Re: Functional objects

[Ben Sunshine-Hill <sneftel@...>]

Why hardcode it when you can emulate it?

function makeobjforclosure(c)
    local t = {
        __index = function(t, k)
            return function(...)
                return c(k, ...)
            end
        end
    }
    setmetatable(t, t)
    return t
end

Untested, but should work.

Ben
On Tue, 21 Sep 2004 22:33:58 -0700, Mark Hamburg <mhamburg@adobe.com> wrote:
> PiL finishes the chapter on object-oriented programming with the rather
> Scheme-like approach of implementing objects as function closures. Would it
> make sense to define obj:msg( ... ) as meaning obj( "msg", ... ) if obj were
> a function? This has the downside of meaning that the syntax is no longer
> simply sugar, but it had already ceased to be treated as such in the
> implementation.
> 
> It might actually be nicer to have it mean obj( obj, "msg", ... ) but that
> may confuse parameter counts in the implementation since the case where obj
> isn't a function doesn't pass the message to the method.
> 
> Mark
> 
>