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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges 12 13 // <functional> 14 15 // ranges::not_equal_to 16 17 #include <functional> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 #include "compare_types.h" 23 #include "MoveOnly.h" 24 #include "pointer_comparison_test_helper.h" 25 26 struct NotEqualityComparable { 27 friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&); 28 friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete; 29 }; 30 31 static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>); 32 static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>); 33 static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>); 34 35 static_assert(requires { typename std::ranges::not_equal_to::is_transparent; }); 36 37 struct PtrAndNotEqOperator { 38 constexpr operator void*() const { return nullptr; } 39 // We *don't* want operator!= to be picked here. 40 friend constexpr bool operator!=(PtrAndNotEqOperator, PtrAndNotEqOperator) { return true; } 41 }; 42 43 constexpr bool test() { 44 auto fn = std::ranges::not_equal_to(); 45 46 assert(fn(MoveOnly(41), MoveOnly(42))); 47 48 // These are the opposite of other tests. 49 ForwardingTestObject a; 50 ForwardingTestObject b; 51 assert(fn(a, b)); 52 assert(!fn(std::move(a), std::move(b))); 53 54 assert(fn(1, 2)); 55 assert(!fn(2, 2)); 56 assert(fn(2, 1)); 57 58 assert(fn(2, 1L)); 59 60 // Make sure that "ranges::equal_to(x, y) == !ranges::not_equal_to(x, y)", even here. 61 assert(!fn(PtrAndNotEqOperator(), PtrAndNotEqOperator())); 62 assert(std::ranges::equal_to()(PtrAndNotEqOperator(), PtrAndNotEqOperator())); 63 64 return true; 65 } 66 67 int main(int, char**) { 68 69 test(); 70 static_assert(test()); 71 72 // test total ordering of int* for not_equal_to<int*> and not_equal_to<void>. 73 do_pointer_comparison_test(std::ranges::not_equal_to()); 74 75 return 0; 76 } 77