A first-class type-safe Swift cache based on NSCache with support for value types as keys.

Cache.swift

import Foundation

// Based on https://www.swiftbysundell.com/articles/caching-in-swift/

final class Cache<Key: Hashable, Value> {
    private let wrapped = NSCache<WrappedKey, Entry>()

    func insert(_ value: Value, forKey key: Key) {
        let entry = Entry(value: value)
        wrapped.setObject(entry, forKey: WrappedKey(key))
    }

    func value(forKey key: Key) -> Value? {
        let entry = wrapped.object(forKey: WrappedKey(key))
        return entry?.value
    }

    func removeValue(forKey key: Key) {
        wrapped.removeObject(forKey: WrappedKey(key))
    }
}

extension Cache {
    subscript(key: Key) -> Value? {
        get {
            return value(forKey: key)
        }
        set {
            if let value = newValue {
                insert(value, forKey: key)
            } else {
                removeValue(forKey: key)
            }
        }
    }
}

private extension Cache {
    final class WrappedKey: NSObject {
        let key: Key

        init(_ key: Key) { self.key = key }

        override var hash: Int { return key.hashValue }

        override func isEqual(_ object: Any?) -> Bool {
            guard let value = object as? WrappedKey else {
                return false
            }

            return value.key == key
        }
    }
}

private extension Cache {
    final class Entry {
        let value: Value

        init(value: Value) {
            self.value = value
        }
    }
}