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// proj(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>& z, std::complex<T> x)
24{
25 assert(proj(z) == x);
26}
27
28template <class T>
29void
30test()
31{
32 test(std::complex<T>(1, 2), std::complex<T>(1, 2));
33 test(std::complex<T>(-1, 2), std::complex<T>(-1, 2));
34 test(std::complex<T>(1, -2), std::complex<T>(1, -2));
35 test(std::complex<T>(-1, -2), std::complex<T>(-1, -2));
36}
37
38void test_edges()
39{
40 const unsigned N = sizeof(testcases) / sizeof(testcases[0]);
41 for (unsigned i = 0; i < N; ++i)
42 {
43 std::complex<double> r = proj(testcases[i]);
44 switch (classify(testcases[i]))
45 {
46 case zero:
47 case non_zero:
48 assert(r == testcases[i]);
49 assert(std::signbit(real(r)) == std::signbit(real(testcases[i])));
50 assert(std::signbit(imag(r)) == std::signbit(imag(testcases[i])));
51 break;
52 case inf:
53 assert(std::isinf(real(r)) && real(r) > 0);
54 assert(imag(r) == 0);
55 assert(std::signbit(imag(r)) == std::signbit(imag(testcases[i])));
56 break;
57 case NaN:
58 case non_zero_nan:
59 assert(classify(r) == classify(testcases[i]));
60 break;
61 }
62 }
63}
64
65int main(int, char**)
66{
67 test<float>();
68 test<double>();
69 test<long double>();
70 test_edges();
71
72 return 0;
73}
74

source code of libcxx/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp