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 //   tan(const complex<T>& x);
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>& c, std::complex<T> x)
24 {
25     assert(tan(c) == x);
26 }
27 
28 template <class T>
29 void
30 test()
31 {
32     test(std::complex<T>(0, 0), std::complex<T>(0, 0));
33     test(std::complex<T>(10000, -10000), std::complex<T>(0, -1));
34 }
35 
36 void test_edges()
37 {
38     const unsigned N = sizeof(testcases) / sizeof(testcases[0]);
39     for (unsigned i = 0; i < N; ++i)
40     {
41         std::complex<double> r = tan(testcases[i]);
42         std::complex<double> t1(-imag(testcases[i]), real(testcases[i]));
43         std::complex<double> t2 = tanh(t1);
44         std::complex<double> z(imag(t2), -real(t2));
45         if (std::isnan(real(r)))
46             assert(std::isnan(real(z)));
47         else
48         {
49             assert(real(r) == real(z));
50             assert(std::signbit(real(r)) == std::signbit(real(z)));
51         }
52         if (std::isnan(imag(r)))
53             assert(std::isnan(imag(z)));
54         else
55         {
56             assert(imag(r) == imag(z));
57             assert(std::signbit(imag(r)) == std::signbit(imag(z)));
58         }
59     }
60 }
61 
62 int main(int, char**)
63 {
64     test<float>();
65     test<double>();
66     test<long double>();
67     test_edges();
68 
69   return 0;
70 }
71