Re: C array to ada record interface

[tmoran@acm.org]

>>     package B_Ptr_Conversion is new System.Address_To_Access_Conversions(B);
>>     pragma Convention (C, B_Ptr_Conversion.Object_Pointer);
>> is not legal.
> If the Ada compiler uses the same type of addresses as the C
>compiler there is no problem.  But if you have a 64-bit Ada compiler and
>a 32-bit C compiler (or vice-versa) it can't work.

  Presumably a 64 bit Ada compiler could be designed to work with a 32 bit
C compiler, with pragma Convention(C, an_access_type) causing
an_access_type to be a 32 bit pointer (with implied additional 32 bits
from a segment or base or just zero, for instance) rather than a 64 bit
pointer.  Such a compiler ought to be able to do System.Address <-> access
type conversions for 32 bit, as well as 64 bit, access types, but Ada's
System.Address_To_Access_Conversions could only work for one of those,
right?  Perhaps the vendor of such a compiler would offer (non-standard)
package System.Address_To_Access_Conversions.C
for doing the (32 bit or convention C) conversions.