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// $Id: Year.hh,v 1.2 2002/12/19 18:40:45 flaterco Exp $
// Year
// The original rationale for this class had to do with enforcing the
// epoch limitation (1970-2037). Now it's pretty pointless except
// maybe for overload resolution.
/*
Copyright (C) 1997 David Flater.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
class Year {
protected:
unsigned value;
friend int operator == (Year y1, Year y2);
public:
Year ();
Year (unsigned year);
unsigned val();
// Year &operator++ ();
int isNull();
};
Year operator+ (Year y, int n);
Year operator- (Year y, int n);
// These will barf if either year is NULL.
int operator < (Year y1, Year y2);
int operator > (Year y1, Year y2);
int operator >= (Year y1, Year y2);
int operator <= (Year y1, Year y2);
// This allows nulls to equal nulls, and nothing else.
int operator == (Year y1, Year y2);
int operator != (Year y1, Year y2);
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