Re: [Chicken-users] FFI: wrapping method that returns object

[Felix Winkelmann]

Sergey Khorev wrote:
> Returning to discussion (complete thread is below for reference)
> Does "is not possible" mean, that creating wrapper for
>
> class A
> {
> public:
>   T makeT();
> };
>
> in the following form:
> T* makeT(A *a)
> {
>   return new T(a.makeT());
> }
> will not work? And such a wrapper should return pointer to
> gc-collected area? If so, how to achive that? Invoke C_alloc() and
> then C_mpointer() to move object to the heap?

Ahem, sorry: I meant using the "T* makeT" wrapper
will work. Your wrapper is the correct way of doing this.
Chicken can currently only pass pointers or numeric values
as arguments to (or results from) C/C++ functions.

If you want to avoid coding, you might write your own little
preprocessor using `foreign-parse/spec' (see the manual):
this macro could (for example) parse the specification, remodel
the interface and generate foreign declarations again.
(This is kind of weird, but actually pretty cool).


cheers,
felix