table of contents
std::chrono::weekday::operator++,std::chrono::weekday::operator--(3) | C++ Standard Libary | std::chrono::weekday::operator++,std::chrono::weekday::operator--(3) |
NAME¶
std::chrono::weekday::operator++,std::chrono::weekday::operator-- - std::chrono::weekday::operator++,std::chrono::weekday::operator--
Synopsis¶
constexpr std::chrono::weekday& operator++() noexcept;
(1) (since C++20)
constexpr std::chrono::weekday operator++(int) noexcept; (2) (since
C++20)
constexpr std::chrono::weekday& operator--() noexcept; (3)
(since C++20)
constexpr std::chrono::weekday operator--(int) noexcept; (4) (since
C++20)
Adds or subtracts 1 from the weekday value, reducing the result modulo 7 to
an
integer in the range [0, 6].
1-2) Performs *this += std::chrono::days{1};
3-4) Performs *this -= std::chrono::days{1};
Parameters¶
(none)
Return value¶
1,3) a reference to this weekday after modification
2,4) a copy of the weekday made before modification
Notes¶
After a call to one of these functions, ok() is always true.
Example¶
// Run this code
#include <iostream>
#include <chrono>
int main()
{
std::cout << std::boolalpha;
std::chrono::weekday wd {0}; // Sunday is 0 or 7
--wd;
std::cout << (wd == std::chrono::Saturday) << ' ';
++wd;
std::cout << (wd == std::chrono::Sunday) << '\n';
}
Output:¶
true true
See also¶
operator+= adds or subtracts a number of days
operator-= (public member function)
operator+ performs arithmetic on weekdays
operator- (function)
(C++20)
2022.07.31 | http://cppreference.com |