Type Alias

CFSetRetainCallBack

Prototype of a callback function used to retain a value being added to a set.

Declaration

typealias CFSetRetainCallBack = (CFAllocator?, UnsafeRawPointer?) -> UnsafeRawPointer?

Parameters

allocator

The set’s allocator.

value

The value being added to the set.

Return Value

The value to store in the set, which is usually the value parameter passed to this callback, but may be a different value if a different value should be stored in the collection.

Discussion

This callback is passed to CFSetCreate(_:_:_:_:) in a CFSetCallBacks structure.

See Also

Callbacks

typealias CFSetApplierFunction

Prototype of a callback function that may be applied to every value in a set.

typealias CFSetCopyDescriptionCallBack

Prototype of a callback function used to get a description of a value in a set.

typealias CFSetEqualCallBack

Prototype of a callback function used to determine if two values in a set are equal.

typealias CFSetHashCallBack

Prototype of a callback function called to compute a hash code for a value. Hash codes are used when values are accessed, added, or removed from a collection.

typealias CFSetReleaseCallBack

Prototype of a callback function used to release a value before it’s removed from a set.