Storable empty data declaration

Question

I\'m attempting to create a Haskell wrapper for a C library. The underlying structs are too complicated to express as explicit types, and I don\'t actually use them other than f

Answer 1

You can't allocate something if you don't know how big it is. Is the function just going to ignore its argument? Then pass in a null pointer. Otherwise, you need to actually allocate enough space for the struct - don't cut corners by allocating a zero-byte or pointer-sized buffer, as then the called function will write past the end of your buffer, corrupting memory.

Either finish the data declaration, or write a Storable instance with proper size and alignment values; there's no way around providing size/alignment data in some form.