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 // constexpr bool cmp_greater(T t, U u) noexcept; // C++20
14
15 #include <utility>
16 #include <limits>
17 #include <numeric>
18 #include <tuple>
19 #include <cassert>
20
21 #include "test_macros.h"
22
23 template <typename T>
24 struct Tuple {
25 T min;
26 T max;
27 T mid;
TupleTuple28 constexpr Tuple() {
29 min = std::numeric_limits<T>::min();
30 max = std::numeric_limits<T>::max();
31 mid = std::midpoint(min, max);
32 }
33 };
34
35 template <typename T>
test_cmp_greater1()36 constexpr void test_cmp_greater1() {
37 constexpr Tuple<T> tup;
38 assert(!std::cmp_greater(T(0), T(1)));
39 assert(!std::cmp_greater(T(1), T(2)));
40 assert(!std::cmp_greater(tup.min, tup.max));
41 assert(!std::cmp_greater(tup.min, tup.mid));
42 assert(!std::cmp_greater(tup.mid, tup.max));
43 assert(std::cmp_greater(T(1), T(0)));
44 assert(std::cmp_greater(T(10), T(5)));
45 assert(std::cmp_greater(tup.max, tup.min));
46 assert(std::cmp_greater(tup.mid, tup.min));
47 assert(!std::cmp_greater(tup.mid, tup.mid));
48 assert(!std::cmp_greater(tup.min, tup.min));
49 assert(!std::cmp_greater(tup.max, tup.max));
50 assert(std::cmp_greater(tup.max, 1));
51 assert(std::cmp_greater(1, tup.min));
52 assert(!std::cmp_greater(T(-1), T(-1)));
53 assert(std::cmp_greater(-2, tup.min) == std::is_signed_v<T>);
54 assert(!std::cmp_greater(tup.min, -2) == std::is_signed_v<T>);
55 assert(!std::cmp_greater(-2, tup.max));
56 assert(std::cmp_greater(tup.max, -2));
57 }
58
59 template <typename T, typename U>
test_cmp_greater2()60 constexpr void test_cmp_greater2() {
61 assert(!std::cmp_greater(T(0), U(1)));
62 assert(std::cmp_greater(T(1), U(0)));
63 }
64
65 template <class... Ts>
test1(const std::tuple<Ts...> &)66 constexpr void test1(const std::tuple<Ts...>&) {
67 (test_cmp_greater1<Ts>() , ...);
68 }
69
70 template <class T, class... Us>
test2_impl(const std::tuple<Us...> &)71 constexpr void test2_impl(const std::tuple<Us...>&) {
72 (test_cmp_greater2<T, Us>() , ...);
73 }
74
75 template <class... Ts, class UTuple>
test2(const std::tuple<Ts...> &,const UTuple & utuple)76 constexpr void test2(const std::tuple<Ts...>&, const UTuple& utuple) {
77 (test2_impl<Ts>(utuple) , ...);
78 }
79
test()80 constexpr bool test() {
81 std::tuple<
82 #ifndef TEST_HAS_NO_INT128
83 __int128_t, __uint128_t,
84 #endif
85 unsigned long long, long long, unsigned long, long, unsigned int, int,
86 unsigned short, short, unsigned char, signed char> types;
87 test1(types);
88 test2(types, types);
89 return true;
90 }
91
main(int,char **)92 int main(int, char**) {
93 ASSERT_NOEXCEPT(std::cmp_greater(1, 0));
94 test();
95 static_assert(test());
96 return 0;
97 }
98