[REBOL] Fun functions
From: al::bri::xtra::co::nz at: 5-Jan-2001 11:32
Here's a function that automatically handles the problem of words that
should be local to a function overwriting global words:
Fun: function [
"Automatic local word generation for a function."
Spec [block!] Body [block!]
][
Locals
][
Locals: make block! 0
foreach Value Body [
if set-word? :Value [
insert tail Locals to word! :Value
]
]
function Spec Locals Body
]
It does this by assuming that all set-word!s in a function body block are
meant to be local words. So this:
f: fun [bla] [t: 1 bla + t]
becomes:
>> f: fun [bla] [t: 1 bla + t]
>> probe :f
func [bla /local t][t: 1 bla + t]
>> t
** Script Error: t has no value
** Near: t
>> f 5
== 6
>> t
** Script Error: t has no value
** Near: t
IF your function needs to change a global word, then just use 'set, like
this:
fun [] [set 'print none]
Permission explicitly granted to Rebol Crew to use this function as they
wish.'
Happy New Year to all!
Andrew Martin
Feeling much better...
ICQ: 26227169 http://members.nbci.com/AndrewMartin/
