libcxx/test/std/numerics/complex.number/complex.member.ops/minus_equal_scalar.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 T& 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     assert(c.real() == 0);
  25     assert(c.imag() == 0);
  26     c -= 1.5;
  27     assert(c.real() == -1.5);
  28     assert(c.imag() == 0);
  29     c -= 1.5;
  30     assert(c.real() == -3);
  31     assert(c.imag() == 0);
  32     c -= -1.5;
  33     assert(c.real() == -1.5);
  34     assert(c.imag() == 0);
  35     return true;
  36 }
  37
  38 int main(int, char**)
  39 {
  40     test<float>();
  41     test<double>();
  42     test<long double>();
  43
  44 #if TEST_STD_VER >= 20
  45     static_assert(test<float>());
  46     static_assert(test<double>());
  47     static_assert(test<long double>());
  48 #endif
  49
  50   return 0;
  51 }