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 // <functional> 12 13 // ranges::greater 14 15 #include <functional> 16 #include <type_traits> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "compare_types.h" 21 #include "MoveOnly.h" 22 #include "pointer_comparison_test_helper.h" 23 24 struct NotTotallyOrdered { 25 friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&); 26 }; 27 28 static_assert(!std::is_invocable_v<std::ranges::greater, NotTotallyOrdered, NotTotallyOrdered>); 29 static_assert(!std::is_invocable_v<std::ranges::greater, int, MoveOnly>); 30 static_assert(std::is_invocable_v<std::ranges::greater, explicit_operators, explicit_operators>); 31 32 static_assert(requires { typename std::ranges::greater::is_transparent; }); 33 34 constexpr bool test() { 35 auto fn = std::ranges::greater(); 36 37 assert(fn(MoveOnly(42), MoveOnly(41))); 38 39 ForwardingTestObject a; 40 ForwardingTestObject b; 41 assert(!fn(a, b)); 42 assert(fn(std::move(a), std::move(b))); 43 44 assert(!fn(2, 2)); 45 assert(!fn(1, 2)); 46 assert(fn(2, 1)); 47 48 assert(fn(2, 1L)); 49 50 return true; 51 } 52 53 int main(int, char**) { 54 55 test(); 56 static_assert(test()); 57 58 // test total ordering of int* for greater<int*> and greater<void>. 59 do_pointer_comparison_test(std::ranges::greater()); 60 61 return 0; 62 } 63