What copy attribute does in objective c

Question

Possible Duplicate:
Xcode property attributes (nonatomic , copy , strong , weak)

I want to know the Copy attribute working process with any example. Thanks

` copy" is required when the object is mutable. Use this if you need the value of the object as it is at this moment, and you don't want that value to reflect any changes made by other owners of the object. You will need to release the object when you are finished with it because you are retaining the copy.` http://stackoverflow.com/questions/9859719/xcode-property-attributes-nonatomic-copy-strong-weak — janusfidel, Aug 22 '12 at 12:35

score 0 · Answer 1 · edited May 23 '17 at 12:24

0

copy - "Specifies that a copy of the object should be used for assignment. ... The previous value is sent a release message." Basically same as retain, but sending -copy rather than -retain.

The retain/copy concepts come from the reference-counted memory management system.

Essentially, when used with @synthesize directive (to synthesize the property accessors you would otherwise write - like -person or -setPerson:), it determines how memory is managed inside the setter.

check out this previous asked question's answer

edited May 23 '17 at 12:24

Community

1
1

answered Aug 22 '12 at 12:37

Ravi Sharma

975
11
29

The previous value is *not* sent a `release` message. – Jonathan Grynspan Aug 22 '12 at 12:46
Actually it is, else the previous value would leak. – Analog File Aug 22 '12 at 14:31

What copy attribute does in objective c

1 Answers1