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
11// <functional>
12
13// ranges::less_equal
14
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 NotTotallyOrdered {
26 friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&);
27};
28
29static_assert(!std::is_invocable_v<std::ranges::less_equal, NotTotallyOrdered, NotTotallyOrdered>);
30static_assert(!std::is_invocable_v<std::ranges::less_equal, int, MoveOnly>);
31static_assert(std::is_invocable_v<std::ranges::less_equal, explicit_operators, explicit_operators>);
32
33static_assert(requires { typename std::ranges::less_equal::is_transparent; });
34
35constexpr bool test() {
36 auto fn = std::ranges::less_equal();
37
38 assert(fn(MoveOnly(41), MoveOnly(42)));
39
40 // These are the opposite of other tests.
41 ForwardingTestObject a;
42 ForwardingTestObject b;
43 assert(fn(a, b));
44 assert(!fn(std::move(a), std::move(b)));
45
46 assert(fn(1, 2));
47 assert(fn(2, 2));
48 assert(!fn(2, 1));
49
50 assert(!fn(2, 1L));
51
52 return true;
53}
54
55int main(int, char**) {
56
57 test();
58 static_assert(test());
59
60 // test total ordering of int* for less_equal<int*> and less_equal<void>.
61 do_pointer_comparison_test(std::ranges::less_equal());
62
63 return 0;
64}
65

source code of libcxx/test/std/utilities/function.objects/range.cmp/less_equal.pass.cpp