piece_id.h

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#ifndef PIECE_ID_H
#define PIECE_ID_H
 
#include <iosfwd>
 
class piece_id
{
public:
  int get() const noexcept { return m_value; }
 
private:
  piece_id();
 
  static int sm_next_value;
 
  int m_value;
 
  friend piece_id create_new_id() noexcept;
};
 
piece_id create_new_id() noexcept;
 
void test_id();
 
bool operator==(const piece_id& lhs, const piece_id& rhs) noexcept;
bool operator!=(const piece_id& lhs, const piece_id& rhs) noexcept;
 
std::ostream& operator<<(std::ostream& os, const piece_id& i) noexcept;
 
#endif // PIECE_ID_H