std::chrono::weekday::operator++, std::chrono::weekday::operator--

Since C++20

Adds or subtracts 1 from the weekday value, reducing the result modulo 7 to an integer in the range [0,6].

# Declarations

constexpr std::chrono::weekday& operator++() noexcept;

(since C++20)

constexpr std::chrono::weekday operator++( int ) noexcept;

(since C++20)

constexpr std::chrono::weekday& operator--() noexcept;

(since C++20)

constexpr std::chrono::weekday operator--( int ) noexcept;

(since C++20)

# Notes

After a call to one of these functions, ok() is always true.

# Example

#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());
}

# See also