[REBOL] Re: Dumb newbie Rebol question
From: andrew:martin:colenso:school at: 5-Sep-2003 15:31
parki wrote:
> 2. Any way to enforce some sort of Singleton idiom? I suspect that
asking this (and perhaps the above) are caused by not enough
indoctrination to the Rebol way of doing things, but wondering... I am
going to put the serial connection code into an object (again, keep
namespaces clean) and in Java, I'd make this a Singleton, as I only want
one serial connection open. Not sure how this should be tackled in
Rebol.
I'd have it something like this:
Your outside script does something like this:
do %X10.r ; Call the X10 script.
And your %X10.r script looks something like this:
Rebol [
File: %X10.r
;...
]
if not value? 'X10 [
X10: make object! [
]
]
So, even if the outside script does silly things like this:
do %X10.r ; Call the X10 script.
do %X10.r ; Call the X10 script.
do %X10.r ; Call the X10 script.
You'll only get the one object referred to by the word 'X10.
I hope that helps!
Andrew J Martin
Attendance Officer &
Information Systems Trouble Shooter
Colenso High School
Arnold Street, Napier.
Tel: 64-6-8310180 ext 826
Fax: 64-6-8336759
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