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 //   tan(const complex<T>& x);
15 
16 #include <complex>
17 #include <cassert>
18 
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     typedef std::complex<double> C;
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         std::complex<double> r = tan(x[i]);
44         std::complex<double> t1(-imag(x[i]), real(x[i]));
45         std::complex<double> t2 = tanh(t1);
46         std::complex<double> z(imag(t2), -real(t2));
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 int main()
65 {
66     test<float>();
67     test<double>();
68     test<long double>();
69     test_edges();
70 }
71