~= operator in Swift

Question

I recently downloaded the Advanced NSOperations sample app from Apple and found this code...

// Operators to use in the switch statement.
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Answer 1

You can look into Define Swift

func ~=(pattern: I, value: I.Bound) -> Bool
func ~=(lhs: _OptionalNilComparisonType, rhs: T?) -> Bool
func ~=(a: T, b: T) -> Bool
func ~=(pattern: Range, value: I) -> Bool