Hi Al,
What combination of
* define-record-type (srfi-9, srfi-99, chicken define-record, whatever) and
* (declare type ...)
can I use to inform the compiler that (for collections of myrec) vector-
ref returns myrec's (likewise list car/cdr, hash-table-ref)? And that it
needs not emit any instance-type-checking code for objects extracted
from such collections?
For "native" Scheme types, there's at least `list-of` and `vector-of`
[0]. The type definitions of car/cdr, vector-ref, etc are in the file
types.db (you can find it at $PREFIX/lib/chicken/11/types.db).
For other data-structures you have to look at the specific
implementation. For example, SRFI-69 [1] mentions types in the
changelog. They're not mentioned in the docs, however, so you'll have to
dig through the code to confirm this.
Separately, how can I tell the compiler that fields in these records
have certain types? Add type declarations for the implicitly-defined
per-field accessors and mutators?
To annotate the types of the fields of a record, take a look at
defstruct[2]. There may be other alternatives, I only know of this one.
[0] https://wiki.call-cc.org/man/5/Types#type-syntax
[1] https://wiki.call-cc.org/eggref/5/srfi-69
[2] https://wiki.call-cc.org/eggref/5/typed-records#defstruct
Good luck!
siiky
