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7
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CPPTIME.H
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1995-02-23
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// File from page 315 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: CPPTIME.H -- A simple time class
#ifndef CPPTIME_H_
#define CPPTIME_H_
#include <time.h>
#include <string.h>
class Time {
time_t T;
tm local;
char Ascii[26];
unsigned char lflag, aflag;
void updateLocal() {
if(!lflag) {
local = *localtime(&T);
lflag++;
}
}
void updateAscii() {
if(!aflag) {
updateLocal();
strcpy(Ascii, asctime(&local));
aflag++;
}
}
public:
Time() { mark(); }
void mark() {
lflag = aflag = 0;
time(&T);
}
const char* ascii() {
updateAscii();
return Ascii;
}
// Difference in seconds:
int delta(Time* dt) const {
return difftime(T, dt->T);
}
int DaylightSavings() {
updateLocal();
return local.tm_isdst;
}
int DayOfYear() { // Since January 1
updateLocal();
return local.tm_yday;
}
int DayOfWeek() { // Since Sunday
updateLocal();
return local.tm_wday;
}
int Since1900() { // Years since 1900
updateLocal();
return local.tm_year;
}
int Month() { // Since January
updateLocal();
return local.tm_mon;
}
int DayOfMonth() {
updateLocal();
return local.tm_mday;
}
int Hour() { // Since midight, 24-hour clock
updateLocal();
return local.tm_hour;
}
int Minute() {
updateLocal();
return local.tm_min;
}
int Second() {
updateLocal();
return local.tm_sec;
}
};
#endif // CPPTIME_H_