Re: Structures in 4.0?
- Posted by ghaberek (admin) Oct 02, 2009
- 1293 views
jimcbrown said...
The ability to pass a C struct by value (rather than via a pointer) would be a huge boon to the current C interface. So would being able to take a C struct as a return value (rather than a pointer to said struct).
Yes, that would be nice. Seems like it would have to be integrated into the interpreter somehow. All the structure routines I've used or written reference the memory pointer.
jimcbrown said...
A native struct library should also be able to tell us the sizes of native C types (e.g. sizeof(int), sizeof(char), sizeof(short), sizeof(long)) rather than having us assume that it will always be 4, 1, 2, 4, etc.
Decoding the C_* constants is pretty simple.
function sizeof( atom c_type ) return and_bits( c_type, #FF ) end function function signed( atom c_type ) return right_shift( c_type, #1000000 ) = #01 end function function unsigned( atom c_type ) return right_shift( c_type, #1000000 ) = #02 end function function isfloat( atom c_type ) return right_shift( c_type, #1000000 ) = #03 end function
-Greg
