76 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// <functional>12 13// ranges::not_equal_to14 15#include <cassert>16#include <functional>17#include <type_traits>18#include <utility>19 20#include "test_macros.h"21#include "compare_types.h"22#include "MoveOnly.h"23#include "pointer_comparison_test_helper.h"24 25struct NotEqualityComparable {26 friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&);27 friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete;28};29 30static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>);31static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>);32static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>);33 34static_assert(requires { typename std::ranges::not_equal_to::is_transparent; });35 36struct 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 42constexpr 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 66int 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