Next: Hash Tables
Up: Basic Data Extensions
Previous: Procedure Names
MzScheme implements delay as a macro that expands to
make-promise. The force procedure can only be
applied to values returned by make-promise, and promises are
never implicitly forced.
- (make-promise thunk) returns a new promise, where
thunk is a procedure of zero arguments.
- (promise? v) returns #t if v is a promise
created by make-promise or #f otherwise.
PLT