status: final (2016/1/18)See also SRFI 158: Generators and Accumulators.
This SRFI defines utility procedures that
create, transform, and consume generators. A generator is simply a
procedure with no arguments that works as a source of a series of values.
Every time it is called, it yields a value. Generators may be finite or
infinite; a finite generator returns an end-of-file object to indicate
that it is exhausted. For example,
read are generators that
generate characters, lines, and objects from the current input port.
Generators provide lightweight laziness.