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<div class="header"><queue></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class priority_queue">priority_queue::</span><span class="token">推論補助</span><span class="cpp cpp17" title="C++17で追加">(C++17)</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="c1">// 説明用の型</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="o">></span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">iter_val_t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="../../iterator/iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">InputIterator</span><span class="o">>::</span><span class="n">value_type</span><span class="p">;</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Container</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">Compare</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">Container</span><span class="o">::</span><span class="n">value_type</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (1)</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../../functional/less.html">less</a></span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">>></span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Container</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">>>></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Compare</span><span class="p">(),</span><span class="w"> </span><span class="n">Container</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Container</span><span class="p">())</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (2)</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n"><a href="../../ranges/input_range.html">ranges::input_range</a></span><span class="w"> </span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../../functional/less.html">less</a></span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">>>></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n"><a href="../../ranges/from_range_t.html">from_range_t</a></span><span class="p">,</span><span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Compare</span><span class="p">())</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../vector/vector.html">vector</a></span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">>></span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (3) C++23から</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Container</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">Compare</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">Container</span><span class="o">::</span><span class="n">value_type</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (4)</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../vector/vector.html">vector</a></span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../functional/less.html">less</a></span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">>>></span><span class="p">;</span><span class="w"> </span><span class="c1">// (5) C++23から</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../vector/vector.html">vector</a></span><span class="o"><</span><span class="n">iter_val_t</span><span class="o"><</span><span class="n">InputIterator</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (6) C++23から</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Container</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">Container</span><span class="o">::</span><span class="n">value_type</span><span class="p">,</span><span class="w"> </span><span class="n">Container</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (7) C++23から</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n"><a href="../../ranges/input_range.html">ranges::input_range</a></span><span class="w"> </span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Compare</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n"><a href="../../ranges/from_range_t.html">from_range_t</a></span><span class="p">,</span><span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="p">,</span><span class="w"> </span><span class="n">Compare</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../vector/vector.html">vector</a></span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n">Compare</span><span class="o">></span><span class="p">;</span><span class="w"> </span><span class="c1">// (8) C++23から</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n"><a href="../../ranges/input_range.html">ranges::input_range</a></span><span class="w"> </span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n">priority_queue</span><span class="p">(</span><span class="n"><a href="../../ranges/from_range_t.html">from_range_t</a></span><span class="p">,</span><span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="p">)</span>
<span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">priority_queue</span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../../vector/vector.html">vector</a></span><span class="o"><</span><span class="n"><a href="../../ranges/range_value_t.html">ranges::range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="o">>></span><span class="p">;</span><span class="w"> </span><span class="c1">// (9) C++23から</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>std::priority_queue</code>クラステンプレートの型推論補助。</p>
<ul>
<li>(1) : 比較関数オブジェクトと、元となるコンテナから推論する</li>
<li>(2) : <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a>、比較関数オブジェクト、元となるコンテナから推論する</li>
<li>(3) : Rangeと比較関数オブジェクトから推論する</li>
<li>(4) : 比較関数オブジェクトと、元となるコンテナ、アロケータから推論する</li>
<li>(5) : <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a>とアロケータから推論する</li>
<li>(6) : <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a>、比較関数オブジェクト、アロケータから推論する</li>
<li>(7) : <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a>、比較関数オブジェクト、元となるコンテナ、アロケータから推論する</li>
<li>(8) : Range、比較関数オブジェクト、元となるコンテナから推論する</li>
<li>(9) : Rangeとアロケータから推論する</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Mandates。満たさなければプログラムが不適格となる要件。この要件は、オーバーロード解決によって選択された関数内での`static_assert`の定数条件式や、関数に対するdelete宣言などで表現できる">適格要件</a></h2>
<p>以下のいずれかの条件を満たす場合、<a class="cpprefjp-defined-word" data-desc="コンテナをラップしたクラス。一部のコンテナインタフェースをもたない場合がある">コンテナアダプタ</a>の推論補助は<a class="cpprefjp-defined-word" data-desc="関数呼び出し時に、同名の関数の中から実際に呼び出す関数を決定する処理。このときの候補になることを、オーバーロード解決に参加するという">オーバーロード解決</a>に参加しない：</p>
<ul>
<li><code>InputIterator</code>テンプレートパラメータをもち、入力イテレータの要件を満たさない型が推論された場合</li>
<li><code>Compare</code>テンプレートパラメータをもち、アロケータとして<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../../../implementation-compliance.html#dfn-well-formed">適格</a>な型が推論された場合 (C++23)</li>
<li><code>Container</code>テンプレートパラメータをもち、アロケータとして<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../../../implementation-compliance.html#dfn-well-formed">適格</a>な型が推論された場合 (C++23)</li>
<li><code>Container</code>テンプレートパラメータをもたず、<code>Allocator</code>テンプレートパラメータをもち、アロケータとして<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../../../implementation-compliance.html#dfn-well-formed">適格</a>でない型が推論された場合 (C++23)</li>
<li><code>Container</code>と<code>Allocator</code>の両方のテンプレートパラメータをもち、<code><a href="../../memory/uses_allocator.html">uses_allocator_v</a><Container, Allocator></code>が<code>false</code>の場合</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="64a1536910cf1d3dd82c24b374b96c180d93a300"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../queue.html"><queue></a></span>
<span class="cp">#include <a href="../../type_traits.html"><type_traits></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="n"><a href="../../vector/vector.html">std::vector</a></span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// (1)</span>
<span class="w"> </span><span class="c1">// 比較関数オブジェクトと、元となるコンテナから推論</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">priority_queue</span><span class="w"> </span><span class="n">pque1</span><span class="w"> </span><span class="p">{</span><span class="n"><a href="../../functional/less.html">std::less</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">(),</span><span class="w"> </span><span class="n">v</span><span class="p">};</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n"><a href="../../type_traits/is_same.html">std::is_same_v</a></span><span class="o"><</span><span class="k">decltype</span><span class="p">(</span><span class="n">pque1</span><span class="p">),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">priority_queue</span><span class="o"><</span><span class="kt">int</span><span class="o">>></span><span class="p">);</span>
<span class="w"> </span><span class="c1">// (2)</span>
<span class="w"> </span><span class="c1">// イテレータ範囲から推論 (デフォルトのコンテナを使用する)</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">priority_queue</span><span class="w"> </span><span class="n">pque2</span><span class="w"> </span><span class="p">{</span><span class="n"><a href="../../vector/vector/begin.html">v.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../vector/vector/end.html">v.end()</a></span><span class="p">};</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n"><a href="../../type_traits/is_same.html">std::is_same_v</a></span><span class="o"><</span><span class="k">decltype</span><span class="p">(</span><span class="n">pque2</span><span class="p">),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">priority_queue</span><span class="o"><</span><span class="kt">int</span><span class="o">>></span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code></code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++17</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>:</li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../../lang/cpp17/type_deduction_for_class_templates.html">C++17 クラステンプレートのテンプレート引数推論</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0433r2.html" target="_blank">P0433R2 Toward a resolution of US7 and US14: Integrating template deduction for class templates into the standard library</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1518r2.html" target="_blank">P1518R2 Stop Overconstraining Allocators in Container Deduction Guides</a><ul>
<li>C++23での推論補助の制約についての変更</li>
</ul>
</li>
</ul></div>
</div>
</div>
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