#include <iostream>
#include <vector>

using namespace std;

// a simple class that refcounts an integer
class smartptr
{
public:
	smartptr(int nr)
	{
		m_ptr = new int[2];
		m_ptr[0] = 1;
		m_ptr[1] = nr;
		cout << "Created " << nr << endl;
	}
	smartptr(const smartptr& rhs) : m_ptr(rhs.m_ptr)
	{
		if(m_ptr)
			++m_ptr[0];
	}
	~smartptr()
	{
		if(m_ptr && !--m_ptr[0])
		{
			cout << "Deleting " << m_ptr[1] << endl;
			delete[] m_ptr;
		}
	}
private:
    int* m_ptr;
};

int main()
{
    vector<smartptr> testVector;
    cout << "Adding..." << endl;
    for(int i = 0; i < 24; ++i)
        testVector.push_back(smartptr(i));
    cout << "Removing testVector[12]..." << endl;
    testVector.erase(testVector.begin() + 12);
    cout << "Clearing" << endl;
    testVector.clear();
    cout << "Done" << endl;

    return 0;
}