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202+ 最終更新日時(UTC):
203+ < span itemprop ="datePublished " content ="2025-08-29T15:37:44 ">
204+ 2025年08月29日 15時37分44秒
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210+ が更新
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219+ < span class ="fa fa-fw fa-pencil "> </ span > 編集
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227+ < div class ="identifier-type "> function template</ div > < div class ="header "> <execution></ div > < h1 itemprop ="name "> < span class ="namespace " title ="namespace std::execution "> std::execution::</ span > < span class ="token "> allocator-aware-forward</ span > < span class ="cpp cpp26 " title ="C++26で追加 "> (C++26)</ span > </ h1 >
228+ < div itemprop ="articleBody "> < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="k "> template</ span > < span class ="o "> <</ span > < span class ="k "> class</ span > < span class ="nc "> T</ span > < span class ="p "> ,</ span > < span class ="k "> class</ span > < span class ="nc "> Context</ span > < span class ="o "> ></ span >
229+ < span class ="n "> < a href ="../../../lang/cpp14/decltype_auto.html "> decltype(auto)</ a > </ span > < span class ="n "> allocator</ span > < span class ="o "> -</ span > < span class ="n "> aware</ span > < span class ="o "> -</ span > < span class ="n "> forward</ span > < span class ="p "> (</ span > < span class ="n "> T</ span > < span class ="o "> &&</ span > < span class ="n "> obj</ span > < span class ="p "> ,</ span > < span class ="n "> Context</ span > < span class ="o "> &&</ span > < span class ="n "> context</ span > < span class ="p "> );</ span >
230+ </ code > </ pre > </ div >
231+ </ p >
232+ < h2 > 概要</ h2 >
233+ < p > < code > allocator-aware-forward</ code > は、Senderアルゴリズム動作仕様定義で用いられる説明専用の関数テンプレートである。</ p >
234+ < p > アロケータの利用可否に応じて、< code > obj</ code > から< code > T</ code > 型の新規オブジェクトを作成するか、< code > obj</ code > を転送する。
235+ < code > context</ code > に関連付けられた< a href ="../queryable.html "> 環境</ a > がアロケータを提供する（つまり、式< code > < a href ="../get_allocator.html "> get_allocator</ a > (< a href ="get_env.html "> get_env</ a > (context))</ code > が有効である）とき、同式の結果を< code > alloc</ code > 、型< code > P</ code > を< code > < a href ="../../type_traits/remove_cvref.html "> remove_cvref_t</ a > <T></ code > とする。</ p >
236+ < 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 >
237+ < ul >
238+ < li > < code > alloc</ code > が定義されなければ、< code > < a href ="../../utility/forward.html "> std::forward</ a > <T>(obj)</ code > を返す。</ li >
239+ < li >
240+ < p > そうではなく、< code > P</ code > が< code > product-type</ code > の特殊化のときは、< code > obj</ code > の要素を< code > e</ code > としたとき各要素が次の通り初期化された< code > P</ code > 型のオブジェクトを返す。</ p >
241+ < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="n "> < a href ="../../memory/make_obj_using_allocator.html "> make_obj_using_allocator</ a > </ span > < span class ="o "> <</ span > < span class ="k "> decltype</ span > < span class ="p "> (</ span > < span class ="n "> e</ span > < span class ="p "> )</ span > < span class ="o "> ></ span > < span class ="p "> (</ span > < span class ="n "> < a href ="../../utility/forward_like.html "> std::forward_like</ a > </ span > < span class ="o "> <</ span > < span class ="n "> T</ span > < span class ="o "> ></ span > < span class ="p "> (</ span > < span class ="n "> e</ span > < span class ="p "> ),</ span > < span class ="n "> alloc</ span > < span class ="p "> )</ span >
242+ </ code > </ pre > </ div >
243+ </ p >
244+ </ li >
245+ < li >
246+ < p > そうでなければ、< code > < a href ="../../memory/make_obj_using_allocator.html "> make_obj_using_allocator</ a > <P>(< a href ="../../utility/forward.html "> std::forward</ a > <T>(e), alloc)</ code > を返す。</ p >
247+ </ li >
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249+ < h2 > バージョン</ h2 >
250+ < h3 > 言語</ h3 >
251+ < ul >
252+ < li > C++26</ li >
253+ </ ul >
254+ < h2 > 関連項目</ h2 >
255+ < ul >
256+ < li > < code > < a href ="impls-for.html "> execution::impls-for</ a > </ code > </ li >
257+ < li > < code > < a href ="let_value.html "> execution::let_value</ a > </ code > </ li >
258+ </ ul >
259+ < h2 > 参照</ h2 >
260+ < ul >
261+ < li > < a href ="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3433r1.pdf0 " target ="_blank "> P3433R1 Allocator Support for Operation States</ a > </ li >
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