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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
// <functional>
// ranges::less
#include <cassert>
#include <functional>
#include <type_traits>
#include <utility>
#include "test_macros.h"
#include "compare_types.h"
#include "MoveOnly.h"
#include "pointer_comparison_test_helper.h"
struct NotTotallyOrdered {
friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&);
};
static_assert(!std::is_invocable_v<std::ranges::less, NotTotallyOrdered, NotTotallyOrdered>);
static_assert(!std::is_invocable_v<std::ranges::less, int, MoveOnly>);
static_assert(std::is_invocable_v<std::ranges::less, explicit_operators, explicit_operators>);
static_assert(requires { typename std::ranges::less::is_transparent; });
constexpr bool test() {
auto fn = std::ranges::less();
assert(fn(MoveOnly(41), MoveOnly(42)));
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));
return true;
}
int main(int, char**) {
test();
static_assert(test());
// test total ordering of int* for less<int*> and less<void>.
do_pointer_comparison_test(std::ranges::less());
return 0;
}
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