Re: static (class) variables

[Nagaev Boris <bnagaev@...>]

On Sun, Nov 22, 2015 at 8:30 PM, Andreas Matthias
<andreas.matthias@gmail.com> wrote:
> In the code below I tried to define a static (class) variable `Display.count'.
> It seems to work at first. But doesn't work any more once you rename the class.
> What's the correct way to get static variables?
>
> Andreas
>
>
>
> Display = {}

Do not use global variables.

> Display.count = 0
>
> function Display:new ()
>    local me = {}
>    setmetatable(me, self)
>    self.__index = self
>    Display.count = Display.count + 1
>    return me
> end
>
> function Display:getCount ()
>    return Display.count
> end
>
> dis1 = Display:new()
> dis2 = Display:new()
> print(dis1:getCount(), dis2:getCount())
>
> -- now let's rename Display
> DDD, Display = Display, nil
>
> dis = DDD:new()
> print(dis:getCount())
>
>



-- 


Best regards,
Boris Nagaev