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 // UNSUPPORTED: libcpp-no-concepts 11 12 // <functional> 13 14 // ranges::not_equal_to 15 16 #include <functional> 17 #include <type_traits> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "compare_types.h" 22 #include "MoveOnly.h" 23 #include "pointer_comparison_test_helper.h" 24 25 struct NotEqualityComparable { 26 friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&); 27 friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete; 28 }; 29 30 static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>); 31 static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>); 32 static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>); 33 34 static_assert(requires { typename std::ranges::not_equal_to::is_transparent; }); 35 36 struct PtrAndNotEqOperator { 37 constexpr operator void*() const { return nullptr; } 38 // We *don't* want operator!= to be picked here. 39 friend constexpr bool operator!=(PtrAndNotEqOperator, PtrAndNotEqOperator) { return true; } 40 }; 41 42 constexpr bool test() { 43 auto fn = std::ranges::not_equal_to(); 44 45 assert(fn(MoveOnly(41), MoveOnly(42))); 46 47 // These are the opposite of other tests. 48 ForwardingTestObject a; 49 ForwardingTestObject b; 50 assert(fn(a, b)); 51 assert(!fn(std::move(a), std::move(b))); 52 53 assert(fn(1, 2)); 54 assert(!fn(2, 2)); 55 assert(fn(2, 1)); 56 57 assert(fn(2, 1L)); 58 59 // Make sure that "ranges::equal_to(x, y) == !ranges::not_equal_to(x, y)", even here. 60 assert(!fn(PtrAndNotEqOperator(), PtrAndNotEqOperator())); 61 assert(std::ranges::equal_to()(PtrAndNotEqOperator(), PtrAndNotEqOperator())); 62 63 return true; 64 } 65 66 int main(int, char**) { 67 68 test(); 69 static_assert(test()); 70 71 // test total ordering of int* for not_equal_to<int*> and not_equal_to<void>. 72 do_pointer_comparison_test(std::ranges::not_equal_to()); 73 74 return 0; 75 } 76