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<div class="identifier-type">function template</div><div class="header"><tuple></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">apply</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="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">F</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Tuple</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../../lang/cpp14/decltype_auto.html">decltype(auto)</a></span>
<span class="w"> </span><span class="n">apply</span><span class="p">(</span><span class="n">F</span><span class="o">&&</span><span class="w"> </span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++20</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">F</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="tuple-like.html">tuple-like</a></span><span class="w"> </span><span class="n">Tuple</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../../lang/cpp14/decltype_auto.html">decltype(auto)</a></span>
<span class="w"> </span><span class="n">apply</span><span class="p">(</span><span class="n">F</span><span class="o">&&</span><span class="w"> </span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">(</span><span class="n"><i>see below</i></span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++23</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">F</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="tuple-like.html">tuple-like</a></span><span class="w"> </span><span class="n">Tuple</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../type_traits/apply_result.html">apply_result_t</a></span><span class="o"><</span><span class="n">F</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">></span>
<span class="w"> </span><span class="n">apply</span><span class="p">(</span><span class="n">F</span><span class="o">&&</span><span class="w"> </span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">)</span>
<span class="w"> </span><span class="k">noexcept</span><span class="p">(</span><span class="n"><a href="../type_traits/is_nothrow_applicable.html">is_nothrow_applicable_v</a></span><span class="o"><</span><span class="n">F</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">></span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++26</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>タプルを展開し、関数の引数に適用してその関数を実行する。</p>
<h2>要件</h2>
<p>適用先の関数は<code><a href="../concepts/Callable.html">Callable</a></code>要件を満たす（<a href="../concepts/Invoke.html">INVOKE</a>操作が可能）。展開される<code>Tuple</code>型は<code><a href="../tuple.html">std::tuple</a></code>に限定されず、<code><a href="../array/array.html">std::array</a></code>または<code><a href="../utility/pair.html">std::pair</a></code>のように、<code><a href="../array/array/get.html">std::get</a></code>と<code><a href="../array/array/tuple_size.html">std::tuple_size</a></code>をサポートする型であればよい。（C++20 まで。）C++23 では<code><a href="tuple-like.html">tuple-like</a></code>による制約が追加されたため、使用できる型は狭まった。（<code><a href="tuple-like.html">tuple-like</a></code>参照）</p>
<h2>効果</h2>
<p>次のような関数があるとき、</p>
<p><div class="codehilite"><pre><span></span><code><span class="c1">// C++17</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">F</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Tuple</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="p">...</span><span class="w"> </span><span class="n">I</span><span class="o">></span>
<span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../../lang/cpp14/decltype_auto.html">decltype(auto)</a></span><span class="w"> </span><span class="n">apply</span><span class="o">-</span><span class="n">impl</span><span class="p">(</span><span class="n">F</span><span class="o">&&</span><span class="w"> </span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../utility/index_sequence.html">std::index_sequence</a></span><span class="o"><</span><span class="n">I</span><span class="p">...</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n"><a href="../functional/invoke.html">std::invoke</a></span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">F</span><span class="o">></span><span class="p">(</span><span class="n">f</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="tuple/get.html">std::get</a></span><span class="o"><</span><span class="n">I</span><span class="o">></span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">></span><span class="p">(</span><span class="n">t</span><span class="p">))...);</span>
<span class="p">}</span>
<span class="c1">// C++23</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">F</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="tuple.html">tuple</a></span><span class="o">-</span><span class="n">like</span><span class="w"> </span><span class="n">Tuple</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="p">...</span><span class="w"> </span><span class="n">I</span><span class="o">></span>
<span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../../lang/cpp14/decltype_auto.html">decltype(auto)</a></span><span class="w"> </span><span class="n">apply</span><span class="o">-</span><span class="n">impl</span><span class="p">(</span><span class="n">F</span><span class="o">&&</span><span class="w"> </span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">Tuple</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../utility/index_sequence.html">std::index_sequence</a></span><span class="o"><</span><span class="n">I</span><span class="p">...</span><span class="o">></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n"><a href="../functional/invoke.html">std::invoke</a></span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">F</span><span class="o">></span><span class="p">(</span><span class="n">f</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="tuple/get.html">std::get</a></span><span class="o"><</span><span class="n">I</span><span class="o">></span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">></span><span class="p">(</span><span class="n">t</span><span class="p">))...);</span>
<span class="p">}</span>
</code></pre></div>
</p>
<p>C++17 : 次と等価である。</p>
