Re: Defining a function argument during index lookup
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- Subject: Re: Defining a function argument during index lookup
- From: Edgar Toernig <froese@...>
- Date: 2001年12月27日 13:58:48 +0100
Peter Loveday wrote:
>[replace:]
>
> obj:FuncA(...)
> obj:FuncB(...)
> obj:FuncC(...)
>
> with:
>
> UsingObj(obj)
> FuncA(...)
> FuncB(...)
> FuncC(...)
>
> I have successfully set up the handler tables such that the global
> handler queries the active 'obj', and it will return FuncA (or whatever)
> as required. However, I cannot find a way to simulate the ':', which
> magically inserts obj as the first argument... I have tried pushing
> multiple values on to the stack from my handler, but it doesn't seem
> to help.
You have to create a new closure each time:
function global_index(glbl, name)
local func = find_function(name)
return function(...) return %func(obj, unpack(arg)) end
end
Not very efficient though...
It's faster if FuncA/B/C fetch obj by themself.
Ciao, ET.