need 'this' to access data member

[Chris Nicholson-Sauls]

clayasaurus wrote:
> Hi, I have the following code attached, and I do not understand why I 
> can not access this data member. Help is very much appreciated, thanks.
> 
> ~ Clay
> 
> 
> ------------------------------------------------------------------------
> 
> // datafield hacks
> alias int FILE; 
> alias int Uint8; 
> 
> // structure
> struct SDL_RWops
> {
> 
>     int (*seek)(SDL_RWops *context, int offset, int whence);
>     int (*read)(SDL_RWops *context, void *ptr, int size, int maxnum);
>     int (*write)(SDL_RWops *context, void *ptr, int size, int num);
>     int (*close)(SDL_RWops *context);
>     uint type;
> 	
>     union hide
>     {
>         version(Windows)
>         {
>             struct win32io
>             {
>                 int append;
>                 void *h;
>             }
>         }
>         struct stdio
>         {
>             int autoclose;
>             FILE *fp;
>         }
>         struct mem
>         {
>             Uint8 *base;
>             Uint8 *here;
>             Uint8 *stop;
>         }
>         struct unknown
>         {
>             void *data1;
>         }
>     }
> 	hide hidden; 
> 	
> }
> 
> 
> int main()
> {
>     SDL_RWops w; 
> 
>     // need 'this' to access data member data1??
>     w.hidden.unknown.data1 = null; 
> 
>     return 0; 
> }

Because 'SDL_RWops.hidden.unknown' is a struct type decleration, not a field decleration. 
  In the same way that you had to create a field of type 'hide' in order to access its 
components ('hidden') you also need a field of type 'unknown' to do so.

-- Chris Nicholson-Sauls