OSAllocatedUnfairLock

gistfile1.txt

class Cache<Key: Hashable, Value> {
    private let _cache: OSAllocatedUnfairLock<[Key: Value]>
    
    init() {
        _cache = OSAllocatedUnfairLock(initialState: [:])
    }
    
    func get(_ key: Key) -> Value? {
        _cache.withLock { cache in
            cache[key]
        }
    }
    
    func set(_ key: Key, value: Value) {
        _cache.withLock { cache in
            cache[key] = value
        }
    }

}