| // Copyright (C) 2019-2021 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 <functional> |
| #include <testsuite_hooks.h> |
| |
| // C++20 [range.cmp] |
| |
| using F = std::ranges::greater; |
| static_assert( std::is_default_constructible_v<F> ); |
| static_assert( std::is_copy_constructible_v<F> ); |
| static_assert( std::is_move_constructible_v<F> ); |
| static_assert( std::is_copy_assignable_v<F> ); |
| static_assert( std::is_move_assignable_v<F> ); |
| |
| static_assert( ! std::is_invocable_v<F> ); |
| static_assert( ! std::is_invocable_v<F, int&> ); |
| static_assert( ! std::is_invocable_v<F, int, void> ); |
| static_assert( ! std::is_invocable_v<F, int, void*> ); |
| static_assert( std::is_nothrow_invocable_r_v<bool, F&, int&, int> ); |
| static_assert( std::is_nothrow_invocable_r_v<bool, F, const long&, char> ); |
| static_assert( std::is_nothrow_invocable_r_v<bool, const F&, short, int&> ); |
| static_assert( std::is_nothrow_invocable_r_v<bool, const F, const char, char> ); |
| |
| using T = F::is_transparent; // required typedef |
| |
| static_assert( ! std::ranges::greater{}(99, 99.0) ); |
| static_assert( std::ranges::greater{}(99.01, 99) ); |
| static_assert( std::ranges::greater{}(990, 140L) ); |
| |
| void |
| test01() |
| { |
| F f; |
| int a[2]{}; |
| VERIFY( ! f(&a, (void*)&a[0]) ); |
| VERIFY( f((void*)&a[1], &a) ); |
| VERIFY( f(&a + 1, (void*)(a + 1)) ); |
| VERIFY( ! f(&a, (void*)(a + 1)) ); |
| } |
| |
| struct X { }; |
| int operator==(X, X) { return 2; } |
| int operator!=(X, X) { return 0; } |
| int operator<(X, X) noexcept { return 0; } |
| int operator>(X, X) { return 0; } |
| int operator<=(X, X) { return 3; } |
| int operator>=(X, X) { return 4; } |
| |
| static_assert( std::is_nothrow_invocable_r_v<bool, F&, X, X> ); |
| |
| void |
| test02() |
| { |
| X x; |
| F f; |
| VERIFY( ! f(x, x) ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| } |