date.h

著名的uncle Bob的Agile software development的代码

// Copyright (C) 1995 by R. C. M. Consulting Inc
// All Rights Reserved.

#ifndef COMPONENTS_DATE_H
#define COMPONENTS_DATE_H

#include <time.h> 	/* unix and borland compatible. */
#include <string>
class ostream;
class istream;

class Date
{
 public:
  enum DayOfWeek {sunday=0, monday, tuesday, wednesday,
		  thursday, friday, saturday};
  // Canonical Form
  Date();
  Date(int month, int day, int year);
  Date(const Date&);
  virtual ~Date();
  Date& operator= (const Date&);
    
  // Accessors
  int GetMonth() const;
  int GetDay() const;
  int GetYear() const;
  DayOfWeek GetDayOfWeek() const;
  string GetDayOfWeekName() const;
    
  // Input & Output
  friend ostream& operator<< (ostream&, const Date&);
  friend istream& operator>> (istream&, Date&);
    
  // Arithmetic and comparison operators
  int         operator== (const Date&) const;
  int         operator!= (const Date&) const;
  int         operator<  (const Date&) const;
  int         operator>  (const Date&) const;
  int         operator<= (const Date&) const;
  int         operator>= (const Date&) const;
  friend Date operator+  (int, const Date&);
  friend Date operator+  (const Date&, int);
  Date        operator-  (int) const;
  int         operator-  (const Date&) const;
  Date&       operator+= (int);
  Date&       operator-= (int);
  Date&       operator++ ();
  Date        operator++ (int);  // postfix
  Date&       operator-- ();
  Date        operator-- (int);  // postfix

  static bool IsBetween(const Date& theDate, const Date& startDate, const Date& endDate)
  {
    return (theDate >= startDate) && (theDate <= endDate);
  }
    
 private:
  time_t      itsTime;
  tm          itsTimeStruct;
    
  static long secondsPerDay;
};

#endif