Mailing List Archive: 49091 messages
  • Home
  • Script library
  • AltME Archive
  • Mailing list
  • Articles Index
  • Site search
 

[REBOL] Re: Links ? Pointers ?

From: izkata:gmai:l at: 25-Aug-2009 2:09

He's talking about the possibility of multiple variables pointing at an immutable value:
>> X: make object! [Name: {Spock}] >> A: B: :X
Then, say, changing the object entirely:
>> X: make object! [Species: {Human}]
and having A and B now also point to the new object. 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. 2009/8/25 Semseddin Moldibi [ Bircom ] <semseddinm-bircom.com>:
>> >> Hello, I whish to ask a question to REBOL professional developers: >> >> If we have: >> >> A: [1 2 3] >> B: C: :A >> >> B and C would share the same list of A >> >> If we set A >> >> A: ["something"] >> >> B and C would point to the list [1 2 3] and A to ["something"] > > This is because you created a new variable, not changed value(s) of A. > If you use insert/replace/remove/clear and other series functions then > A, B and C will point to the same variable. > > -- > To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject. >
-- =E5=A5=8F=E3=81=A7=E3=81=A6=E5=A4=A2