ConcreteCache.swift

struct MemoryComposableCache<K, V>: ComposableCache {
    var getC: (K) -> V?
    var setC: (K, V) -> Void
    typealias Key = K
    typealias Value = V
}

struct DiscComposableCache<K, V>: ComposableCache {
    var getC: (K) -> V?
    var setC: (K, V) -> Void
    typealias Key = K
    typealias Value = V
}