| // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| #include <list> |
| #include <testsuite_hooks.h> |
| |
| void |
| test01() |
| { |
| std::list<int> c1{ 1, 2, 3 }, c2{ 1, 2, 3, 4 }, c3{ 1, 2, 4 }; |
| VERIFY( c1 == c1 ); |
| VERIFY( std::is_eq(c1 <=> c1) ); |
| VERIFY( c1 < c2 ); |
| VERIFY( std::is_lt(c1 <=> c2) ); |
| VERIFY( c1 < c3 ); |
| VERIFY( std::is_lt(c1 <=> c3) ); |
| VERIFY( c2 < c3 ); |
| VERIFY( std::is_lt(c2 <=> c3) ); |
| |
| static_assert( std::totally_ordered<std::list<int>> ); |
| |
| static_assert( std::three_way_comparable<std::list<int>, |
| std::strong_ordering> ); |
| static_assert( ! std::three_way_comparable<std::list<float>, |
| std::strong_ordering> ); |
| static_assert( ! std::three_way_comparable<std::list<float>, |
| std::weak_ordering> ); |
| static_assert( std::three_way_comparable<std::list<float>, |
| std::partial_ordering> ); |
| |
| struct E |
| { |
| bool operator==(E) { return true; } |
| }; |
| static_assert( ! std::totally_ordered<std::list<E>> ); |
| static_assert( ! std::three_way_comparable<E> ); |
| static_assert( ! std::three_way_comparable<std::list<E>> ); |
| } |
| |
| void |
| test02() |
| { |
| struct W |
| { |
| int value = 0; |
| |
| bool operator==(W rhs) const noexcept |
| { return (value | 1) == (rhs.value | 1); } |
| |
| std::weak_ordering |
| operator<=>(W rhs) const noexcept |
| { return (value | 1) <=> (rhs.value | 1); } |
| }; |
| |
| static_assert( std::totally_ordered<std::list<W>> ); |
| |
| std::list<W> c1{ {1}, {2}, {3} }, c2{ {0}, {3}, {3} }; |
| static_assert( std::same_as<decltype(c1 <=> c1), std::weak_ordering> ); |
| VERIFY( c1 == c2 ); |
| VERIFY( std::is_eq(c1 <=> c2) ); |
| } |
| |
| void |
| test03() |
| { |
| struct P |
| { |
| int value = 0; |
| |
| bool operator==(P rhs) const noexcept |
| { |
| if (value < 0 || rhs.value < 0) |
| return false; |
| return value == rhs.value; |
| } |
| |
| std::partial_ordering |
| operator<=>(P rhs) const noexcept |
| { |
| if (value < 0 || rhs.value < 0) |
| return std::partial_ordering::unordered; |
| return value <=> rhs.value; |
| } |
| }; |
| |
| static_assert( std::totally_ordered<std::list<P>> ); |
| |
| std::list<P> c{ {1}, {2}, {-3} }; |
| static_assert( std::three_way_comparable<P> ); |
| static_assert( std::same_as<decltype(c <=> c), std::partial_ordering> ); |
| VERIFY( (c <=> c) == std::partial_ordering::unordered ); |
| } |
| |
| void |
| test04() |
| { |
| struct L |
| { |
| int value = 0; |
| |
| bool operator<(L rhs) const noexcept { return value < rhs.value; } |
| }; |
| |
| static_assert( std::totally_ordered<std::list<L>> ); |
| |
| std::list<L> c{ {1}, {2}, {3} }, d{ {1}, {2}, {3}, {4} }; |
| static_assert( std::same_as<decltype(c <=> c), std::weak_ordering> ); |
| VERIFY( std::is_lt(c <=> d) ); |
| } |
| |
| static_assert( ! std::totally_ordered<std::list<int>::iterator> ); |
| static_assert( ! std::three_way_comparable<std::list<int>::iterator> ); |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| } |