std::experimental::ranges::Sortable
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                    < cpp | experimental | ranges
                    
                                                            
                    |   template <class I, class R = ranges::less<>, class P = ranges::identity> concept bool Sortable =  | 
(范围 TS) | |
Sortable 概念指定将序列排列成有序序列的算法(例如 ranges::sort )的常用要求。