libcxx/test/std/numerics/complex.number/complex.value.ops/abs.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 //   T
  13 //   abs(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()
  24 {
  25     std::complex<T> z(3, 4);
  26     assert(abs(z) == 5);
  27 }
  28
  29 void test_edges()
  30 {
  31     const unsigned N = sizeof(testcases) / sizeof(testcases[0]);
  32     for (unsigned i = 0; i < N; ++i)
  33     {
  34         double r = abs(testcases[i]);
  35         switch (classify(testcases[i]))
  36         {
  37         case zero:
  38             assert(r == 0);
  39             assert(!std::signbit(r));
  40             break;
  41         case non_zero:
  42             assert(std::isfinite(r) && r > 0);
  43             break;
  44         case inf:
  45             assert(std::isinf(r) && r > 0);
  46             break;
  47         case NaN:
  48             assert(std::isnan(r));
  49             break;
  50         case non_zero_nan:
  51             assert(std::isnan(r));
  52             break;
  53         }
  54     }
  55 }
  56
  57 int main(int, char**)
  58 {
  59     test<float>();
  60     test<double>();
  61     test<long double>();
  62     test_edges();
  63
  64   return 0;
  65 }