Reports whether or not a value is in a set, and if it exists returns the value indirectly.


func CFSetGetValueIfPresent(_ theSet: CFSet!, _ candidate: UnsafeRawPointer!, _ value: UnsafeMutablePointer<UnsafeRawPointer?>!) -> Bool



The set to examine.


The value for which to search in theSet. Comparisons are made using the equal callback provided when theSet was created. If the equal callback was NULL, pointer equality (in C, ==) is used.


Upon return contains the matching value if it exists in theSet, otherwise NULL. If the value is a Core Foundation object, ownership follows the The Get Rule.

Return Value

true if value exists in theSet, otherwise false.


This function uses the equal callback. candidate and all elements in the set must be understood by the equal callback. Depending on the implementation of the equal callback specified when creating theSet, the value returned in value may not have the same pointer equality as candidate.

See Also

Examining a Set

func CFSetContainsValue(CFSet!, UnsafeRawPointer!) -> Bool

Returns a Boolean that indicates whether a set contains a given value.

func CFSetGetCount(CFSet!) -> CFIndex

Returns the number of values currently in a set.

func CFSetGetCountOfValue(CFSet!, UnsafeRawPointer!) -> CFIndex

Returns the number of values in a set that match a given value.