Re: need help with __index and __newindex

[Merick <Merick_TeVaran@...>]

Thanks, that works nicely. It should help me out with automating the 
equalizer settings for the sound library I'm using.

One thing though, how do I need to change it to  get it to work for 
something like this:

b = {op1 = 9,op2 = 8,op3 = 7,op4 = 6,op5 = 5}
eq.chan1 = b

or even this:

preset1 = {
   chan1 = {op1 = 66,op2 = 66,op3 = 66,op4 = 4,op5 = 66},
   chan2 = {op1 = 66,op2 = 66,op3 = 66,op4 = 4,op5 = 66},
   chan3 = {op1 = 66,op2 = 66,op3 = 66,op4 = 4,op5 = 66}
   }

eq = preset1

I tried just using setmetatable(eq, get_mt_mirror(_eq)), but that seems 
to remove the metatables from the subtables.

"Mauro Iazzi" <mauro.iazzi@gmail.com>  wrote:
> In the __index and __newindex you are getting/setting the fields of
> _eq, not those of _eq.chain*.
> check
>
> print(eq.chan1.chan2)
>
> even before setting anytihg in the tables, just after the setmetatable
> statements.
>
> You should make the metatable aware of which mirror it should use. I
> would try a generator function approach. It would make easy to do it
> all automatically with a metatable for eq.
>
> It would work like this
>
> function get_mt_mirror(orig)
>   return {
>    __index = function(t,k)
>        print("index",t,k)
>        return orig[k]
>    end,
>      __newindex = function(t,k,v)
>        print("newindex",t,k,v)
>        orig[k] = v
>    end
>    }
> end
>
> setmetatable(eq.chan1, get_mt_mirror(_eq.chan1))
> print(eq.chan1.op3)
>
> cheers,
>
> --mi