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// $Id: Year.cc,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.
*/
#include "common.hh"
Year::Year () {
value = 0;
}
Year::Year (unsigned year) {
// If they tried to specify a negative year it would show up as a big
// positive number, so don't confuse them with details.
if (year < 1 || year > 4000)
barf (YEAR_OUT_OF_RANGE);
value = year;
}
unsigned
Year::val () {
if (value == 0)
barf (NULL_YEAR);
return value;
}
Year operator+ (Year y, int n) {
return Year (y.val() + n);
}
Year operator- (Year y, int n) {
return Year (y.val() - n);
}
int operator < (Year y1, Year y2) {
if (y1.val() < y2.val())
return 1;
return 0;
}
int operator > (Year y1, Year y2) {
if (y1.val() > y2.val())
return 1;
return 0;
}
int operator >= (Year y1, Year y2) {
if (y1.val() >= y2.val())
return 1;
return 0;
}
int operator <= (Year y1, Year y2) {
if (y1.val() <= y2.val())
return 1;
return 0;
}
int operator == (Year y1, Year y2) {
if (y1.value == y2.value)
return 1;
return 0;
}
int operator != (Year y1, Year y2) {
return (!(y1 == y2));
}
//Year &Year::operator++ () {
// (*this) = Year (value+1); // Use integrity checks in constructor
// return (*this);
//}
int Year::isNull() {
if (!value)
return 1;
return 0;
}
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