Why did I get the error “error C2259: … cannot instantiate abstract class”?

Question

Any help is appriciated. I\'m working on a C++ factory pattern and i get this error.

1>c:\\users\\brian\\documents\\visual studio 2010\\projects\\cst276lab_3\\guitar.hpp

Answer 1

class GuitarComponentFactory 
  {
     public: virtual ~GuitarComponentFactory() = 0 {}
  };

In your derived ElectricGuitarComponentFactory you don't provide a destructor, hence it's still an abstract class.