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 // <complex>
10 
11 // template<class T>
12 //   complex<T>
13 //   pow(const complex<T>& x, const complex<T>& y);
14 
15 #include <complex>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "../cases.h"
20 
21 template <class T>
22 void
23 test(const std::complex<T>& a, const std::complex<T>& b, std::complex<T> x)
24 {
25     std::complex<T> c = pow(a, b);
26     is_about(real(c), real(x));
27     is_about(imag(c), imag(x));
28 }
29 
30 template <class T>
31 void
32 test()
33 {
34     test(std::complex<T>(2, 3), std::complex<T>(2, 0), std::complex<T>(-5, 12));
35 }
36 
37 void test_edges()
38 {
39     const unsigned N = sizeof(testcases) / sizeof(testcases[0]);
40     for (unsigned i = 0; i < N; ++i)
41     {
42         for (unsigned j = 0; j < N; ++j)
43         {
44             std::complex<double> r = pow(testcases[i], testcases[j]);
45             std::complex<double> z = exp(testcases[j] * log(testcases[i]));
46             if (std::isnan(real(r)))
47                 assert(std::isnan(real(z)));
48             else
49             {
50                 assert(real(r) == real(z));
51                 assert(std::signbit(real(r)) == std::signbit(real(z)));
52             }
53             if (std::isnan(imag(r)))
54                 assert(std::isnan(imag(z)));
55             else
56             {
57                 assert(imag(r) == imag(z));
58                 assert(std::signbit(imag(r)) == std::signbit(imag(z)));
59             }
60         }
61     }
62 }
63 
64 int main(int, char**)
65 {
66     test<float>();
67     test<double>();
68     test<long double>();
69     test_edges();
70 
71   return 0;
72 }
73