Dictionary - a C++ template class to emulate VBScript's "Scripting.Dictionary" collection

In the examples below, the left side are taken directly from Microsoft published documentation for the Scripting.Dictionary ActiveX.  The right side is the equivalent C++ code using the Dictionary<> template.  As you can see, the syntax is nearly identical, with the only significant different is that the data types of the dictionary must to predefined, and the C++ methods require parentheses where the VBScript methods don't.

Summary of Public Interface:

// Dictionary.h: interface/implementation for the Dictionary class.
//
// Dictionary is a templatized class which is a direct copy of
// the VBScript Scripting.Dictionary object.  All methods
// and properties are provided with a syntax that is either
// identical to the VBS implementation, or with only trivial
// differences (mainly, C++ member functions require parentheses
// where VBScript methods don't)
//
// Copyright 1998, James M. Curran, All Rights reserved.
//  May be used freely, provided copyright noticed remains.
//  May not be sold in source code form.
//
// email: JamesCurran@Mvps.org
//   WWW: http://www.NJTheater.Com/JamesCurran
//////////////////////////////////////////////////////////////////////

template<typename KEY, typename ITEM>
class Dictionary  : std::map<KEY, ITEM>
{
public:
	Dictionary() {};
	virtual ~Dictionary(){};
	void			Add(KEY k, ITEM i);
	bool 			Exists(KEY k) 	const;
	size_type 		Count() 	const;
	void 			Remove(KEY k);
	void 			RemoveAll();
	std::vector<KEY>	Keys() 		const;
	std::vector<ITEM>	Items()		const;
	DKH			Key(KEY k);
	DIH			Item(KEY k);
	DIH 			operator[](KEY k);
	DIH 			operator()(KEY k);
	friend std::ostream& 	operator<<(std::ostream& os, const DIH& dih);
};

Note:   Anything above the returns a DIH or DKH can appear on either the right or left side of an assignment,  (although Key() is a bit pointless on the right hand side).  eg:

    dict.Item("a") = "Apple";
    dict("a") = "Apple";
    dict["a"] = "Apple";

are all legal (and equivalent).

Demo is included with header file.  Just compile & link a source file with the following three lines:

#define DICTIONARY_TEST
#include "dictionary.h"
void main()	{ dictionary_test();	}