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

Your class should be designed such a way and provide such methods that validate() is always true:

• after any public constructor invoked
• before and after any public method is invoked
• (in C++-land) before destructor is invoked

Such validate() methods are called class invariants and are important part of Design by Contract.