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@property attributes

@property attributes

@property attributes

Alright, I notice @property has some "convenient" attributes, copy and retain. But they behave pretty strangely. So assume:

//Beginning code
@Interface ClassA
@property (retain) NSString *str;

//Main prog

NSMutableString *myStr = [NSMutableString stringWithString: @"A String"];
ClassA *myA = [ClassA new];

NSLog (@"myStr retain count: %x", [myStr retainCount]);

//[myStr retainCount] at this point has a value of 1.

[myA setStr: myStr];
NSLog (@"myStr retain count: %x", [myStr retainCount]);

//retainCount is 2.

NSLog(@"myA variable : %@", myA.str);
NSLog(@"myA variable : %@", myA.str);

NSLog(@"myStr retainCount: %x", [myStr retainCount]);

//retainCount is now 4.
//End code.

So why is this? I'm not setting myA, I'm simply calling the getter. Doing [myA str] has the same effect. I'm curious what the code is like under the hood of that (retain) property. Does the getting have a ++ to retainCount? If so that's the stupidest concept I've ever heard of, unless there's a reason for increasing the retain when you just want to access it. Is there any way to call the getter without increasing the retain count? Aside from making my own setter of course.

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