ARC & Non-ARC

In a non-ARC environment this Rules to remember

• You have ownership of any objects you create.
• You can take ownership of an object using retain.
• When no longer needed, you must relinquish ownership of an object you own.
• You must not relinquish ownership of an object you don’t own.

Take ownership of a object in this methods which name likes

• alloc
• new
• copy
• mutableCopy
• and “retain” also take the ownship

In ARC , follow below rules

• Forget about using retain, release, retainCount, and autorelease.
• Forget about using NSAllocateObject and NSDeallocateObject.
• Follow the naming rule for methods related to object creation.
• Forget about calling dealloc explicitly.
• Use @autoreleasepool instead of NSAutoreleasePool.
• Forget about using Zone (NSZone).
• Object type variables can’t be members of struct or union in C language.(__bridge __bridge_retain __bridge_transfer)
• ‘id’ and ‘void*’ have to be cast explicitly.

the property qualifier means