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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// <functional>
// ranges::not_equal_to
#include <functional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "compare_types.h"
#include "MoveOnly.h"
#include "pointer_comparison_test_helper.h"
struct NotEqualityComparable {
friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&);
friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete;
};
static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>);
static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>);
static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>);
static_assert(requires { typename std::ranges::not_equal_to::is_transparent; });
struct PtrAndNotEqOperator {
constexpr operator void*() const { return nullptr; }
// We *don't* want operator!= to be picked here.
friend constexpr bool operator!=(PtrAndNotEqOperator, PtrAndNotEqOperator) { return true; }
};
constexpr bool test() {
auto fn = std::ranges::not_equal_to();
assert(fn(MoveOnly(41), MoveOnly(42)));
// These are the opposite of other tests.
ForwardingTestObject a;
ForwardingTestObject b;
assert(fn(a, b));
assert(!fn(std::move(a), std::move(b)));
assert(fn(1, 2));
assert(!fn(2, 2));
assert(fn(2, 1));
assert(fn(2, 1L));
// Make sure that "ranges::equal_to(x, y) == !ranges::not_equal_to(x, y)", even here.
assert(!fn(PtrAndNotEqOperator(), PtrAndNotEqOperator()));
assert(std::ranges::equal_to()(PtrAndNotEqOperator(), PtrAndNotEqOperator()));
return true;
}
int main(int, char**) {
test();
static_assert(test());
// test total ordering of int* for not_equal_to<int*> and not_equal_to<void>.
do_pointer_comparison_test(std::ranges::not_equal_to());
return 0;
}