Asp Forum - simple newbie question

kieran kirwan

1/26/2006 1:58:00 AM

Hi,
I have a piece of code below in which I;
1.....make a new NumberList object and append two MyNumber objects.
2.....copy the NumberList object and append a further MyNumber object.
However after this both objects are the same.
Any help would be greatly appreciated.
Thanks,
Kieran

---------------------------------------------------
class MyNumber
def initialize(x)
@x=x
end
attr_accessor :x
end
class MyNumberList
def initialize
@nums = Array.new
end
def append(num)
@nums.push(num)
self
end
def sum
sum=0
@nums.each {|s| sum += s.x }
return sum
end
end

zl1=MyNumberList.new; zl1.append(MyNumber.new(10));
zl1.append(MyNumber.new(20))
puts zl1.sum
zl2=zl1; zl2.append(MyNumber.new(40))
puts zl1.sum
puts zl2.sum

--
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2 Answers

dblack

1/26/2006 2:14:00 AM

Eric Jacoboni

1/26/2006 12:26:00 PM

kieran kirwan <kieran.kirwan@dto.ie> writes:

> Hi,
> I have a piece of code below in which I;
> 1.....make a new NumberList object and append two MyNumber objects.
> 2.....copy the NumberList object and append a further MyNumber object.
> However after this both objects are the same.
> Any help would be greatly appreciated.

See <http://www.rubygarden.org/ruby?Make_A_Deep_Copy_Of_An_...

> zl2=zl1;

As said, you doesn't copy the contents of zl1 in zl2: you make zl2 and
zl1 reference the same objet. What you want to do is to copy the
*contents* of zl1 into zl2.

--
Eric Jacoboni, ne il y a 1441718614 secondes

comp.lang.ruby

simple newbie question

kieran kirwan

dblack

Eric Jacoboni

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