Re: private construction on GCC

I get an access exception on Release() on GCC but worked on different
compiler, I am trying to figure out if there is anything with this
code in a header:

class CountObject {
private:
long count;
public:
CountObject() : count(0) {}
CountObject(const CountObject&) : count(0) {}
virtual ~CountObject() {}
CountObject& operator=(const CountObject &) { return *this; }

void Grab() { count++; }
void Release() {
          if (count > 0) count--; //< Exception Here
          if (count <= 0) {
             delete this;
           }
}

// attribute functions
long Count() const { return count; }
};

Any insight would be helpful. What is the best way (most standard) to
prevent this problem.