Re: Concept of static variables in Lua (like C)
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- Subject: Re: Concept of static variables in Lua (like C)
- From: meino.cramer@...
- Date: Sat, 7 Jul 2012 21:27:37 +0200
TNHarris <telliamed@whoopdedo.org> [12-07-07 21:20]:
> On Saturday, July 07, 2012 03:12:35 PM meino.cramer@gmx.de wrote:
> > Hi,
> >
> > is there a concept of static local variable in function
> > as it exist in C?
> >
>
> Lexical scoping and upvalues provide it.
>
> in C:
>
> int increment(){
> static int N = 0;
> N = N + 1;
> return N;
> }
>
> in Lua:
>
> local N = 0
> function increment()
> N = N + 1
> return N
> end
>
> --
> tom <telliamed@whoopdedo.org>
>
Hi Tom,
thanks for reply! :)
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 since
int increment(){
static int N = 0;
N = N + 1;
return N;
}
int decrement(){
N = N + 1;
return N;
}
the decrement() will fail with unresolved symbol or similiar...
How can I mimic this in Lua?
Best regards,
mcc