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 <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

See also¶

operator+= adds or subtracts a number of days
operator-= (public member function)
operator+ performs arithmetic on weekdays
operator- (function)
(C++20)