| 1 | //===----------------------------------------------------------------------===// |
|---|
| 2 | // |
|---|
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
|---|
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
|---|
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
|---|
| 6 | // |
|---|
| 7 | //===----------------------------------------------------------------------===// |
|---|
| 8 | |
|---|
| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
|---|
| 10 | |
|---|
| 11 | // template<class I, class R = ranges::less, class P = identity> |
|---|
| 12 | // concept sortable = see below; // since C++20 |
|---|
| 13 | |
|---|
| 14 | #include <iterator> |
|---|
| 15 | |
|---|
| 16 | #include <functional> |
|---|
| 17 | |
|---|
| 18 | using CompInt = bool(*)(int, int); |
|---|
| 19 | using CompDefault = std::ranges::less; |
|---|
| 20 | |
|---|
| 21 | using AllConstraintsSatisfied = int*; |
|---|
| 22 | static_assert( std::permutable<AllConstraintsSatisfied>); |
|---|
| 23 | static_assert( std::indirect_strict_weak_order<CompDefault, AllConstraintsSatisfied>); |
|---|
| 24 | static_assert( std::sortable<AllConstraintsSatisfied>); |
|---|
| 25 | static_assert( std::indirect_strict_weak_order<CompInt, AllConstraintsSatisfied>); |
|---|
| 26 | static_assert( std::sortable<AllConstraintsSatisfied, CompInt>); |
|---|
| 27 | |
|---|
| 28 | struct Foo {}; |
|---|
| 29 | using Proj = int(*)(Foo); |
|---|
| 30 | static_assert( std::permutable<Foo*>); |
|---|
| 31 | static_assert(!std::indirect_strict_weak_order<CompDefault, Foo*>); |
|---|
| 32 | static_assert( std::indirect_strict_weak_order<CompDefault, std::projected<Foo*, Proj>>); |
|---|
| 33 | static_assert(!std::sortable<Foo*, CompDefault>); |
|---|
| 34 | static_assert( std::sortable<Foo*, CompDefault, Proj>); |
|---|
| 35 | static_assert(!std::indirect_strict_weak_order<CompInt, Foo*>); |
|---|
| 36 | static_assert( std::indirect_strict_weak_order<CompInt, std::projected<Foo*, Proj>>); |
|---|
| 37 | static_assert(!std::sortable<Foo*, CompInt>); |
|---|
| 38 | static_assert( std::sortable<Foo*, CompInt, Proj>); |
|---|
| 39 | |
|---|
| 40 | using NotPermutable = const int*; |
|---|
| 41 | static_assert(!std::permutable<NotPermutable>); |
|---|
| 42 | static_assert( std::indirect_strict_weak_order<CompInt, NotPermutable>); |
|---|
| 43 | static_assert(!std::sortable<NotPermutable, CompInt>); |
|---|
| 44 | |
|---|
| 45 | struct Empty {}; |
|---|
| 46 | using NoIndirectStrictWeakOrder = Empty*; |
|---|
| 47 | static_assert( std::permutable<NoIndirectStrictWeakOrder>); |
|---|
| 48 | static_assert(!std::indirect_strict_weak_order<CompInt, NoIndirectStrictWeakOrder>); |
|---|
| 49 | static_assert(!std::sortable<NoIndirectStrictWeakOrder, CompInt>); |
|---|
| 50 | |
|---|
