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83ffe9cd | 1 | // Copyright (C) 2019-2023 Free Software Foundation, Inc. |
24387442 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
bb2dd761 | 18 | // { dg-do run { target c++20 } } |
f4ab6846 | 19 | // { dg-add-options no_pch } |
24387442 JW |
20 | |
21 | #include <numeric> | |
22 | ||
23 | #ifndef __cpp_lib_interpolate | |
b1c0e859 | 24 | # error "Feature-test macro for midpoint and lerp missing in <numeric>" |
24387442 | 25 | #elif __cpp_lib_interpolate != 201902L |
b1c0e859 | 26 | # error "Feature-test macro for midpoint and lerp has wrong value in <numeric>" |
24387442 JW |
27 | #endif |
28 | ||
29 | #include <climits> | |
30 | #include <testsuite_hooks.h> | |
31 | ||
32 | static_assert(std::is_same_v<decltype(std::midpoint(0, 1)), int>); | |
33 | static_assert(noexcept(std::midpoint(1, 2))); | |
34 | ||
35 | struct test_type { }; | |
36 | template<typename T> decltype(std::midpoint<T>(T(), T())) try_midpoint(int); | |
37 | template<typename T> test_type try_midpoint(...); | |
38 | template<typename T> constexpr bool no_midpoint() | |
39 | { return std::is_same_v<decltype(try_midpoint<T>()), test_type>; } | |
40 | ||
41 | static_assert(no_midpoint<bool>()); | |
42 | static_assert(no_midpoint<const bool>()); | |
43 | static_assert(no_midpoint<const int>()); | |
44 | static_assert(no_midpoint<volatile int>()); | |
45 | ||
46 | static_assert( std::midpoint(0, 0) == 0 ); | |
47 | static_assert( std::midpoint(1, 1) == 1 ); | |
48 | static_assert( std::midpoint(0, 1) == 0 ); | |
49 | static_assert( std::midpoint(1, 0) == 1 ); | |
50 | static_assert( std::midpoint(0, 2) == 1 ); | |
51 | static_assert( std::midpoint(3, 2) == 3 ); | |
52 | static_assert( std::midpoint(-5, 4) == -1 ); | |
53 | static_assert( std::midpoint(5, -4) == 1 ); | |
54 | static_assert( std::midpoint(-5, -4) == -5 ); | |
55 | static_assert( std::midpoint(-4, -5) == -4 ); | |
56 | static_assert( std::midpoint(INT_MIN, INT_MAX) == -1 ); | |
57 | static_assert( std::midpoint(INT_MAX, INT_MIN) == 0 ); | |
58 | static_assert( std::midpoint(INT_MAX, INT_MAX) == INT_MAX ); | |
59 | static_assert( std::midpoint(INT_MAX, INT_MAX-1) == INT_MAX ); | |
60 | static_assert( std::midpoint(INT_MAX-1, INT_MAX-1) == INT_MAX-1 ); | |
61 | static_assert( std::midpoint(INT_MAX-1, INT_MAX) == INT_MAX-1 ); | |
62 | static_assert( std::midpoint(INT_MAX, INT_MAX-2) == INT_MAX-1 ); | |
63 | ||
64 | static_assert( std::midpoint(0u, 0u) == 0 ); | |
65 | static_assert( std::midpoint(0u, 1u) == 0 ); | |
66 | static_assert( std::midpoint(1u, 0u) == 1 ); | |
67 | static_assert( std::midpoint(0u, 2u) == 1 ); | |
68 | static_assert( std::midpoint(3u, 2u) == 3 ); | |
69 | static_assert( std::midpoint(0u, UINT_MAX) == UINT_MAX/2 ); | |
70 | static_assert( std::midpoint(UINT_MAX, 0u) == (UINT_MAX/2 + 1) ); | |
71 | static_assert( std::midpoint(UINT_MAX, UINT_MAX) == UINT_MAX ); | |
72 | static_assert( std::midpoint(UINT_MAX, UINT_MAX-1) == UINT_MAX ); | |
73 | static_assert( std::midpoint(UINT_MAX-1, UINT_MAX-1) == UINT_MAX-1 ); | |
74 | static_assert( std::midpoint(UINT_MAX-1, UINT_MAX) == UINT_MAX-1 ); | |
75 | static_assert( std::midpoint(UINT_MAX, UINT_MAX-2) == UINT_MAX-1 ); | |
76 | ||
77 | static_assert( std::midpoint<short>(0, 0) == 0 ); | |
78 | static_assert( std::midpoint<short>(0, 1) == 0 ); | |
79 | static_assert( std::midpoint<short>(1, 0) == 1 ); | |
80 | static_assert( std::midpoint<short>(0, 2) == 1 ); | |
81 | static_assert( std::midpoint<short>(3, 2) == 3 ); | |
82 | static_assert( std::midpoint<short>(-5, 4) == -1 ); | |
83 | static_assert( std::midpoint<short>(5, -4) == 1 ); | |
84 | static_assert( std::midpoint<short>(-5, -4) == -5 ); | |
85 | static_assert( std::midpoint<short>(-4, -5) == -4 ); | |
86 | static_assert( std::midpoint<short>(SHRT_MIN, SHRT_MAX) == -1 ); | |
87 | static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MIN) == 0 ); | |
88 | static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX) == SHRT_MAX ); | |
89 | static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX-1) == SHRT_MAX ); | |
90 | static_assert( std::midpoint<short>(SHRT_MAX-1, SHRT_MAX-1) == SHRT_MAX-1 ); | |
91 | static_assert( std::midpoint<short>(SHRT_MAX-1, SHRT_MAX) == SHRT_MAX-1 ); | |
92 | static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX-2) == SHRT_MAX-1 ); | |
93 | ||
94 | static_assert( std::midpoint<signed char>(0, 0) == 0 ); | |
95 | static_assert( std::midpoint<signed char>(1, 1) == 1 ); | |
96 | static_assert( std::midpoint<signed char>(0, 1) == 0 ); | |
97 | static_assert( std::midpoint<signed char>(1, 0) == 1 ); | |
98 | static_assert( std::midpoint<signed char>(0, 2) == 1 ); | |
99 | static_assert( std::midpoint<signed char>(3, 2) == 3 ); | |
100 | static_assert( std::midpoint<signed char>(-5, 4) == -1 ); | |
101 | static_assert( std::midpoint<signed char>(5, -4) == 1 ); | |
102 | static_assert( std::midpoint<signed char>(-5, -4) == -5 ); | |
103 | static_assert( std::midpoint<signed char>(-4, -5) == -4 ); | |
104 | static_assert( std::midpoint<signed char>(SCHAR_MIN, SCHAR_MAX) == -1 ); | |
105 | static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MIN) == 0 ); | |
106 | static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MAX) == SCHAR_MAX ); | |
107 | static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MAX-1) == SCHAR_MAX); | |
108 | ||
109 | void | |
110 | test01() | |
111 | { | |
112 | // Test every possibility for signed char. | |
113 | for (int a = SCHAR_MIN; a <= SCHAR_MAX; ++a) | |
114 | for (int b = SCHAR_MIN; b <= SCHAR_MAX; ++b) | |
115 | VERIFY( std::midpoint(a, b) == std::midpoint<int>(a, b) ); | |
116 | } | |
117 | ||
118 | int main() | |
119 | { | |
120 | test01(); | |
121 | } |