class Zsak
{
    public:
        Zsak();
        ~Zsak();
        void Add( int x );
        friend Zsak operator>>( const int a, Zsak b ) { b.Add( a ); return b; }
        friend Zsak operator+( const Zsak a, const Zsak b )
        {
            Zsak ret;
            list<int>::iterator i;

            a.zs.push_back(5);
            return ret;
        }
    private:
        list<int> zs;
};