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

Depends...

Sometimes the validations are not part of the class itself, but business logic, and adding it to the class would prevent reutilization, and therefore, the usage of a validating class is good. Otherwise, the class should be able to validate itself.