#include "direction.hh"
#include "posexcept.hh"



/* *** Constructors *** */


Direction::Direction(const char source)
{
  direction = source ;
  assert_valid() ;
}



/* *** Operations *** */


inline void Direction::assert_valid() const
{
  if (! is_valid())
    throw bad_direction(direction) ;
}


inline bool Direction::is_valid() const
{
  return direction > 0 && direction <= 4 ;
}



/* *** Operators *** */


const Direction& Direction::operator=(const Direction &source)
{
  direction = source.direction ;
  return *this ;
}


const Direction& Direction::operator=(const char source)
{
  direction = source ;
  assert_valid() ;
  return *this ;
}


Direction::operator std::string() const
{
  switch (direction)
    {
    case north:
      return "north" ;
    case east:
      return "east" ;
    case south:
      return "south" ;
    case west:
      return "west" ;
    }
  return "Bad direction!" ;
}



std::ostream& operator<<(std::ostream &os, const Direction &d)
{
  os << static_cast<int>(d) ;
  return os ;
}