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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../chrono/year/operator_sign.html below:

std::chrono::year::operator+, std::chrono::year::operator- - cppreference.com

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C-style date and time [edit] std::chrono::year Member functions year::year year::operator++year::operator-- year::operator+=year::operator-=

year::operator+year::operator-

year::is_leap year::operator int year::ok year::min year::max Nonmember functions operator==operator<=> operator+operator- operator<< from_stream operator""y Helper classes formatter<std::chrono::year> hash<std::chrono::year>

(C++26)

[edit] constexpr std::chrono::year operator+() noexcept; (1) (since C++20) constexpr std::chrono::year operator-() noexcept; (2) (since C++20)

Applies the unary operators to the year value.

1) Returns a copy of *this.

2) Returns a year whose year value is the negation of that of *this.

[edit] Return value

1) *this

2) std::chrono::year(-int(*this)) [edit] Example

Run this code

#include <chrono>
#include <iostream>
 
int main()
{
    constexpr std::chrono::year y{2020};
    constexpr auto ny = -y;
    std::cout << "The year " << (int)y << " negated is " << (int)ny << '\n';
}

Output:

The year 2020 negated is -2020

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