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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">make_from_tuple</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">// C++17</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">T</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">T</span><span class="w"> </span><span class="n">make_from_tuple</span><span class="p">(</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">// C++23</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">T</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">T</span><span class="w"> </span><span class="n">make_from_tuple</span><span class="p">(</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="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code><a href="tuple-like.html">tuple-like</a></code>な型<code>Tuple</code>のオブジェクトに含まれる値から型<code>T</code>のオブジェクトを構築する。</p>
<h2>要件</h2>
<p>型<code>T</code>のコンストラクタの内のいずれか一つが、型<code>Tuple</code>に含まれる全ての型の値をその順番通りに受け入れ可能であること。それができない場合はコンパイルエラーとなる。</p>
<p>また、型<code>T</code>の初期化はそのコンストラクタで行われ集成体初期化は考慮されない。つまり、<code>Tuple</code>に含まれる型が空かただ一つの<code>T</code>でない場合、型<code>T</code>は集成体（aggregate）であってはならない（C++17のみ、C++20以降はok）。</p>
<p>更に、C++23以降は<code>make_from_tuple</code>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>が参照である場合で<a class="cpprefjp-defined-word" data-desc="dangling。寿命が尽きた無効なオブジェクトやメモリ領域を、ポインタ・参照・イテレータなどが指し続けている状態のこと。これらにアクセスすると未定義の動作を引き起こす">ダングリング</a>参照を生成しないために、<code>make_from_tuple</code>の内部で<code>T</code>が構築される際に、<code>Tuple</code>から取得されるオブジェクト（参照の初期化であるので、<code>Tuple</code>のサイズは1である必要がある）の寿命が延長されないことも要求され、これを満たさない場合はコンパイルエラーとなる。
正確には、<code><a href="tuple_size.html">tuple_size_v</a><<a href="../type_traits/remove_reference.html">remove_reference_t</a><Tuple>> == 1</code>である場合、<code><a href="../type_traits/reference_constructs_from_temporary.html">reference_constructs_from_temporary_v</a><T, decltype(get<0>(<a href="../utility/declval.html">declval</a><Tuple>()))> == false</code>であること。</p>
<h2>引数</h2>
<ul>
<li><code>t</code> -- <code><a href="tuple-like.html">tuple-like</a></code>な型<code>Tuple</code>のオブジェクト</li>
</ul>
<p><code><a href="tuple-like.html">tuple-like</a></code>な型とは主に<code><a href="../tuple.html">std::tuple</a></code>の事であるが、<code><a href="../utility/pair.html">std::pair</a></code>や<code><a href="../array/array.html">std::array</a></code>のように<code><a href="../tuple.html">std::tuple</a></code>と同じような扱いができる型も含んでいる。<br />
より詳細には、<code><a href="../array/array/get.html">std::get</a></code>（インデックス指定）と<code><a href="../array/array/tuple_size.html">std::tuple_size</a></code>が適用可能な型である。（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>を参照）</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><code>Tuple</code>に含まれる型の値をその順番通りに型<code>T</code>のコンストラクタに<code><a href="../utility/forward.html">std::forward</a></code>して構築された<code>T</code>のオブジェクト。</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>
<p><code>Tuple</code>に含まれる型の値を受け取る<code>T</code>のコンストラクタが<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>を送出する可能性がある場合は、この関数も<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>を送出しうる。</p>
<h2>備考</h2>
<p>構築したい型<code>T</code>は引数からの推論ができないので、明示的に指定する必要がある。</p>
<p>また、<a href="../../lang/cpp17/guaranteed_copy_elision.html">値のコピー省略保証</a>に対応するコンパイラであれば型<code>T</code>はムーブ可能である必要はない（<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>の<code>T</code>のオブジェクトは呼び出し元で構築される）。</p>
<h2>実装例</h2>
<p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</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="n"><a href="../cstddef/size_t.html">std::size_t</a></span><span class="p">...</span><span class="w"> </span><span class="n">Index</span><span class="o">></span>
<span class="k">constexpr</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="n">make_from_tuple_impl</span><span class="p">(</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">Index</span><span class="p">...</span><span class="o">></span><span class="p">){</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">T</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">get</span><span class="o"><</span><span class="n">Index</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="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</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="k">constexpr</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="n">make_from_tuple</span><span class="p">(</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="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">make_from_tuple_impl</span><span class="o"><</span><span class="n">T</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="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">std</span><span class="o">::</span><span class="n">tuple_size_v</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../type_traits/remove_reference.html">remove_reference_t</a></span><span class="o"><</span><span class="n">Tuple</span><span class="o">>>></span><span class="p">{});</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>例</h2>
<p><div class="yata" id="748c1368b7cb0e75803e1033df46c65f725ce196"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../tuple.html"><tuple></a></span>
<span class="cp">#include <a href="../array.html"><array></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">sample</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">sample</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">int</span><span class="w"> </span><span class="n">b</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">c</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">d</span><span class="p">)</span><span class="w"> </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="s">", "</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="s">", "</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="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">d</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="w"> </span><span class="n">sample</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="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="s">", "</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="p">}</span>
<span class="w"> </span><span class="n">sample</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">a1</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">a2</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">a3</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">a4</span><span class="p">)</span><span class="w"> </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">a1</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a2</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a3</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a4</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="w"> </span><span class="c1">//あらゆるムーブ・コピー操作をdelete</span>
<span class="w"> </span><span class="n">sample</span><span class="p">(</span><span class="n">sample</span><span class="o">&&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="w"> </span><span class="n">sample</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">sample</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="w"> </span><span class="n">sample</span><span class="o">&</span><span class="w"> </span><span class="k">operator</span><span class="o">=</span><span class="p">(</span><span class="n">sample</span><span class="o">&&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="w"> </span><span class="n">sample</span><span class="o">&</span><span class="w"> </span><span class="k">operator</span><span class="o">=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">sample</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</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="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="make_tuple.html">std::make_tuple</a></span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"> </span><span class="mf">20.0</span><span class="p">,</span><span class="w"> </span><span class="s">"Hello world."</span><span class="p">);</span>
<span class="w"> </span><span class="c1">//<a href="tuple.html">std::tuple</a><int, int, double, const char*>からの構築</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">s</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::make_from_tuple</span></span><span class="o"><</span><span class="n">sample</span><span class="o">></span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">t</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../utility/make_pair.html">std::make_pair</a></span><span class="p">(</span><span class="mi">30</span><span class="p">,</span><span class="w"> </span><span class="mf">40.0</span><span class="p">);</span>
<span class="w"> </span><span class="c1">//<a href="../utility/pair.html">std::pair</a><int, double>からの構築</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">s</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::make_from_tuple</span></span><span class="o"><</span><span class="n">sample</span><span class="o">></span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">p</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../array/array.html">std::array</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="mi">4</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="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="mi">4</span><span class="p">};</span>
<span class="w"> </span><span class="c1">//<a href="../array/array.html">std::array</a>からの構築</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">s</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::make_from_tuple</span></span><span class="o"><</span><span class="n">sample</span><span class="o">></span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">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</h3>
<p><pre><code>0, 10, 20, Hello world.
30, 40
1, 2, 3, 4
</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>: 2017 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="apply.html">apply</a></li>
<li><code><a href="tuple-like.html">tuple-like</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://faithandbrave.hateblo.jp/entry/2016/08/19/173946" target="_blank">C++1z タプルを任意の型のオブジェクトに変換するmake_from_tuple関数 - Faith and Brave - C++で遊ぼう</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf" target="_blank">P0209R2 make_from_tuple: apply for construction</a></li>
</ul></div>
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