[REBOL] Re: R: Re: Links ? Pointers ?
From: carl:cybercraft at: 27-Aug-2009 17:53
On Wednesday, 26-August-2009 at 20:02:39 Giuseppe Chillemi wrote,
>> He's talking about the possibility of multiple variables
>> pointing at an immutable value:
>>
>> >> X: make object! [Name: {Spock}]
>> >> A: B: :X
>
>You are right !
>
>> Then, say, changing the object entirely:
>> >> X: make object! [Species: {Human}]
>> and having A and B now also point to the new object.
>
>You have interpreted correctly my message.
>
>> Here's a way to simulate it:
>> >> X: reduce [make object! [Name: {Spock}]]
>> >> A: B: X
>> >> X/1: make object! [Species: {Human}]
>> Now, A/1 and B/1 also point at the new object.
>
>I whish a more direct way able to be able to link to a function and have
>many object point to that function and reuse the code.
Ok. Try ALIAS...
>> alias 'x "aa"
== aa
>> alias 'x "bb"
== bb
>> x: make object! [name: "Spock"]
>> probe x
make object! [
name: "Spock"
]
>> probe aa
make object! [
name: "Spock"
]
>> probe bb
make object! [
name: "Spock"
]
>> aa: make object! [species: "human"]
>> probe x
make object! [
species: "human"
]
>> probe bb
make object! [
species: "human"
]
>> probe aa
make object! [
species: "human"
]
ALIAS only works if the words haven't already been used though. So this doesn't work...
>> alias 'bb "cc"
** Script Error: Alias word is already in use: cc
** Near: alias 'bb "cc"
-- Carl Read.
