CacheTest

using namespace std;
struct ObjectFactory2 {

    int count = 0;

    ObjectFactory2(int count) : count(count) {
    }

    ObjectFactory2() = default;

    ObjectPtr operator()(std::string id) {
        id += "_"s + to_string(count);
        ++count;
        return std::make_shared<Object>(std::move(id));
    }
};
void CacheTest() {
    using namespace std;
    {
        Cache<string, Object, ObjectFactory2> cache;

        auto alice1 = cache.GetValue("Alice"s);
        auto bob = cache.GetValue("Bob"s);
        assert(alice1 != bob);
        assert(alice1->GetId() == "Alice_0"s);
        assert(bob->GetId() == "Bob_1"s);

        auto alice2 = cache.GetValue("Alice"s);
        assert(alice1== alice2);
    } {
        ObjectFactory2 fc(10);
        Cache<string, Object, ObjectFactory2> cache(fc);

        auto alice1 = cache.GetValue("Alice"s);
        auto bob = cache.GetValue("Bob"s);
        assert(alice1 != bob);
        assert(alice1->GetId() == "Alice_10"s);
        assert(bob->GetId()== "Bob_11"s);

        auto alice2 = cache.GetValue("Alice"s);
        assert(alice1 == alice2);
    }
}