Re: equivalent of Perl's "AUTOLOAD"

[PA <petite.abeille@...>]

On Jun 27, 2006, at 13:27, George Jempty wrote:

> Is there an equivalent of Perl's "AUTOLOAD" in Lua?  Autoload is a 
> method
> that you implement that gets called when you call a method on an 
> object but
> that method name has not been defined.

Here is a little example of a 'proxy' class [1] which does this:

local aProxy = LUProxy()

aProxy:foo()
aProxy:bar()

Any method which do not exists get forwarded to, well, the 'forward' 
method.

Here is the bulk of the __index metamethod:

        self.__index =
        function( anObject, aKey )
                local aValue = self[ aKey ]

                if aValue == nil and aKey:byte( 1 ) ~= 95 then
                        aValue = function( anObject, ... )
                                return anObject:forward( aKey, ... )
                        end

                        setfenv( aValue, _forward )
                end

                return aValue
        end

Cheers

--
PA, Onnay Equitursay
http://alt.textdrive.com/


http://dev.alt.textdrive.com/browser/lu/LUProxy.lua