Re: Adding params to functions

[Tom Wrensch <twrensch@...>]

Here are two possibilities:

First of all you can change the call code to this:

    Animation = LoadAnimation( "BlackDog.dat" )
    Animation:Play(1, 3)

(Note the change of the '.' to a ':' in the play call).

Another would be to build a closure to contain the extra information:

    function Anin_Index( t, i)
      if i == "Play" then
          return function(x, y) Play(t, x, y) end
      else
          return nil
      end
    end
                 
There are probably other ways to handle it, these are the two
that come to mind.

  - Tom Wrensch

On Mon, 13 May 2002, Denis Lamarche wrote:

> I am working in Lua 4.0.  This is what I have and what I want to do:
> 
> function Anin_Index( t, i )
>   if i == "Play" then
>     return Play
>   else
>     return nil
>   end
> end
> 
> function LoadAnimation( name )
>   return { NAME = name, ID = 1 }
> end
> 
> ...And I have a tag set to this table that overides the index method so that 
> when I do...
> 
> Animation = LoadAnimation( "BlackDog.dat" )
> Animation.Play( 1, 3 )
> 
> ..The Play will actually call the 'c' function Play(), but I also want the 
> ID of that table sent to 'C' with it.  How can this be done???  Can I add it 
> to the stack thats being sent to 'C' ???