<p><div class="codehilite"><pre><span></span><code><span class="k">return</span><span class="w"> </span><span class="n">apply</span><span class="o">-</span><span class="n">impl</span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">F</span><span class="o">></span><span class="p">(</span><span class="n">f</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">></span><span class="p">(</span><span class="n">t</span><span class="p">),</span>
<span class="w"> </span><span class="n"><a href="../utility/make_index_sequence.html">std::make_index_sequence</a></span><span class="o"><</span><span class="n"><a href="tuple_size.html">std::tuple_size_v</a></span><span class="o"><</span><span class="n"><a href="../type_traits/decay.html">std::decay_t</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">>>></span><span class="p">{});</span>
</code></pre></div>
</p>
<p>C++20 : 次と等価である。</p>
<p><div class="codehilite"><pre><span></span><code><span class="k">return</span><span class="w"> </span><span class="n">apply</span><span class="o">-</span><span class="n">impl</span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">F</span><span class="o">></span><span class="p">(</span><span class="n">f</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">></span><span class="p">(</span><span class="n">t</span><span class="p">),</span>
<span class="w"> </span><span class="n"><a href="../utility/make_index_sequence.html">std::make_index_sequence</a></span><span class="o"><</span><span class="n"><a href="tuple_size.html">std::tuple_size_v</a></span><span class="o"><</span><span class="n"><a href="../type_traits/remove_reference.html">std::remove_reference_t</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">>>></span><span class="p">{});</span>
</code></pre></div>
</p>
<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
<p>適用した関数呼び出しの<a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></p>
<h2><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a></h2>
<ul>
<li>C++23から : <code>I</code>をパラメータパック<code>0, 1, ..., (<a href="tuple_size.html">tuple_size_v</a><<a href="../type_traits/remove_reference.html">remove_reference_t</a><Tuple>>-1)</code>としたとき、<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>指定の式は次と等価 : <code>noexcept(<a href="../functional/invoke.html">invoke</a>(std::forward<F>(f), get<I>(std::forward<Tuple>(t))...))</code></li>
<li>C++26から : <a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>指定は<code><a href="../type_traits/is_nothrow_applicable.html">is_nothrow_applicable_v</a><F, Tuple></code></li>
</ul>
<h2>例</h2>
<p><div class="yata" id="0f83f52f54ed195ecb53102f37878b2e2bdac638"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../tuple.html"><tuple></a></span>
<span class="cp">#include <a href="../string.html"><string></a></span>
<span class="kt">void</span><span class="w"> </span><span class="nf">f</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">b</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="w"> </span><span class="n">c</span><span class="p">)</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">a</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="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">b</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="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">c</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="p">}</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="tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="o">></span><span class="w"> </span><span class="n">args</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mf">3.14</span><span class="p">,</span><span class="w"> </span><span class="s">"hello"</span><span class="p">);</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::apply</span></span><span class="p">(</span><span class="n">f</span><span class="p">,</span><span class="w"> </span><span class="n">args</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>1
3.14
hello
</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>: 3.9.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 7.1.0 <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>関連項目</h2>
<ul>
<li><code><a href="make_from_tuple.html">make_from_tuple</a></code></li>
<li><code><a href="../tuple.html">std::tuple</a></code></li>
<li><a href="../concepts/Invoke.html">INVOKE</a></li>
<li><code><a href="tuple-like.html">tuple-like</a></code></li>
<li><code><a href="../type_traits/apply_result.html">apply_result</a></code></li>
<li><code><a href="../type_traits/is_applicable.html">is_applicable</a></code></li>
<li><code><a href="../type_traits/is_nothrow_applicable.html">is_nothrow_applicable</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3802.pdf" target="_blank">N3802 <code>apply()</code> call a function with arguments from a tuple</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3829.pdf" target="_blank">N3829 <code>apply()</code> call a function with arguments from a tuple (V2)</a></li>
<li><a href="http://isocpp.org/files/papers/N3915.pdf" target="_blank">N3915 <code>apply()</code> call a function with arguments from a tuple (V3)</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r0.html" target="_blank">P0220R0 Adopt Library Fundamentals TS for C++17</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_blank">P0220R1 Adopt Library Fundamentals V1 TS Components for C++17 (R1)</a></li>
<li><a href="https://faithandbrave.hateblo.jp/entry/2016/08/18/184315" target="_blank">C++1z タプルを展開して関数呼び出しするapply関数 - Faith and Brave - C++で遊ぼう</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf" target="_blank">P0777R1 Treating Unnecessary <code>decay</code></a><ul>
<li>C++20から効果説明の<code>decay_t</code>を<code>remove_cvref_t</code>へ変更。</li>
</ul>
</li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2517r1.html" target="_blank">P2517R1 Add a conditional <code>noexcept</code> specification to <code>std::apply</code></a><ul>
<li>C++23から条件付きで<code>noexcept</code><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>指定が行われる。</li>
</ul>
</li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p1317r2.pdf" target="_blank">P1317R2 Remove return type deduction in <code>std::apply</code></a><ul>
<li>C++26から<a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a>型が<code>decltype(auto)</code>から<code>apply_result_t<F, Tuple></code>に変更され、SFINAEフレンドリーになった。</li>
</ul>
</li>
</ul></div>
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