The Object-Oriented Text Star Trek Game in C++

/* ---------------------------------------------------------
Super Star Trek
C++ Port Copyright 2008, James M. Curran    <jamescurran@mvps.org>
based upon the C Port, Copyright 1996, Chris Nystrom
based upon the PC Basic port, Copyright 1978, Workman Publishing
based upon the HP Basic original, PD circa 1971, Mike Mayfield

C++ code licensed using the Code Project Open License v1.02
http://www.codeproject.com/info/cpol10.aspx
 -------------------------------------------------------------- */
#if !defined (OUTPUT_F_FILE_INCLUDED)
#define OUTPUT_F_FILE_INCLUDED

#include <iostream>
#include <ios>
#include <streambuf>

using std::cout;
using std::endl;
using std::ostream;
using std::cin;

#include <string>
using std::string;

struct IDisplayable
{
		virtual void DisplayOn(ostream&) const =0;
};


inline ostream& operator<< (ostream& os, const IDisplayable& Q)
{
	Q.DisplayOn(os);
	return os;
}

inline string center(const string text, int width)
{
	int len = text.length();
	if (len >= width)
		return text;

	int front = (width - len)/2;
	int back = front;
	if ((len & 1) == 1)
		++front;

	return string(front, ' ') + text + string(back, ' ');
}

inline void AnyKey()
{
	cout << "\n====Press [Enter] to continue ====";
		char c[2];
	cin.sync();
	cin.read(c, 1);
	cout << endl;
}


// NullDevice functions exactly like cout (and can be used in it's place)
// except text output through it isn't displayed anywhere.
// Good for the "other times" when sometimes you want something 
// displayed, and other time, you don't.
class NullDevice : virtual public   ostream 
{
public:
	NullDevice() : ostream(NULL, false) {}
};

extern NullDevice nulldev;

#endif	//defined (OUTPUT_F_FILE_INCLUDED)