Re: OS header files; const in prototypes, especially in typedef'dpointers

[Dave Glowacki]

"Chris Antos" wrote:
> i don't think you can do that without also at least declaring struct
> ListType, such as:
> 
>     struct ListType;
>     typedef struct ListType *ListPtr;
> 
> but yes, that's exactly what i was trying to point out.

Nope, it's perfectly legal.  The following code compiled and ran for
all the compilers I've got access to (GCC + the system compilers for
HP-UX, IRIX, AIX and Solaris):


        typedef struct foo FooType;
        typedef FooType *FooPtr;

        int
        main(void)
        {
          FooPtr a;

          a = 0;
          return 0;
        }

It'd work just as well if you skipped the intermediate 'FooType' step
and just did:

        typedef struct foo *FooPtr;

Of course, there's no way to declare something as 'FooType', but
that's the point, isn't it?