// In header: <boost/date_time/constrained_value.hpp>
template<typename rep_type, rep_type min_value, rep_type max_value, 
         typename exception_type> 
class simple_exception_policy {
public:
  // types
  typedef rep_type value_type;
  // member classes/structs/unions
  struct exception_wrapper : public exception_type {
    // public member functions
    operator std::out_of_range() const;
  };
  // public static functions
  static rep_type min BOOST_PREVENT_MACRO_SUBSTITUTION();
  static rep_type max BOOST_PREVENT_MACRO_SUBSTITUTION();
  static void on_error(rep_type, rep_type, violation_enum);
};