| | | dosequence | |
|
| (var sequence-form
[result-form]) declaration*
{tag | form}*=> result*or nil | [Macro] |
Purpose
A generalized dolist-style iterator for any sequence.
Package :gbbopen-tools
Module :gbbopen-tools
Arguments and values
| var | A variable symbol | |
| sequence-form | A form that evaluates to a sequence | |
| result-form | A form | |
| declarations | A declare expression (not evaluated) | |
| tag | A go tag (not evaluated)
| |
| form | A form | |
| results | The values returned by evaluating the last form |
Returns
If a return or return-from form is executed, then
the values passed from that form are returned; otherwise, the values
returned by evaluating the result-form are returned, or nil if
there is no result-form.
Description
The body of dosequence is like a tagbody.
Dosequence evaluates sequence-form, which should produce a
sequence. It then executes the body once for each element in the sequence,
with var bound to the element.
The scope of the binding of var does not include the sequence-form, but it does include the result-form.
Examples
> (dosequence (elt #(1 2 3)) (print elt)) 1 2 3 nil > (dosequence (char "abc") (print char)) #\a #\b #\c nil >
The GBBopen Project
| | | dosequence | |