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7adcbafe | 1 | // Copyright (C) 2019-2022 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 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do run { target c++2a } } | |
20 | ||
21 | #include <cmath> | |
22 | ||
23 | #ifndef __cpp_lib_interpolate | |
b1c0e859 | 24 | # error "Feature-test macro for midpoint and lerp missing in <cmath>" |
24387442 | 25 | #elif __cpp_lib_interpolate != 201902L |
b1c0e859 | 26 | # error "Feature-test macro for midpoint and lerp has wrong value in <cmath>" |
24387442 JW |
27 | #endif |
28 | ||
29 | #include <limits> | |
30 | #include <testsuite_hooks.h> | |
31 | ||
32 | void | |
33 | test01() | |
34 | { | |
35 | using lim = std::numeric_limits<double>; | |
36 | ||
37 | VERIFY( std::lerp(0.0, 1.0, 0.0) == 0.0 ); | |
38 | VERIFY( std::lerp(-2.0, 10.0, 1.0) == 10.0 ); | |
39 | VERIFY( std::lerp(2.0, -10.0, 1.0) == -10.0 ); | |
40 | VERIFY( std::lerp(-8.0, 10.0, 0.5) == 1.0 ); | |
41 | VERIFY( std::lerp(-10.0, 10.0, 0.25) == -5.0 ); | |
42 | VERIFY( std::lerp(10.0, -10.0, 0.375) == 2.5 ); | |
43 | ||
44 | VERIFY( std::lerp(2.0, 2.0, 200.0) == 2.0 ); | |
45 | VERIFY( std::lerp(2.0, 4.0, 200.0) == 402.0 ); | |
46 | VERIFY( std::lerp(2.0, 4.0, -20.0) == -38.0 ); | |
47 | ||
48 | VERIFY( std::lerp(1.1, 30201.1, 0) == 1.1 ); | |
49 | VERIFY( std::lerp(1.1, 30201.1, 1) == 30201.1 ); | |
50 | VERIFY( std::lerp(1.1, -30201.1, 0) == 1.1 ); | |
51 | VERIFY( std::lerp(1.1, -30201.1, 1) == -30201.1 ); | |
52 | ||
53 | VERIFY( std::lerp(1.1, 1.1, lim::infinity()) == 1.1 ); | |
54 | VERIFY( std::isfinite(std::lerp(1.1, 1.1+lim::min(), lim::max())) ); | |
55 | ||
56 | VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() ); | |
57 | VERIFY( std::lerp(lim::max(), lim::max()/9e9, 0) == lim::max() ); | |
58 | VERIFY( std::lerp(lim::max()/9e9, lim::max(), 1) == lim::max() ); | |
59 | } | |
60 | ||
61 | void | |
62 | test02() | |
63 | { | |
64 | using lim = std::numeric_limits<float>; | |
65 | ||
66 | VERIFY( std::lerp(0.0f, 1.0f, 0.0f) == 0.0f ); | |
67 | VERIFY( std::lerp(-2.0f, 10.0f, 1.0f) == 10.0f ); | |
68 | VERIFY( std::lerp(2.0f, -10.0f, 1.0f) == -10.0f ); | |
69 | VERIFY( std::lerp(-8.0f, 10.0f, 0.5f) == 1.0f ); | |
70 | VERIFY( std::lerp(-10.0f, 10.0f, 0.25f) == -5.0f ); | |
71 | VERIFY( std::lerp(10.0f, -10.0f, 0.375f) == 2.5f ); | |
72 | ||
73 | VERIFY( std::lerp(2.0f, 2.0f, 200.0f) == 2.0f ); | |
74 | VERIFY( std::lerp(2.0f, 4.0f, 200.0f) == 402.0f ); | |
75 | VERIFY( std::lerp(2.0f, 4.0f, -20.0f) == -38.0f ); | |
76 | ||
77 | VERIFY( std::lerp(1.1f, 30201.1f, 0) == 1.1f ); | |
78 | VERIFY( std::lerp(1.1f, 30201.1f, 1) == 30201.1f ); | |
79 | VERIFY( std::lerp(1.1f, -30201.1f, 0) == 1.1f ); | |
80 | VERIFY( std::lerp(1.1f, -30201.1f, 1) == -30201.1f ); | |
81 | ||
82 | VERIFY( std::lerp(1.1f, 1.1f, lim::infinity()) == 1.1f ); | |
83 | VERIFY( std::isfinite(std::lerp(1.1f, 1.1f+lim::min(), lim::max())) ); | |
84 | ||
85 | VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() ); | |
86 | VERIFY( std::lerp(lim::max(), lim::max()/9e9f, 0) == lim::max() ); | |
87 | VERIFY( std::lerp(lim::max()/9e9f, lim::max(), 1) == lim::max() ); | |
88 | } | |
89 | ||
90 | void | |
91 | test03() | |
92 | { | |
93 | using lim = std::numeric_limits<long double>; | |
94 | ||
95 | VERIFY( std::lerp(0.0l, 1.0l, 0.0l) == 0.0l ); | |
96 | VERIFY( std::lerp(-2.0l, 10.0l, 1.0l) == 10.0l ); | |
97 | VERIFY( std::lerp(2.0l, -10.0l, 1.0l) == -10.0l ); | |
98 | VERIFY( std::lerp(-8.0l, 10.0l, 0.5l) == 1.0l ); | |
99 | VERIFY( std::lerp(-10.0l, 10.0l, 0.25l) == -5.0l ); | |
100 | VERIFY( std::lerp(10.0l, -10.0l, 0.375l) == 2.5l ); | |
101 | ||
102 | VERIFY( std::lerp(2.0l, 2.0l, 200.0l) == 2.0l ); | |
103 | VERIFY( std::lerp(2.0l, 4.0l, 200.0l) == 402.0l ); | |
104 | VERIFY( std::lerp(2.0l, 4.0l, -20.0l) == -38.0l ); | |
105 | ||
106 | VERIFY( std::lerp(1.1l, 30201.1l, 0) == 1.1l ); | |
107 | VERIFY( std::lerp(1.1l, 30201.1l, 1) == 30201.1l ); | |
108 | VERIFY( std::lerp(1.1l, -30201.1l, 0) == 1.1l ); | |
109 | VERIFY( std::lerp(1.1l, -30201.1l, 1) == -30201.1l ); | |
110 | ||
111 | VERIFY( std::lerp(1.1l, 1.1l, lim::infinity()) == 1.1l ); | |
112 | VERIFY( std::isfinite(std::lerp(1.1l, 1.1l+lim::min(), lim::max())) ); | |
113 | ||
114 | VERIFY( std::lerp(lim::max(), lim::max(), 1) == lim::max() ); | |
115 | VERIFY( std::lerp(lim::max(), lim::max()/9e9l, 0) == lim::max() ); | |
116 | VERIFY( std::lerp(lim::max()/9e9l, lim::max(), 1) == lim::max() ); | |
117 | } | |
118 | ||
119 | int main() | |
120 | { | |
121 | test01(); | |
122 | test02(); | |
123 | test03(); | |
124 | } |