CFSetGetValueIfPresent(_:_:_:)
Reports whether or not a value is in a set, and if it exists returns the value indirectly.
Declaration
func CFSetGetValueIfPresent(_ theSet: CFSet!, _ candidate: UnsafeRawPointer!, _ value: UnsafeMutablePointer<UnsafeRawPointer?>!) -> BoolParameters
- theSet:
The set to examine.
- candidate:
The value for which to search in
theSet. Comparisons are made using the equal callback provided whentheSetwas created. If the equal callback wasNULL, pointer equality (in C, ==) is used. - value:
Upon return contains the matching value if it exists in
theSet, otherwiseNULL. If the value is a Core Foundation object, ownership follows the 20001148 SW1.
Return Value
true if value exists in theSet, otherwise false.
Discussion
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.