#include <iostream>

#include <string>

#include <vector>

using namespace std;

class Flyweight {

public:

Flyweight(string state):_state(state) {

}

virtual void Operation(const string&state) { }

string GetState()const { return _state; }

virtual ~Flyweight() { }

private:

string _state;

};

class ConcreteFlyweight :public Flyweight {

public:

ConcreteFlyweight(string state)

:Flyweight(state) {

cout << "ConcreteFlyweight Build..." << state << endl;

}

void Operation(const string& state) {

cout << "ConcreteFlyweight " << GetState() << " \\ " << state << endl;

}

};

class FlyweightFactory {

public:

Flyweight *GetFlyweight(std::string key) {

for (auto fly : _flys) {

if (fly->GetState() == key) {

cout << "already created by users..." << endl;

return fly;

}

}

Flyweight *fn = new ConcreteFlyweight(key);

_flys.push_back(fn);

return fn;

}

private:

std::vector<Flyweight*> _flys;

};

int main() {

FlyweightFactory *fc = new FlyweightFactory();

Flyweight *fw1 = fc->GetFlyweight("hello");

Flyweight *fw2 = fc->GetFlyweight("world");

Flyweight *fw3 = fc->GetFlyweight("hello");

delete fw1;

delete fw2;

//delete fw3;

delete fc;

return 0;

}