Looks like bug: extern "C" is applied to class member-functions.
This code compiled without error with previous DMC (8.41.5n) and was taken from MS DX8 SDK (dxtrans.h)

If this is proper behavior (according to standards), I would like to hear suggestions how to work around this.

Nic Tiger


dmc -c dx.cpp >1
------------------
      DXBASESAMPLE(const DWORD val) { *this = (*(DXBASESAMPLE *)&val); }
                 ^
dx.cpp(19) : Error: '?0' is already defined
      operator DWORD () const {return *((DWORD *)this); }
             ^
dx.cpp(20) : Error: '?0' is already defined
--- errorlevel 1

------------------
extern "C"{
  typedef unsigned long DWORD;
  typedef unsigned char BYTE;

  class DXBASESAMPLE
  {
  public:
      BYTE Blue;
      BYTE Green;
      BYTE Red;
      BYTE Alpha;
      DXBASESAMPLE() {}
      DXBASESAMPLE(const BYTE alpha, const BYTE red, const BYTE green, const BYTE blue) :
          Alpha(alpha),
          Red(red),
          Green(green),
          Blue(blue) {}
      DXBASESAMPLE(const DWORD val) { *this = (*(DXBASESAMPLE *)&val); }
      operator DWORD () const {return *((DWORD *)this); }
      DWORD operator=(const DWORD val) { return *this = *((DXBASESAMPLE *)&val); }
  }; // DXBASESAMPLE
}

Nic Tiger wrote:
> Looks like bug: extern "C" is applied to class member-functions.
> This code compiled without error with previous DMC (8.41.5n) and was taken from MS DX8 SDK (dxtrans.h)

The extern statements apply to everything inside them, including the class members. To not have them apply, move the class declaration outside the extern statement.

Walter Bright wrote:
> Nic Tiger wrote:
>> Looks like bug: extern "C" is applied to class member-functions.
>> This code compiled without error with previous DMC (8.41.5n) and was taken from MS DX8 SDK (dxtrans.h)
> 
> The extern statements apply to everything inside them, including the class members. To not have them apply, move the class declaration outside the extern statement.

too bad...
because it is not my code, but Microsoft's :(

will have to insert two lines, and maybe put all these headers under version control system to track changes.

thanks for early reply!