#include <iostream>
#include <memory>

using namespace std;

class Target {
    string s;
public:
    Target(string s) : s(s) {}
    virtual ~Target() = default;

    virtual void request(const string& contents) {
        cout << s << " send request to server: " << contents << endl;
    }
};

class Adaptee {
public:
    int value;
    Adaptee(int value) : value(value) {}
};

class Adapter : public Target {
    shared_ptr<Adaptee> a;
public:
    Adapter(shared_ptr<Adaptee> a) :
    Target("User " + to_string(a->value)), a(a) {}

    virtual void request(const string& contents) override {
        cout << "Adapted request" << endl;
        Target::request(contents);
    }
};


int main() {
    shared_ptr<Target> t = make_shared<Target>("User A");
    t->request("Hello");

    shared_ptr<Adaptee> adaptee = make_shared<Adaptee>(42);
    // Obviously this is invalid.
    // a->request();

    // But it works with adapter.
    shared_ptr<Target> adapter = make_shared<Adapter>(adaptee);
    adapter->request("Bye");
}