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

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