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std::chrono::operator==,<=>(std::chrono::year)

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

Compare the two std::chrono::year x and y.

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

Return value

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

Example

#include <chrono>
#include <iostream>
 
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));
}

Output:

true

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