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<div class="identifier-type">class template</div><div class="header"><random></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">seed_seq</span><span class="cpp cpp11" title="C++11で追加">(C++11)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">seed_seq</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>seed_seq</code>クラスは、擬似乱数を生成するためのシード列を表現するためのクラスである。<br />
シード列は、32ビット整数の<code><a href="../vector.html">vector</a></code>として表現される。</p>
<p>擬似乱数は一つの値をシードとして使用することもできるが、より多くの乱雑さ(エントロピー)が必要な場合に、複数のシードで擬似乱数を初期化するためにこのクラスを使用する。</p>
<h2>メンバ関数</h2>
<h3>構築</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="seed_seq/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++11</td>
</tr>
<tr>
<td><code>~seed_seq() = default;</code></td>
<td>デストラクタ</td>
<td>C++11</td>
</tr>
<tr>
<td><code>void operator=(const seed_seq&) = delete;</code></td>
<td>代入演算子。代入不可</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>生成</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="seed_seq/generate.html">generate</a></code></td>
<td>シード列を生成する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>特性</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="seed_seq/size.html">size</a></code></td>
<td>シード列の要素数を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="seed_seq/param.html">param</a></code></td>
<td>シード列を取得する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>メンバ型</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>型</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>result_type</code></td>
<td>シードを表す整数型 <code><a href="../cstdint/uint_least32_t.html">uint_least32_t</a></code>。</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p>以下は、メルセンヌ・ツイスター法による擬似乱数生成器を、状態シーケンスのサイズ分のシード列で初期化する例である。</p>
<p><div class="yata" id="86af7fe7adc4fa3dbff20d5106cc130b56ae8fba"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../array.html"><array></a></span>
<span class="cp">#include <a href="../algorithm.html"><algorithm></a></span>
<span class="cp">#include <a href="../functional.html"><functional></a></span>
<span class="cp">#include <a href="../random.html"><random></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// 擬似乱数生成器の状態シーケンスのサイズ分、</span>
<span class="w"> </span><span class="c1">// シードを用意する</span>
<span class="w"> </span><span class="n"><a href="../array/array.html">std::array</a></span><span class="o"><</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::seed_seq</span></span><span class="o">::</span><span class="n">result_type</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="mt19937.html">std::mt19937</a></span><span class="o">::</span><span class="n">state_size</span>
<span class="w"> </span><span class="o">></span><span class="w"> </span><span class="n">seed_data</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 非決定的な乱数でシード列を構築する</span>
<span class="w"> </span><span class="n"><a href="random_device.html">std::random_device</a></span><span class="w"> </span><span class="n">seed_gen</span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../algorithm/generate.html">std::generate</a></span><span class="p">(</span><span class="n"><a href="../array/array/begin.html">seed_data.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../array/array/end.html">seed_data.end()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../functional/ref.html">std::ref</a></span><span class="p">(</span><span class="n">seed_gen</span><span class="p">));</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::seed_seq</span></span><span class="w"> </span><span class="n">seq</span><span class="p">(</span><span class="n"><a href="../array/array/begin.html">seed_data.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../array/array/end.html">seed_data.end()</a></span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 擬似乱数生成器をシード列で初期化</span>
<span class="w"> </span><span class="n"><a href="mt19937.html">std::mt19937</a></span><span class="w"> </span><span class="n">engine</span><span class="p">(</span><span class="n">seq</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 乱数生成</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">10</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../cstdint/uint32_t.html">std::uint32_t</a></span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="mersenne_twister_engine/op_call.html">engine()</a></span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例</h3>
<p><pre><code>2454004218
3605965574
154830518
2773897806
2068951439
2231513109
607824
726899798
1108321733
2723491878
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.7.2 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://stackoverflow.com/questions/15509270/does-stdmt19937-require-warmup" target="_blank">Does std::mt19937 require warmup? - StackOverflow</a></li>
<li><a href="http://stackoverflow.com/questions/16078794/mersenne-twister-warm-up-vs-reproducibility" target="_blank">Mersenne twister warm up vs. reproducibility</a></li>
</ul></div>
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