how to overload = operator for pointers

Hi,

I want to copy the contents of one pointer into another pointer which
is of same type by overloading '=' and '()' operator. Please guide me
how to do it. I tried doing it but only got syntax error and some
times crash.

class loc
{
public:
    loc::loc() {
    }

    loc::loc(int longi, int lat) {
        longitude = longi;
        latitude =lat;
    }
loc* operator()(loc op2);
void show();
private:
int latitude;
int longitude;
};

void loc::show()
{
cout << "long=" << longitude << " lat=" << latitude << endl;
}

loc* loc::operator()(loc& op2)
{
cout << "pointer" << std::endl;
    void* temp = malloc(sizeof(op2));
    loc* loci = (loc *)temp;
    loci->longitude = op2.longitude;
    loci->latitude = op2.latitude;
    return loci;
}

int main()
{
loc *new1 = new loc(4, 6);
loc *new2(newLoc);
new2->show();
delete new1;
delete new2;
return 0;
}

But i output
long=4 lat=6
 "*** glibc detected *** double free or corruption (fasttop):
0x0000000000502010 ***"

+suresh