Strategy Pattern

class Character;

class King;
class Queen;
class Knight;
class Girl;

class Character {
public:
　　Character() {}
　　~Character() {}

public:
　　virtual void fight();

public:
　　void setName(std::string s);
　　std::string& getName();

private:
　　std::string name_;
};

void Character::setName(std::string s) {
　　name_ = s;
}

std::string& Character::getName() {
　　return name_;
}

void Character::fight() {
　　printf("Fight with sword.\n");
}

class King : public Character {

};

class Queen : public Character {
public:
　　void fight() {
　　　　printf("A queen never fight.\n");
　　}
};

class Women : public Character {
public:
　　void fight() {
　　　　printf("A woman never fight.\n");
　　}
};

class Children : public Character {
public:
　　void fight() {
　　　　printf("A child never fight.\n");
　　}
};

class Knight : public Character {

};

class Character;

class King;
class Queen;
class Knight;
class Women;
class Children;

class Weapon;
class Sword;
class Axe;
class Nothing;

class Weapon {
public:
　　Weapon() {}
　　~Weapon() {}

public:
　　virtual void useWeapon();
};

class Sword : public Weapon {
public:
　　void useWeapon() {
　　　　printf("Fight using sword.\n");
　　}
};

class Axe : public Weapon {
public:
　　void useWeapon() {
　　　　printf("Fight using axe.\n");
　　}
};

class Nothing : public Weapon {
public:
　　void useWeapon() {
　　　　printf("No need to fight.\n");
　　}
};


class Character {
public:
　　Character() {}
　　~Character() { delete weapon_; }

public:
　　void fight() {
　　　　weapon_->useWeapon();
　　}

　　void setWeapon(Weapon* w) {
　　　　weapon_ = w;
　　}

private:
　　Weapon* weapon_;
　　std::string name_;
};

class Queen : public Character {
public:
　　Queen() {
　　　　setWeapon(new Nothing);
　　}
};

class Women : public Character {
public:
　　Women() {
　　　　setWeapon(new Nothing);
　　}
};

class Children : public Character {
public:
　　Children() {
　　　　setWeapon(new Nothing);
　　}
};

class King : public Character {
public:
　　King() {
　　　　setWeapon(new Sword);
　　}
};

class Knight : public Character {
public:
　　Knight() {
　　　　setWeapon(new Axe);
　　}
};

1. 
class Nothing : public Weapon {
public:
　　void useWeapon() {
    　　printf("Fight with sticks.\n");
　　}
};

2. 
for all women, children
　　w.setWeapon(new Sword);
　　c.setWeapon(new Sword);