9.1 Multiple Values
See Multiple Return Values for general information about multiple result values. In addition to call-with-values (described in this section), the let-values, let*-values, letrec-values, and define-values forms (among others) create continuations that receive multiple values.
Returns the given vs. That is, values returns as
provided arguments.
Examples: |
| > (values 1) |
1 |
| > (values 1 2 3) |
1 |
2 |
3 |
| > (values) |
| (call-with-values generator receiver) → any |
| generator : (-> any) |
| receiver : procedure? |
Calls generator, and passes the values that
generator produces as arguments to receiver. Thus,
call-with-values creates a continuation that accepts any
number of values that receiver can accept. The
receiver procedure is called in tail position with respect to
the call-with-values call.
Examples: |
| > (call-with-values (lambda () (values 1 2)) +) |
3 |
| > (call-with-values (lambda () 1) (lambda (x y) (+ x y))) |
#<procedure>: expects 2 arguments, given 1: 1 |