| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // template<class I, class R = ranges::less, class P = identity> |
| // concept sortable = see below; // since C++20 |
| |
| #include <iterator> |
| |
| #include <functional> |
| |
| using CompInt = bool(*)(int, int); |
| using CompDefault = std::ranges::less; |
| |
| using AllConstraintsSatisfied = int*; |
| static_assert( std::permutable<AllConstraintsSatisfied>); |
| static_assert( std::indirect_strict_weak_order<CompDefault, AllConstraintsSatisfied>); |
| static_assert( std::sortable<AllConstraintsSatisfied>); |
| static_assert( std::indirect_strict_weak_order<CompInt, AllConstraintsSatisfied>); |
| static_assert( std::sortable<AllConstraintsSatisfied, CompInt>); |
| |
| struct Foo {}; |
| using Proj = int(*)(Foo); |
| static_assert( std::permutable<Foo*>); |
| static_assert(!std::indirect_strict_weak_order<CompDefault, Foo*>); |
| static_assert( std::indirect_strict_weak_order<CompDefault, std::projected<Foo*, Proj>>); |
| static_assert(!std::sortable<Foo*, CompDefault>); |
| static_assert( std::sortable<Foo*, CompDefault, Proj>); |
| static_assert(!std::indirect_strict_weak_order<CompInt, Foo*>); |
| static_assert( std::indirect_strict_weak_order<CompInt, std::projected<Foo*, Proj>>); |
| static_assert(!std::sortable<Foo*, CompInt>); |
| static_assert( std::sortable<Foo*, CompInt, Proj>); |
| |
| using NotPermutable = const int*; |
| static_assert(!std::permutable<NotPermutable>); |
| static_assert( std::indirect_strict_weak_order<CompInt, NotPermutable>); |
| static_assert(!std::sortable<NotPermutable, CompInt>); |
| |
| struct Empty {}; |
| using NoIndirectStrictWeakOrder = Empty*; |
| static_assert( std::permutable<NoIndirectStrictWeakOrder>); |
| static_assert(!std::indirect_strict_weak_order<CompInt, NoIndirectStrictWeakOrder>); |
| static_assert(!std::sortable<NoIndirectStrictWeakOrder, CompInt>); |