[Qt-interest] Qt memory management.

[Ramesh]

Thanks Arnold :)
Have nice day.


-----Original Message-----
From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Arnold Krille
Sent: Wednesday, August 18, 2010 5:03 PM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Qt memory management.

On Wednesday 18 August 2010 13:10:25 Ramesh wrote:
> Fine andres..
> I do agree.. but what about this case.
>
> QString a = "foo"; // "QStringPrivate" has a refcount of 1 QString b =
> a;// Shallow copy of QStringPrivate, that now has a refcount of
> 2
> a = "chock" // in this case?
>
> If we change the value of a, then what about b?
>
>  b should point to "foo" right. So what happens in this case, I guess
> Deepcopy occurs right?

"Copy on write" means that whatever reference gets its value changed, it
checks for the ref-counter and if that is bigger then 1, it creates its own
copy to modify.
So after >a= "chock";<, a has "chock" and b still has "foo", both with a
ref- counter of 1.

Arnold


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