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'd say have it validate itself as long as the valid values don't depend on what other classes use NavigationData.

Basically, as long as latitude and pitch has to always be between +/- 90 degrees, and longitude and roll always be between +/- 180 degrees, keep the validator in the class.

(By the way, what about heading?)