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std::chrono::operator==,<=>(std::chrono::year) cppreference.com
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std::chrono::operator==,<=>(std::chrono::year)

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std::chrono::year
 
<tbody> </tbody>
constexpr bool operator==( const std::chrono::year& x, const std::chrono::year& y ) noexcept;
 (1) ( C++20)
constexpr std::strong_ordering operator<=>( const std::chrono::year& x, const std::chrono::year& y ) noexcept;
 (2) ( C++20)

std::chrono::year x y.

<, <=, >, >= != operator<=> operator== .

1) int(x) == int(y)
2) int(x) <=> int(y)

#include <iostream>
#include <chrono>

int main()
{
    using namespace std::chrono;

    constexpr year y1{2020};
    constexpr year y2{2021};

    std::cout << std::boolalpha << (y1 != y2) << '\n';

    static_assert(
        (2020y < 2023y) && (2020y == 2020y) && (2020y <= 2023y) &&
        (2023y > 2020y) && (2023y != 2020y) && (2023y >= 2020y)
    );
}

: 

true
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