Re: Concept of static variables in Lua (like C)
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- Subject: Re: Concept of static variables in Lua (like C)
- From: Drake Wilson <drake@...>
- Date: Sat, 7 Jul 2012 14:35:56 -0500
Quoth meino.cramer@gmx.de, on 2012年07月07日 21:27:37 +0200:
> A small modification of your code:
> local N = 0
> function increment()
> N = N + 1
> return N
> end
>
> function illegal_decrement()
> N = N - 1
> return N
> end
>
>
> In this case illegal_decrement should not have access to N
[...]
You can wrap the first part in a do..end block so that the scope of N
ends after the increment function is defined:
do
local N = 0
function increment()
N = N + 1
return N
end
end
However, note that then illegal_decrement will access the global N
(and fail if it's not a number), since global accesses are not checked
at load time in plain Lua. Additionally, local definitions are not
visible past the end of a chunk, so if you're only worried about
functions in other chunks then you're fine either way.
---> Drake Wilson