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