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
21template <class T>
22void
23test(const std::complex<T>& c, std::complex<T> x)
24{
25 assert(tan(c) == x);
26}
27
28template <class T>
29void
30test()
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
36void 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(z: t1);
44 std::complex<double> z(imag(z: t2), -real(z: t2));
45 if (std::isnan(x: real(z: 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(x: imag(z: 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
62int main(int, char**)
63{
64 test<float>();
65 test<double>();
66 test<long double>();
67 test_edges();
68
69 return 0;
70}
71

source code of libcxx/test/std/numerics/complex.number/complex.transcendentals/tan.pass.cpp