std::chrono::weekday::operator++, std::chrono::weekday::operator--
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std::chrono::weekday
Member functions
weekday::operator++weekday::operator--
Nonmember functions
Helper classes
(C++26)
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};.
Contents
[edit] Parameters
(none)
[edit] Return value
1,3) A reference to this
weekday after modification.2,4) A copy of the
weekday made before modification.[edit] Notes
After a call to one of these functions, ok() is always true.
[edit] Example
Run this code
#include <cassert> #include <chrono> #include <iostream> 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'; wd = std::chrono::weekday {13}; assert (!wd.ok()); wd++; assert (wd.ok()); }
Output:
true true