Re: copying objects

I believe this code will act as you'd expect--that is you'd get new 
references to the same objects, not new objects.  In most OO languages, 
object copies are not directly availible, unless they are specifically 
implemented by a method (e.g. foo.getCopy()) because there is ambiguity 
as to what a copy would be (shallow or deep, etc.).  You will need to 
do something like the following:

Object: MyObject {

	+ to get-copy:
		return (new MyObject) init-with what ever parameters I need to pass 
to get the copy I want.
}

then you can iterate over the list and assign 'newObject = (oldObject 
get-copy).' and push it onto the list.

-e

On Tuesday, March 2, 2004, at 03:01 PM, Will Davis wrote:

> Raphael Crawford-Marks wrote:
>
>> Is there an easy way to copy objects?
>>
>> I need to copy a list of objects, and copylist only gives me a new 
>> list with the
>> same objects.  Do I need to create a custom method for this, or is 
>> there a
>> built-in way of doing it?
>>
>> Thanks,
>>
>> Raphael
>>
>>
>>
> list (list).
> newlist (list).
> item (object).
> newitem (object).
>
> foreach item in list: {
>    newitem = item.
>    push newitem onto newlist.
> }
>
> Dunno if there's a custom list-copy method, but the code above should 
> do it.
>
Eric DeWitt
[email protected]
School of Cognitive Science
Hampshire College

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