Re: Why does this work?
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- Subject: Re: Why does this work?
- From: Roberto Ierusalimschy <roberto@...>
- Date: Fri, 4 Feb 2011 11:54:31 -0200
> For functions you can do
>
> do
> local v = 1
> a = function () print(v) end
> end
> b = a
> debug.setupvalue(b, 1, 2)
> a()
>
> To me this means that b is a reference to the same function as a. Am I correct?
Yes. BTW, you do not need the debug libray to make your point:
do
local state = 0
f = function (x) if x then state = x else return state end end
end
f1 = f -- both f and f1 refer to the same function now
f(10)
print(f1()) --> 10
(That is why sometimes we prefer to call them 'closures'; I think this
name makes clearer that it is a muttable object.)
-- Roberto