Marker issue

#include <iostream>

struct Child
{
    int* m_pMarker;
    Child() { m_pMarker = NULL; }
    void subDraw( int& marker )
    {
        marker++;
        m_pMarker = &marker;
        draw();
    }

    void draw()
    {
        if( m_pMarker )
        {
            std::cout << "Child marker is " << *m_pMarker << std::endl;
        }
    }
};

struct Parent
{
    Child m_child;
    void draw()
    {
        int* pMarker = new int;
        *pMarker = 0;
        m_child.subDraw( *pMarker );
        delete pMarker;
        pMarker = NULL;
    }
};

int main()
{
  Parent p;
  p.draw();
  p.m_child.draw();
}