Name
NSMutableSet — Mac OS X 10.0
Synopsis
This class extends the functionality of NSSet
by
allowing objects to be added to and removed from
the set; NSSet
does not allow clients to add,
remove, or replace objects in a set after initialization. This
mutable subclass of NSSet
provides an interface
for those operations.
To add an object to a mutable set, use the method
addObject
:. If the object is already present in
the set, this method has no effect. When an object is added to a set,
it is sent a retain
message by that set. The
method removeObject
: will remove the specified
object from the set if it is a member. When an object is removed from
a set, it is sent a release
message by the set to
counteract the retain
message it was sent when
added to the set.
NSMutableSet
also implements a number of methods
that are useful for combining sets in various ways. The method
unionSet
: will add each member of the parameter
set into the receiver if the receiver does not already contain that
object. The method minusSet
: will remove from the
receiver each object that is present in both sets, while the method
intersectSet
: will remove from the receiver each
object that isn’t a member of the set specified in
the argument.
NSMutableSet
is toll-free bridged with the Core
Foundation type CFSet
. As such,
NSMutableSet
objects can be used interchangeably
with the CFSet
pointer type,
CFSetRef
.
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