c++ strategy 패턴

using namespace std;

class GameCharacter;

//체력치 계산에 대한 기본 알고리즘을 구현한 함수

int defaultHealthCalc(const GameCharacter& gc);

int myHealthCalc(const GameCharacter& gc);

typedef int (*HealthCalcFunc)(const GameCharacter& );

class GameCharacter{

public:

    explicit GameCharacter(HealthCalcFunc hcf = defaultHealthCalc):healthFunc(hcf){}

    int healthValue() const { return healthFunc(*this); }

    void setHealthCalcFunc(HealthCalcFunc hcf){ this->healthFunc = hcf; }

private:

    //함수 포인터 선언

    HealthCalcFunc healthFunc;

};

int defaultHealthCalc(const GameCharacter& gc)

{

    cout << "defaultHealthCalc" << endl;

    return 0;

}

int myHealthCalc(const GameCharacter& gc)

{

    cout << "myHealthCalc " << endl;

    return 0;

}

int main()

{

    GameCharacter gc;

    gc.healthValue();

    gc.setHealthCalcFunc(myHealthCalc);

    gc.healthValue();

    return 0;

}