libcxx/test/std/numerics/complex.number/complex.member.ops/minus_equal_complex.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 // complex& operator-=(const complex& rhs); // constexpr in C++20
  12
  13 #include <complex>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17
  18 template <class T>
  19 TEST_CONSTEXPR_CXX20
  20 bool
  21 test()
  22 {
  23     std::complex<T> c;
  24     const std::complex<T> c2(1.5, 2.5);
  25     assert(c.real() == 0);
  26     assert(c.imag() == 0);
  27     c -= c2;
  28     assert(c.real() == -1.5);
  29     assert(c.imag() == -2.5);
  30     c -= c2;
  31     assert(c.real() == -3);
  32     assert(c.imag() == -5);
  33
  34     std::complex<T> c3;
  35
  36     c3 = c;
  37     std::complex<int> ic (1,1);
  38     c3 -= ic;
  39     assert(c3.real() == -4);
  40     assert(c3.imag() == -6);
  41
  42     c3 = c;
  43     std::complex<float> fc (1,1);
  44     c3 -= fc;
  45     assert(c3.real() == -4);
  46     assert(c3.imag() == -6);
  47     return true;
  48 }
  49
  50 int main(int, char**)
  51 {
  52     test<float>();
  53     test<double>();
  54     test<long double>();
  55
  56 #if TEST_STD_VER >= 20
  57     static_assert(test<float>());
  58     static_assert(test<double>());
  59     static_assert(test<long double>());
  60 #endif
  61
  62     return 0;
  63 }