text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // type_traits
  
  // make_signed
  
  #include <type_traits>
  
  enum Enum {zero, one_};
  
  enum BigEnum
  {
      bigzero,
      big = 0xFFFFFFFFFFFFFFFFULL
  };
  
  template <class T, class U>
  void test_make_signed()
  {
      static_assert((std::is_same<typename std::make_signed<T>::type, U>::value), "");
  #if _LIBCPP_STD_VER > 11
      static_assert((std::is_same<std::make_signed_t<T>, U>::value), "");
  #endif
  }
  
  int main()
  {
      test_make_signed< signed char, signed char >();
      test_make_signed< unsigned char, signed char >();
      test_make_signed< char, signed char >();
      test_make_signed< short, signed short >();
      test_make_signed< unsigned short, signed short >();
      test_make_signed< int, signed int >();
      test_make_signed< unsigned int, signed int >();
      test_make_signed< long, signed long >();
      test_make_signed< unsigned long, long >();
      test_make_signed< long long, signed long long >();
      test_make_signed< unsigned long long, signed long long >();
      test_make_signed< wchar_t, std::conditional<sizeof(wchar_t) == 4, int, short>::type >();
      test_make_signed< const wchar_t, std::conditional<sizeof(wchar_t) == 4, const int, const short>::type >();
      test_make_signed< const Enum, const int >();
      test_make_signed< BigEnum, std::conditional<sizeof(long) == 4, long long, long>::type >();
  }
  