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214+ 最終更新日時(UTC):
215+ < span itemprop ="datePublished " content ="2025-09-19T01:14:52 ">
216+ 2025年09月19日 01時14分52秒
217+ </ span >
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219+ < span itemprop ="author " itemscope itemtype ="http://schema.org/Person ">
220+ < span itemprop ="name "> yoh</ span >
221+ </ span >
222+ が更新
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228+ < span class ="fa fa-fw fa-clock-o fa-flip-horizontal "> </ span > 履歴
229+ </ a >
230+ < a class ="edit " target ="_blank " href ="https://github.com/cpprefjp/site/edit/master/reference/execution/execution/simple_counting_scope/close.md ">
231+ < span class ="fa fa-fw fa-pencil "> </ span > 編集
232+ </ a >
233+ </ p >
234+ </ div >
235+ </ div >
236+ < div class ="row ">
237+ < div class ="col-sm-12 content-body ">
238+
239+ < div class ="identifier-type "> function</ div > < div class ="header "> <execution></ div > < h1 itemprop ="name "> < span class ="namespace " title ="namespace std::execution "> std::execution::</ span > < span class ="class " title ="class simple_counting_scope "> simple_counting_scope::</ span > < span class ="token "> close</ span > < span class ="cpp cpp26 " title ="C++26で追加 "> (C++26)</ span > </ h1 >
240+ < div itemprop ="articleBody "> < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="kt "> void</ span > < span class ="nf "> close</ span > < span class ="p "> ()</ span > < span class ="k "> noexcept</ span > < span class ="p "> ;</ span >
241+ </ code > </ pre > </ div >
242+ </ p >
243+ < h2 > 概要</ h2 >
244+ < p > 非同期スコープを閉じる。</ p >
245+ < h2 > 効果</ h2 >
246+ < p > 説明用のメンバ変数< code > state</ code > に応じて、</ p >
247+ < ul >
248+ < li > < code > unused</ code > のとき、< code > state</ code > を< code > unused-and-closed</ code > に変更する。</ li >
249+ < li > < code > open</ code > のとき、< code > state</ code > を< code > closed</ code > に変更する。</ li >
250+ < li > < code > open-and-joining</ code > のとき、< code > state</ code > を< code > closed-and-joining</ code > に変更する。</ li >
251+ < li > それ以外のとき、何もしない。</ li >
252+ </ ul >
253+ < 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。Postconditions。関数を実行後に満たされている条件。契約属性の`[[ensures]]`に相当 "> 事後条件</ a > </ h2 >
254+ < p > < code > *this</ code > に対する後続の< code > < a href ="try-associate.html "> try-associate</ a > </ code > は< code > false</ code > を返す。</ p >
255+ < 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 >
256+ < p > 投げない</ p >
257+ < h2 > バージョン</ h2 >
258+ < h3 > 言語</ h3 >
259+ < ul >
260+ < li > C++26</ li >
261+ </ ul >
262+ < h3 > 処理系</ h3 >
263+ < ul >
264+ < li > < a href ="../../../../implementation.html#clang "> Clang</ a > : ??</ li >
265+ < li > < a href ="../../../../implementation.html#gcc "> GCC</ a > : ??</ li >
266+ < li > < a href ="../../../../implementation.html#icc "> ICC</ a > : ??</ li >
267+ < li > < a href ="../../../../implementation.html#visual_cpp "> Visual C++</ a > : ??</ li >
268+ </ ul >
269+ < h2 > 参照</ h2 >
270+ < ul >
271+ < li > < a href ="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3149r11.html " target ="_blank "> P3149R11 < code > async_scope</ code > - Creating scopes for non-sequential concurrency</ a > </ li >
272+ </ ul > </ div >
273+
274+ </ div >
275+ </ div >
276+ </ div >
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