Thread: Question of the day

What the advantage of forward declaration?

For example:
In header_file.h

typedef struct foo * fooPtr;

In implement_file.c

Code:

  struct foo
    {
       int x;
       int y;
    }

[code tags added by ygfperson]

it helps with type checking most of the time. it's unlikely you'll make the same mistake twice in one program.