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svn: r18706
This commit is contained in:
Eli Barzilay 2010-04-01 07:46:01 +00:00
parent 581cbb461b
commit 05fca5df14
1 changed files with 6 additions and 3 deletions
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9
collects/scribblings/reference/sequences.scrbl
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@ -325,12 +325,15 @@ sequence; if no more elements are available, the
@section{Iterator Generators}
@defmodule[scheme/generator]
@defform[(generator body ...)]{ Creates a function that returns a
value, usually through @scheme[yield], each time it is invoked. When
the generator runs out of values to yield the last value it computed
@defform[(generator () body ...)]{ Creates a function that returns a
value through @scheme[yield], each time it is invoked. When
the generator runs out of values to yield, the last value it computed
will be returned for future invocations of the generator. Generators
can be safely nested.
Note: the first form must be @scheme[()], and in the future this will
hold argument names that are used in the initial generator call.
@examples[#:eval (generator-eval)
(define g (generator
(let loop ([x '(a b c)])