Ali Çehreli:
I don't think that should even be allowed. C functions should not know or be compatible with 'ref' D parameters. Define the arguments as simple 'double *' or 'const double *'.
Time ago I suggested something like that, that is not meaningful to accept extern(C) function signatures with ref, [], fixed-sized arrays, lazy arguments, associative arrays, pure, and so on, because the C side doesn't know about those things or can't enforce them (like purity). Walter didn't agree with me, but I didn't understand his answer (or I don't remember it now).
Bye, bearophile
