Should a class validate itself or create another class to validate it?

Question

Let\'s say I have a class like:

class NavigationData
{
  float roll;
  float pitch;
  double latitude;
  double longitude;
}

and if I want to c

Answer 1

I would say it depends. If the class's data is validatable in isolation I would put the method in the class, but if the validation requires a context then I would create a validator class based on some interface.