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186+ < span itemprop ="name "> uses_allocator</ span >
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202+ 最終更新日時(UTC):
203+ < span itemprop ="datePublished " content ="2025-01-23T13:40:31 ">
204+ 2025年01月23日 13時40分31秒
205+ </ span >
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209+ </ span >
210+ が更新
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216+ < span class ="fa fa-fw fa-clock-o fa-flip-horizontal "> </ span > 履歴
217+ </ a >
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226+
227+ < div class ="identifier-type "> class template</ div > < div class ="header "> <flat_map></ div > < h1 itemprop ="name "> < span class ="namespace " title ="namespace std "> std::</ span > < span class ="token "> uses_allocator</ span > < span class ="cpp cpp23 " title ="C++23で追加 "> (C++23)</ span > </ h1 >
228+ < div itemprop ="articleBody "> < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="k "> namespace</ span > < span class ="n "> std</ span > < span class ="p "> {</ span >
229+ < span class ="k "> template</ span > < span class ="o "> <</ span > < span class ="k "> class</ span > < span class ="nc "> Key</ span > < span class ="p "> ,</ span > < span class ="k "> class</ span > < span class ="nc "> T</ span > < span class ="p "> ,</ span > < span class ="k "> class</ span > < span class ="nc "> Compare</ span > < span class ="p "> ,</ span > < span class ="k "> class</ span > < span class ="nc "> KeyContainer</ span > < span class ="p "> ,</ span > < span class ="k "> class</ span > < span class ="nc "> MappedContainer</ span > < span class ="p "> ,</ span >
230+ < span class ="k "> class</ span > < span class ="nc "> Alloc</ span > < span class ="o "> ></ span >
231+ < span class ="k "> struct</ span > < span class ="n "> uses_allocator</ span > < span class ="o "> <</ span > < span class ="n "> flat_map</ span > < span class ="o "> <</ span > < span class ="n "> Key</ span > < span class ="p "> ,</ span > < span class ="n "> T</ span > < span class ="p "> ,</ span > < span class ="n "> Compare</ span > < span class ="p "> ,</ span > < span class ="n "> KeyContainer</ span > < span class ="p "> ,</ span > < span class ="n "> MappedContainer</ span > < span class ="o "> ></ span > < span class ="p "> ,</ span >
232+ < span class ="n "> Alloc</ span > < span class ="o "> ></ span >
233+ < span class ="o "> :</ span > < span class ="n "> < a href ="../../type_traits/bool_constant.html "> bool_constant</ a > </ span > < span class ="o "> <</ span > < span class ="n "> uses_allocator_v</ span > < span class ="o "> <</ span > < span class ="n "> KeyContainer</ span > < span class ="p "> ,</ span > < span class ="n "> Alloc</ span > < span class ="o "> ></ span > < span class ="o "> &&</ span >
234+ < span class ="n "> uses_allocator_v</ span > < span class ="o "> <</ span > < span class ="n "> MappedContainer</ span > < span class ="p "> ,</ span > < span class ="n "> Alloc</ span > < span class ="o "> >></ span > < span class ="p "> {</ span > < span class ="p "> };</ span >
235+ < span class ="p "> }</ span >
236+ </ code > </ pre > </ div >
237+ </ p >
238+ < h2 > 概要</ h2 >
239+ < p > < code > uses_allocator</ code > の、< code > flat_map</ code > に対する特殊化。</ p >
240+ < p > アロケータを指定する< code > flat_map</ code > のコンストラクタにおいて、指定されたアロケータと、< code > KeyContainer</ code > および< code > MappedContainer</ code > が合致するかをチェックするのに使われる。</ p >
241+ < h2 > 例</ h2 >
242+ < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="cp "> #include</ span > < span class ="cpf "> < a href ="../../flat_map.html "> <flat_map></ a > </ span > < span class ="cp "> </ span >
243+ < span class ="cp "> #include</ span > < span class ="cpf "> < a href ="../../iostream.html "> <iostream></ a > </ span > < span class ="cp "> </ span >
244+
245+ < span class ="kt "> int</ span > < span class ="nf "> main</ span > < span class ="p "> ()</ span >
246+ < span class ="p "> {</ span >
247+ < span class ="k "> using</ span > < span class ="n "> fm_t</ span > < span class ="o "> =</ span > < span class ="n "> std</ span > < span class ="o "> ::</ span > < span class ="n "> flat_map</ span > < span class ="o "> <</ span > < span class ="kt "> int</ span > < span class ="p "> ,</ span > < span class ="kt "> int</ span > < span class ="o "> ></ span > < span class ="p "> ;</ span >
248+
249+ < span class ="n "> < a href ="../../iostream/cout.html "> std::cout</ a > </ span > < span class ="o "> <<</ span > < span class ="n "> < span style ="color:#ff0000 "> std::uses_allocator</ span > </ span > < span class ="o "> <</ span > < span class ="n "> fm_t</ span > < span class ="p "> ,</ span > < span class ="n "> < a href ="../../memory/allocator.html "> std::allocator</ a > </ span > < span class ="o "> <</ span > < span class ="kt "> int</ span > < span class ="o "> >>::</ span > < span class ="n "> value</ span > < span class ="o "> <<</ span > < span class ="n "> < a href ="../../ostream/endl.html "> std::endl</ a > </ span > < span class ="p "> ;</ span >
250+ < span class ="p "> }</ span >
251+ </ code > </ pre > </ div >
252+ </ p >
253+ < h3 > 出力</ h3 >
254+ < p > < div class ="codehilite "> < pre > < span > </ span > < code > < span class ="mi "> 1</ span >
255+ </ code > </ pre > </ div >
256+ </ p >
257+ < h2 > バージョン</ h2 >
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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#visual_cpp "> Visual C++</ a > : ??</ li >
267+ </ ul >
268+ < h2 > 参照</ h2 > </ div >
269+
270+ </ div >
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272+ </ div >
273+
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