#include <iostream>
#include <vector>
using namespace std;
 
class base
{
    private:
            int k;
    public:
            base(const base& b){ this->k = b.k; cout<<"  c-ctor "<<endl; }
            base(int a = 10){ k = a; }
 
            ~base(){cout << "destructor called\n";}
};
 
int main()
{
    base b, b1(2);
    vector<base> m;
    cout << "first pushback" <<endl;
    m.push_back(b);
    cout << "2nd pushback" <<endl;
    m.push_back(b1);
    cout << "3rd pushback" <<endl;
    m.push_back(b1);
    cout << "4th pushback" <<endl;
    m.push_back(b);
    cout << "5th pushback" <<endl;
    m.push_back(b);
    cout<<" =============================================== "<<endl;
 
    cout<<endl;
    return 0;
}

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