1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <complex>
11
12// template<class T>
13//   complex<T>
14//   pow(const complex<T>& x, const complex<T>& y);
15
16#include <complex>
17#include <cassert>
18
19#include "../cases.h"
20
21template <class T>
22void
23test(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
30template <class T>
31void
32test()
33{
34    test(std::complex<T>(2, 3), std::complex<T>(2, 0), std::complex<T>(-5, 12));
35}
36
37void test_edges()
38{
39    const double pi = std::atan2(+0., -0.);
40    const unsigned N = sizeof(x) / sizeof(x[0]);
41    for (unsigned i = 0; i < N; ++i)
42    {
43        for (unsigned j = 0; j < N; ++j)
44        {
45            std::complex<double> r = pow(x[i], x[j]);
46            std::complex<double> z = exp(x[j] * log(x[i]));
47            if (std::isnan(real(r)))
48                assert(std::isnan(real(z)));
49            else
50            {
51                assert(real(r) == real(z));
52                assert(std::signbit(real(r)) == std::signbit(real(z)));
53            }
54            if (std::isnan(imag(r)))
55                assert(std::isnan(imag(z)));
56            else
57            {
58                assert(imag(r) == imag(z));
59                assert(std::signbit(imag(r)) == std::signbit(imag(z)));
60            }
61        }
62    }
63}
64
65int main()
66{
67    test<float>();
68    test<double>();
69    test<long double>();
70    test_edges();
71}
72