//===========================================================================
// Class declaration for data items.
// A. Fischer, May 29, 2001                      		     file: item.hpp
//===========================================================================
#pragma once
#include <climits>
#include "ordered.hpp"

//--------------------------------------------------------------------------
template <class T>
class Item: public Ordered<typename T::KeyType> {
private:
	T* base;
public:
	Item() : base(new T()) {}	// called when creating dummy header cell
	Item(T* dt) : base(dt) {}
	virtual ~Item() {
		if (base==nullptr) cout << "  Deleting nullptr Item\n";
		else {
			cout << "  Deleting Item " << base->key() << "\n";
			delete base;
		}
	}
	void voidItem() { base=nullptr; } // Call before deletion to protect base
	operator T*() { return base; } // Cast Item to T*
	ostream& print(ostream& out) const { return base->print(out); }


	// Promises fulfillment
	typename T::KeyType key() const { return base->key(); }
	bool operator==(const typename T::KeyType& k) const {
		return base->key() == k;
	}
	bool operator<(const typename T::KeyType& k) const {
		return base->key() < k;
	}
};
//---------------------------------------------------------------------------
template <class T>
inline ostream& operator <<(ostream& out, const Item<T>& it) {
	return it.print(out);
}