Re: -isEqual: equals '==' ?

[Bissell, Tim]

On Sunday, Oct 19, 2003, at 06:41 Europe/London, Richard 
Frith-Macdonald wrote:

> On Sunday, October 19, 2003, at 06:24 AM, Yen-Ju Chen wrote:
>
> > Hi,
> >
> >  Is -isEqual: the same as '==' ?
>
> No (though it might be implemented that way for a particular class).
To clarify; == compares two pointers - if they point to the same 
address/object in memory they are
equal, otherwise they are not.  -isEqual:  compares two OBJECTS for 
equality -you may have
two NSString object instances  with the same contents:  "Foo" - they 
would return true for
'-isEqual:' but false for ==.



--------------------------------------------------------------------------------
The information contained herein is confidential and is intended solely for the
addressee. Access by any other party is unauthorised without the express
written permission of the sender. If you are not the intended recipient, please
contact the sender either via the company switchboard on +44 (0)20 7623 8000, or
via e-mail return. If you have received this e-mail in error or wish to read our
e-mail disclaimer statement and monitoring policy, please refer to 
http://www.drkw.com/disc/email/ or contact the sender.
--------------------------------------------------------------------------------