libcxx/test/std/numerics/complex.number/cmplx.over/conj.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>      complex<T>           conj(const complex<T>&); // constexpr in C++20
  12 //                        complex<long double> conj(long double);       // constexpr in C++20
  13 //                        complex<double>      conj(double);            // constexpr in C++20
  14 // template<Integral T>   complex<double>      conj(T);                 // constexpr in C++20
  15 //                        complex<float>       conj(float);             // constexpr in C++20
  16
  17 #include <complex>
  18 #include <type_traits>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "../cases.h"
  23
  24 template <class T>
  25 TEST_CONSTEXPR_CXX20
  26 void
  27 test(T x, typename std::enable_if<std::is_integral<T>::value>::type* = 0)
  28 {
  29     static_assert((std::is_same<decltype(std::conj(x)), std::complex<double> >::value), "");
  30     assert(std::conj(x) == conj(std::complex<double>(x, 0)));
  31 }
  32
  33 template <class T>
  34 TEST_CONSTEXPR_CXX20
  35 void
  36 test(T x, typename std::enable_if<std::is_floating_point<T>::value>::type* = 0)
  37 {
  38     static_assert((std::is_same<decltype(std::conj(x)), std::complex<T> >::value), "");
  39     assert(std::conj(x) == conj(std::complex<T>(x, 0)));
  40 }
  41
  42 template <class T>
  43 TEST_CONSTEXPR_CXX20
  44 void
  45 test(T x, typename std::enable_if<!std::is_integral<T>::value &&
  46                                   !std::is_floating_point<T>::value>::type* = 0)
  47 {
  48     static_assert((std::is_same<decltype(std::conj(x)), std::complex<T> >::value), "");
  49     assert(std::conj(x) == conj(std::complex<T>(x, 0)));
  50 }
  51
  52 template <class T>
  53 TEST_CONSTEXPR_CXX20
  54 bool
  55 test()
  56 {
  57     test<T>(0);
  58     test<T>(1);
  59     test<T>(10);
  60     return true;
  61 }
  62
  63 int main(int, char**)
  64 {
  65     test<float>();
  66     test<double>();
  67     test<long double>();
  68     test<int>();
  69     test<unsigned>();
  70     test<long long>();
  71
  72 #if TEST_STD_VER >= 20
  73     static_assert(test<float>());
  74     static_assert(test<double>());
  75     static_assert(test<long double>());
  76     static_assert(test<int>());
  77     static_assert(test<unsigned>());
  78     static_assert(test<long long>());
  79 #endif
  80
  81     return 0;
  82 }