libcxx/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp

   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 //   exp(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(exp(c) == x);
  26 }
  27
  28 template <class T>
  29 void
  30 test()
  31 {
  32     test(std::complex<T>(0, 0), std::complex<T>(1, 0));
  33 }
  34
  35 void 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 = exp(testcases[i]);
  41         if (testcases[i].real() == 0 && testcases[i].imag() == 0)
  42         {
  43             assert(r.real() == 1.0);
  44             assert(r.imag() == 0);
  45             assert(std::signbit(testcases[i].imag()) == std::signbit(r.imag()));
  46         }
  47         else if (std::isfinite(testcases[i].real()) && std::isinf(testcases[i].imag()))
  48         {
  49             assert(std::isnan(r.real()));
  50             assert(std::isnan(r.imag()));
  51         }
  52         else if (std::isfinite(testcases[i].real()) && std::isnan(testcases[i].imag()))
  53         {
  54             assert(std::isnan(r.real()));
  55             assert(std::isnan(r.imag()));
  56         }
  57         else if (std::isinf(testcases[i].real()) && testcases[i].real() > 0 && testcases[i].imag() == 0)
  58         {
  59             assert(std::isinf(r.real()));
  60             assert(r.real() > 0);
  61             assert(r.imag() == 0);
  62             assert(std::signbit(testcases[i].imag()) == std::signbit(r.imag()));
  63         }
  64         else if (std::isinf(testcases[i].real()) && testcases[i].real() < 0 && std::isinf(testcases[i].imag()))
  65         {
  66             assert(r.real() == 0);
  67             assert(r.imag() == 0);
  68         }
  69         else if (std::isinf(testcases[i].real()) && testcases[i].real() > 0 && std::isinf(testcases[i].imag()))
  70         {
  71             assert(std::isinf(r.real()));
  72             assert(std::isnan(r.imag()));
  73         }
  74         else if (std::isinf(testcases[i].real()) && testcases[i].real() < 0 && std::isnan(testcases[i].imag()))
  75         {
  76             assert(r.real() == 0);
  77             assert(r.imag() == 0);
  78         }
  79         else if (std::isinf(testcases[i].real()) && testcases[i].real() > 0 && std::isnan(testcases[i].imag()))
  80         {
  81             assert(std::isinf(r.real()));
  82             assert(std::isnan(r.imag()));
  83         }
  84         else if (std::isnan(testcases[i].real()) && testcases[i].imag() == 0)
  85         {
  86             assert(std::isnan(r.real()));
  87             assert(r.imag() == 0);
  88             assert(std::signbit(testcases[i].imag()) == std::signbit(r.imag()));
  89         }
  90         else if (std::isnan(testcases[i].real()) && testcases[i].imag() != 0)
  91         {
  92             assert(std::isnan(r.real()));
  93             assert(std::isnan(r.imag()));
  94         }
  95         else if (std::isnan(testcases[i].real()) && std::isnan(testcases[i].imag()))
  96         {
  97             assert(std::isnan(r.real()));
  98             assert(std::isnan(r.imag()));
  99         }
 100         else if (std::isfinite(testcases[i].imag()) && std::abs(testcases[i].imag()) <= 1)
 101         {
 102             assert(!std::signbit(r.real()));
 103             assert(std::signbit(r.imag()) == std::signbit(testcases[i].imag()));
 104         }
 105         else if (std::isinf(r.real()) && testcases[i].imag() == 0) {
 106             assert(r.imag() == 0);
 107             assert(std::signbit(testcases[i].imag()) == std::signbit(r.imag()));
 108         }
 109     }
 110 }
 111
 112 int main(int, char**)
 113 {
 114     test<float>();
 115     test<double>();
 116     test<long double>();
 117     test_edges();
 118
 119     return 0;
 120 }