A weak-to-strong map table. It is inspired by NSMapTable but guarantees thread safety and deals better with weak references. NSMapTable.weakToStrongObjects() doesn't free the value object when the key object is deallocated but WeakMapTable does.

public func value(forKey key: Key) -> Value?
public func value(forKey key: Key, default: @autoclosure () -> Value) -> Value
public func forceCastedValue<T>(forKey key: Key, default: @autoclosure () -> T) -> T
public func setValue(_ value: Value?, forKey key: Key)

Podfile

pod 'WeakMapTable'

WeakMapTable is under MIT license. See the LICENSE file for more info.