27.12

#include <cstring>
#include <iostream>
#include <vector>

using namespace std;


class Ability
{

public:
    virtual void activate() = 0;

};

class HealAbility:public Ability
{
public:
    virtual void activate()
    {
        cout << " Unit is healing\n";
    }
};

class DiggingAbility :public Ability
{
public:
    virtual void activate()
    {
        cout << " Unit is Digging\n";
    }
};

class StealthAbility :public Ability
{
public:
    virtual void activate()
    {
        cout << " Unit is Steal\n";
    }
};

class NullAbiliti :public Ability
{
    void activate()
    {

    }
};

class Unit
{

    Ability* sa;

public:
    Unit()
    {
        sa = new NullAbiliti;
    }
    void ActiveteAbility()
    {
        sa->activate();
    }
    void setAbility(Ability*other_sa)
    {
        delete[] sa;
        sa = other_sa;
    }
    virtual void move()
    {
        cout << "Move\n";
    }
    virtual void attack()
    {
        cout << "Attack\n";
    }
};

class Soldier : public Unit
{
public:


    void move()
    {
        cout << "Soldier moves\n";
    }



    void attack()
    {
        cout << "Soldier attacks\n";
    }
};

class Knight : public Unit
{
public:
    void move()
    {
        cout << "Knight moves\n";
    }
    void attack()
    {
        cout << "Knight attacks\n";
    }
};

class Worker : public Unit
{
public:
    void move()
    {
        cout << "Worker moves\n";
    }
    void attack()
    {
        cout << "Worker attacks\n";
    }
};



void main()
{
    vector <Unit*>v;
    v.push_back(new Soldier);
    v.push_back(new Knight);
    v.push_back(new Worker);
    for (auto obj : v)
    {
        obj->move();
        obj->attack();
    }

    Unit*p = new Soldier;
    p->setAbility(new HealAbility);
    p->ActiveteAbility();

    system("pause");
}