Hi, Julian Graham <jool...@gmail.com> skribis:
> I was playing around with some C code that uses the new R6RS > bytevector ports, and I noticed that there doesn't seem to be an easy > way (a la `let-values' or `receive') to access multiple return values > from C. I've resorted to doing: > > scm_struct_ref (foo, SCM_INUM0); > > ...which is almost certainly not future-proof. All I want to do is > access these values as a pair or list. Values were already structs in 1.8, so that’s OK. Perhaps this should be documented though, and C accessors could be provided. > Is there a Right Way to do that? Yes: write Scheme code! :-) In 1.8 multiple-values were always a struct, which had to be allocated each time multiple values were returned. In 2.0 it’s a struct only if it has to cross the Scheme/C boundary–otherwise the values are stored on the VM stack. Thanks, Ludo’.
