Re: Re: Antwort: global keyword instead of local
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- Subject: Re: Re: Antwort: global keyword instead of local
- From: tomas@...
- Date: 2000年8月28日 16:52:16 -0300 (EST)
> > In Python you can pass the function object as a default parameter to
> > work around this problem. However, I have no idea how to work around
> > this in Lua. Upvalues don't work, because the variable is created
> > after the function definition has been evaluated. Just for the fun of
> > it, ideas anyone?
>
> As you said, it's not straightforward, but you can do it with upvalues:
>
> function f()
> local g = {}
> g.f = function()
> %g.f()
> end
> end
Weird isn't it? I have never used anonymous functions in other
languages to make a comparison. Maybe there are a known solution. How
does it work in Lambda-calculus?
It also can be done with the debug API (BTW, I don't think it's
a better solution):
function anonymous(n)
if n < 0 then return end
print(n)
getstack(1,'f').func (n-1)
end
It does work in Lua 4.0 alpha!
Tomas