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User's Guide to the GNU Objective-C Class Library

12.1 Safe vs Unsafe Enumerating

The simple enumerators operate on the collection in-place. If the contents of the collection change during the enumeration, you must use the "safe" version of the enumerator instead.

It works by making a shallow copy of the receiver, performing the enumeration using the shallow copy, then freeing the shallow copy.

All enumerators have both "safe" and plain versions.

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