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23-Apr 9:24 UTC
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[array] [object] [C] Some other questions

 [1/1] from: AJMartin::orcon::net::nz at: 24-Dec-2003 22:49


Mike wrote:
> 1) If I have an object - how do I create an array of objects with it ? > for example
<<quoted lines omitted: 3>>
> now I would want to have an array of objects of that type. >> help array
USAGE: ARRAY size /initial value DESCRIPTION: Makes and initializes a series of a given size. ARRAY is a function value. ARGUMENTS: size -- Size or block of sizes for each dimension (Type: integer block) REFINEMENTS: /initial -- Specify an initial value for all elements value -- Initial value (Type: any)
>> chicken: make object! [
[ tasty: "wings" [ ]
>> chickenfarm: array/initial 10 chicken
== [ make object! [ tasty: "wings" ] make object! [ tasty: "wings" ] make object! [ t...
> 2) How do you create custom types ? > I am talking of a way to emulate the typedef behavour in C ?
Not yet directly available in Rebol. :(
> How would you go to create an "enum" type in REBOL ?
Several ways:
>> foo: func [/bar /baz] [probe bar probe baz] >> foo/bar
true none == none
>> foo/bar/baz
true true == true
>> MyEnum: [Upper Lower Inbetween]
== [Upper Lower Inbetween]
>> index? find MyEnum 'Lower
== 2 Usually though, you'll find that there's not much need for enums in Rebol. :)
> 3) Back on objects: > objects seem to be pretty neat in REBOL - but I didn't find anything about
implementing and using constructor/destructors ?
> I know I could manually add a function that serves as constructor each
time I create an object, but is that the way REBOL requires it ? Here's a constructor:
>> chicken: make object! [
[ tasty: "wings" [ ] Looks like you've found it all ready! :) There's no need for a destructor in Rebol.
> 4) In the same context: > how do I actually 'free' memory/variables ? >> x: "A really large string! :)"
== "A really large string! :)"
>> x: none
== none
>> probe x
none == none More later. Andrew J Martin Speaking in tongues and performing miracles. ICQ: 26227169 http://www.rebol.it/Valley/ http://valley.orcon.net.nz/ http://Valley.150m.com/
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