73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
// Fig. 9.24: Date.cpp
|
|
// Date class member-function definitions.
|
|
#include <array>
|
|
#include <fmt/format.h>
|
|
#include <iostream>
|
|
#include <stdexcept>
|
|
#include "Date.h" // include Date class definition
|
|
|
|
// constructor confirms proper value for month; calls
|
|
// utility function checkDay to confirm proper value for day
|
|
Date::Date(int year, int month, int day)
|
|
: m_year{year}, m_month{month}, m_day{day} {
|
|
if (m_month < 1 || m_month > monthsPerYear) { // validate the month
|
|
throw std::invalid_argument{"month must be 1-12"};
|
|
}
|
|
|
|
if (!checkDay(day)) { // validate the day
|
|
throw std::invalid_argument{
|
|
"Invalid day for current month and year"};
|
|
}
|
|
|
|
// output Date object to show when its constructor is called
|
|
std::cout << fmt::format("Date object constructor: {}\n", toString());
|
|
}
|
|
|
|
// gets string representation of a Date in the form yyyy-mm-dd
|
|
std::string Date::toString() const {
|
|
return fmt::format("{}-{:02d}-{:02d}", m_year, m_month, m_day);
|
|
}
|
|
|
|
// output Date object to show when its destructor is called
|
|
Date::~Date() {
|
|
std::cout << fmt::format("Date object destructor: {}\n", toString());
|
|
}
|
|
|
|
// utility function to confirm proper day value based on
|
|
// month and year; handles leap years, too
|
|
bool Date::checkDay(int day) const {
|
|
// we ignore element 0
|
|
static const std::array daysPerMonth{
|
|
0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
|
|
|
|
// determine whether testDay is valid for specified month
|
|
if (1 <= day && day <= daysPerMonth.at(m_month)) {
|
|
return true;
|
|
}
|
|
|
|
// February 29 check for leap year
|
|
if (m_month == 2 && day == 29 && (m_year % 400 == 0 ||
|
|
(m_year % 4 == 0 && m_year % 100 != 0))) {
|
|
return true;
|
|
}
|
|
|
|
return false; // invalid day, based on current m_month and m_year
|
|
}
|
|
|
|
|
|
|
|
/**************************************************************************
|
|
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
|
|
* Pearson Education, Inc. All Rights Reserved. *
|
|
* *
|
|
* DISCLAIMER: The authors and publisher of this book have used their *
|
|
* best efforts in preparing the book. These efforts include the *
|
|
* development, research, and testing of the theories and programs *
|
|
* to determine their effectiveness. The authors and publisher make *
|
|
* no warranty of any kind, expressed or implied, with regard to these *
|
|
* programs or to the documentation contained in these books. The authors *
|
|
* and publisher shall not be liable in any event for incidental or *
|
|
* consequential damages in connection with, or arising out of, the *
|
|
* furnishing, performance, or use of these programs. *
|
|
**************************************************************************/
|