Re: Ideas for sugary 'new object' syntax ?
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- Subject: Re: Ideas for sugary 'new object' syntax ?
- From: Tom Wrensch <twrensch@...>
- Date: 2002年3月14日 07:43:08 -0800 (PST)
I put together a C lib that adds some meta tables and functions for making
objects in 4.1-work4. It defines a class stored in the global variable
Object (I'm a big Smalltalk fan). This is what I do for syntax:
-- Declare Shape, Circle, and Square classes
Shape = class(Object)
Circle = class(Shape)
Square = class(Shape)
Not much fun, but very flexable. I origionally used this:
-- Declare a Square class
Shape = class {
_parent = Object,
_init = function(self, x, y, side)
self.x = x
self.y = y
self.side = side
end
-- put rest of definition here
}
In both cases new objects were created this way:
mySquare = Square:new(10,10,20)
The new function (inherited from Object) calls _init if it exists.
One interesting variation that I consdered for defining a class was this:
Square = class(Shape) {
_init = function(self,x,y,side)
self.x = x
self.y = y
self.side = side
end
-- rest of definition goes here
}
This was done by having class(Shape) return a function that built a new
object with Shape as the superclass. I decided it was too cute and gave up
on it. Besides it looks WAY to much like C++!
- Tom
On 2002年3月13日, kaishaku13 wrote:
> Just curious what clever methods for object
> instantiation people have come up with..
>
> I currently use :
> foo = new_ObjectName(params)
>
> I suppose you could make a 'new' global
> and do something like new.Object...
>
> Or possibly have a global tag for each tag
> type you have which would hold 'static methods'
> and do Object.New or Object.Create...
>
> Those are my only ideas, and I'm wondering if
> there are some tricks to the lua syntax that
> might allow something more... 'sugary' to users
>
>