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::equal_to 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 NotEqualityComparable { 25 friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&); 26 friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete; 27 }; 28 29 static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>); 30 static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>); 31 static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>); 32 33 static_assert(requires { typename std::ranges::equal_to::is_transparent; }); 34 35 constexpr bool test() { 36 auto fn = std::ranges::equal_to(); 37 38 assert(fn(MoveOnly(42), MoveOnly(42))); 39 40 ForwardingTestObject a; 41 ForwardingTestObject b; 42 assert(!fn(a, b)); 43 assert(fn(std::move(a), std::move(b))); 44 45 assert(!fn(1, 2)); 46 assert(!fn(2, 1)); 47 assert(fn(2, 2)); 48 49 assert(!fn(2, 1L)); 50 51 return true; 52 } 53 54 int main(int, char**) { 55 56 test(); 57 static_assert(test()); 58 59 // test total ordering of int* for equal_to<int*> and equal_to<void>. 60 do_pointer_comparison_test(std::ranges::equal_to()); 61 62 return 0; 63 } 64