#if !defined _LINK_
#define _LINK_
 
#if !defined _IOSTREAM_
#include _IOSTREAM_
#endif
 
typedef unsigned short int size_l;
 
template <typename T>
class list;
 
template <typename T>
class link
{
	typedef link<T>* link_p;
 
	T value;
	link_p next, previous;
public:
	link()
		: value(NULL), next(NULL), previous(NULL)
	{}
 
	link( T _value, link_p _next= NULL, link_p _previous= NULL )
		: value(_value), next(_next), previous(_previous)
	{}
 
	T rvalue() { return this->value; }
 
	link_p rnext() { return this->next; }
 
	link_p rprevious() { return this->previous; }
 
	const char* type() { return typeid(T).name(); };
 
	friend class list<T>;
 
	template <typename CharT>
    friend std::basic_ostream<CharT> &operator<< ( std::basic_ostream<CharT> &out, const link &_link )
	{
		out << _link.rvalue();
 
		return out;
	}
};
 
#endif /* _LINK_ */