Question

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C++: What is the size of an object of an empty class?

if the class does not have any data member and just has the mehod, it still has a chance of memory leak. First the class method is reference to class object and object still needs memory to store the address when allocating. Am I correct?

class Empty
{
  doA()
  {
  }
};

Answer 1

if the class does not have any data member and just has the mehod, it still has a chance of memory leak.

Yes, you can still leak memory on that type. You can leak on any type, even a type with no members. sizeof(EmptyClass) will never equal 0. See: http://www.stroustrup.com/#sizeof-empty

From the spec:

The size of a most derived class shall be greater than zero.