[REBOL] Re: Hack
From: sunandadh:aol at: 28-Dec-2001 17:11
Hi Romano,
> I've read the Sunanda msg on escribe: you are right, hackf doesn't work in
> your example.
>
> But the reason is not that it is defined in a object, but that it is called
> with a path. Seems that where uses exactly the word of the path refinement
> which is normally a global word.
>
> Look at these examples (which use the old version of hack):
<snip>
> do in hacko 'hackf
> hacko/hackf
> do bind [hacko/hackf] in hacko 'self
>
> Only the third time the hack fails.
I think you mean the 2nd fails, the first and last work.
Unfortunately the 2nd is (in my work at least) just about the only way I ever
write function calls to functions in objects.
---
On a related subject, I'd like a way to get the name of an object. Example:
MyObject: make object! [a: 0 b: 0 c: 0]
MyFunc MyObject
...
MyFunc: func [obj [Object!]][
if error? [obj/a] [
Print [?? "is missing its 'a' variable"]
] ; if
] ;func
where we replace the "??" with the magic hack to dereference obj into
MyObject
.
Now I know I could sort of do it like this:
MyObject: make object! [a: 0 b: 0 c: 0]
MyFunc "MyObject"
...
MyFunc: func [obj-String [String!] /local obj][
obj: get to-word obj-string
if error? try [obj/a] [
Print [Obj-string "is missing its 'a' variable"]
] ; if
] ;func
But that feels like a workaround to me, and for precise functional
equivalence, I need to add in the check that Obj is an object.
Any ideas?
Sunanda.
