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// <utility>
12
13// template<class T, class U>
14// constexpr bool cmp_less(T t, U u) noexcept; // C++20
15
16#include <utility>
17#include <limits>
18#include <numeric>
19#include <tuple>
20#include <cassert>
21
22#include "test_macros.h"
23
24template <typename T>
25struct Tuple {
26 T min;
27 T max;
28 T mid;
29 constexpr Tuple() {
30 min = std::numeric_limits<T>::min();
31 max = std::numeric_limits<T>::max();
32 mid = std::midpoint(min, max);
33 }
34};
35
36template <typename T>
37constexpr void test_cmp_less1() {
38 constexpr Tuple<T> tup;
39 assert(std::cmp_less(T(0), T(1)));
40 assert(std::cmp_less(T(1), T(2)));
41 assert(std::cmp_less(tup.min, tup.max));
42 assert(std::cmp_less(tup.min, tup.mid));
43 assert(std::cmp_less(tup.mid, tup.max));
44 assert(!std::cmp_less(T(1), T(0)));
45 assert(!std::cmp_less(T(10), T(5)));
46 assert(!std::cmp_less(tup.max, tup.min));
47 assert(!std::cmp_less(tup.mid, tup.min));
48 assert(!std::cmp_less(tup.mid, tup.mid));
49 assert(!std::cmp_less(tup.min, tup.min));
50 assert(!std::cmp_less(tup.max, tup.max));
51 assert(!std::cmp_less(tup.max, 1));
52 assert(!std::cmp_less(1, tup.min));
53 assert(!std::cmp_less(T(-1), T(-1)));
54 assert(!std::cmp_less(-2, tup.min) == std::is_signed_v<T>);
55 assert(std::cmp_less(tup.min, -2) == std::is_signed_v<T>);
56 assert(std::cmp_less(-2, tup.max));
57 assert(!std::cmp_less(tup.max, -2));
58}
59
60template <typename T, typename U>
61constexpr void test_cmp_less2() {
62 assert(std::cmp_less(T(0), U(1)));
63 assert(!std::cmp_less(T(1), U(0)));
64}
65
66template <class... Ts>
67constexpr void test1(const std::tuple<Ts...>&) {
68 (test_cmp_less1<Ts>() , ...);
69}
70
71template <class T, class... Us>
72constexpr void test2_impl(const std::tuple<Us...>&) {
73 (test_cmp_less2<T, Us>() , ...);
74}
75
76template <class... Ts, class UTuple>
77constexpr void test2(const std::tuple<Ts...>&, const UTuple& utuple) {
78 (test2_impl<Ts>(utuple) , ...);
79}
80
81constexpr bool test() {
82 std::tuple<
83#ifndef TEST_HAS_NO_INT128
84 __int128_t, __uint128_t,
85#endif
86 unsigned long long, long long, unsigned long, long, unsigned int, int,
87 unsigned short, short, unsigned char, signed char> types;
88 test1(types);
89 test2(types, utuple: types);
90 return true;
91}
92
93int main(int, char**) {
94 ASSERT_NOEXCEPT(std::cmp_less(0, 1));
95 test();
96 static_assert(test());
97 return 0;
98}
99

source code of libcxx/test/std/utilities/utility/utility.intcmp/intcmp.cmp_less/cmp_less.pass.cpp