In C++ a class with at least one pure virtual function is called abstract class. You can not create objects of that class, but may only have pointers or references to it. If you are deriving from an abstract class, then make sure you override and define all pure virtual functions for your class. From … Read more
The reason the base class is abstract is this pure virtual function: The derived class DisablePairCollision attempts to define that function, but it does not do it correctly: As you can see, some of the arguments have different types. E.g. colObj0 is of type const btCollisionObject*, but it should be of type const btCollisionObjectWrapper*. Therefore, … Read more
For future people struggling with a similar problem, the situation is that the compiler simply cannot find the type you are using (even if your Intelisense can find it). This can be caused in many ways: You forgot to #include the header that defines it. Your inclusion guards (#ifndef BLAH_H) are defective (your #ifndef BLAH_H doesn’t match your #define BALH_H due … Read more
They can result if you try to make a virtual function call from a constructor or destructor. Since you can’t make a virtual function call from a constructor or destructor (the derived class object hasn’t been constructed or has already been destroyed), it calls the base class version, which in the case of a pure … Read more