Richard W.M. Jones wrote: > On Thu, Apr 18, 2013 at 01:14:33AM +0200, Björn Persson wrote: > [...] > > > Passing pointers to objects from one language to another is likely > > > *not* possible however. > > > > Ada imports and exports C pointers just fine, including pointers to > > functions and records. > > I should have been clearer. I meant passing pointers between non-C > languages is likely not possible. If you mean some kind of fat pointer, that the compiler implements as more than just a memory address, then the one compiler would have to know how the other compiler implements those pointers, and the source code would need to contain an instruction to the compiler to use the other compiler's convention. If both compilers are GCC this should be possible. With compilers from different vendors the coordination could be more of a problem. It seems to me that it's not a matter of pointers so much as the datatypes that the pointers point to. If a type can be represented in both languages, then both objects of that type and pointers to objects can be passed around and used in both languages, as long as at least one of the compilers has appropriate interfacing features. If a type in one language can't be represented in the other language, then objects of that type can't be passed to the other language, and pointers can only be handled as opaque handles to be kept and passed to callbacks. If you mean purely high-level languages that don't even have pointers on the source code level, then yes, handling pointers in those languages could be problematic. Still, any language that can interface with C and deal with C pointers can also share C pointers with any other language that can interface with C. Björn Persson
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