Re: linked variable
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- Subject: Re: linked variable
- From: Rici Lake <lua@...>
- Date: Fri, 1 Dec 2006 01:01:15 -0500
On 1-Dec-06, at 12:31 AM, wang xu wrote:
Is there a generic way to automatically update one variable when the
value of another variable is changed?
No. (And why do you want to do that?)
The closest you can do is to implement your own "boxed" values, using
tables with a single key (say, 1):
val1 = {"a"}
val2 = val1
val1[1] = "b"
=val2[1]
You could dress it up in O-O notation:
do
local meta = {}
meta.__index = meta
function meta:set(v) self[1] = v end
function meta:get() return self[1] end
function Box(v)
return setmetatable({v}, meta)
end
end
val1 = Box("a")
val2 = val1
=val2:get()
val1:set("b")
=val2:get()