></span> 的基引擎是否等于 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs</span></span> 的基引擎</td>
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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">A<span class="sy4">::</span><span class="me2">A</span><span class="br0">(</span>result_type s<span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>以 <span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span> 初始化基引擎。</td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Sseq<span class="sy1">></span> A<span class="sy4">::</span><span class="me2">A</span><span class="br0">(</span>Sseq<span class="sy3">&</span> q<span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>以 <span class="t-c"><span class="mw-geshi cpp source-cpp">q</span></span> 初始化基引擎。</td>
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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> seed<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">b.<span class="me1">seed</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</td>
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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> seed<span class="br0">(</span>result_type s<span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">b.<span class="me1">seed</span><span class="br0">(</span>s<span class="br0">)</span></span></span> 。</td>
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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Sseq<span class="sy1">></span> <span class="kw4">void</span> seed<span class="br0">(</span>Sseq<span class="sy3">&</span> q<span class="br0">)</span><span class="sy4">;</span></span></span></td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">b.<span class="me1">seed</span><span class="br0">(</span>q<span class="br0">)</span></span></span> 。</td>
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</tr>
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</table>
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<p>还有</p>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 的每个函数的复杂度不超出 <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 的对应函数的复杂度</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 的状态包含 <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 的状态</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 的状态大小不小于 <span class="t-c"><span class="mw-geshi cpp source-cpp">b</span></span> 的大小</li>
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<li>复制 <span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 的状态包含复制 <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 的状态</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">A</span></span> 的文本表示包含 <span class="t-c"><span class="mw-geshi cpp source-cpp">B</span></span> 的文本表示</li>
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</ul>
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<h3><span class="mw-headline" id=".E6.A0.87.E5.87.86.E5.BA.93">标准库</span></h3>
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<p>下列标准库设施满足<span style="font-style:italic">随机数引擎适配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(RandomNumberEngineAdaptor)</span> ：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-numeric-random-discard_block_engine.html"><span class="t-lines"><span>discard_block_engine</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>舍弃随机数引擎的某些输出<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-numeric-random-independent_bits_engine.html"><span class="t-lines"><span>independent_bits_engine</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>将一个随机数引擎的输出打包为指定位数的块<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-numeric-random-shuffle_order_engine.html"><span class="t-lines"><span>shuffle_order_engine</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>以不同顺序发送一个随机数引擎的输出<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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