On Jan 11, 2009, at 23:17, Bridger Maxwell wrote:
I have an NSSet which I need to iterate through and remove any
objects if
they fail a certain test (this is a client/server setup, so I am
testing the
connection to connected clients). However, if I remove an object
from the
set while iterating through it, I get this message logged to the
console.
**** Collection <NSCFSet: 0x10567e0> was mutated while being
enumerated.*
Is there a better way to remove objects from a set? Perhaps there is
a safe
iteration that allows objects to be removed? I supposed I could keep a
separate list of objects that need to be removed, and then remove them
afterwards, but that seems like a clunky solution.
Constructing a new set of the objects to be removed sounds clunky
until you do it, and then you find it's just a couple of lines of
inoffensive code.
It also has one advantage (in general) over removing the objects as
you iterate (if you could do it the easy way). Assuming you use
minusSet to remove the objects at the end of iterating, it generates a
single KVO notification for the whole operation instead of a KVO
notification for each removal. Sometimes that's a big win, other times
it doesn't matter much one way or another.
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