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

duration (C++11)
time_point (C++11)

clock_time_conversion (C++20)
clock_cast (C++20)

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

比较二个 std::chrono::year x 与 y 。

1) int(x) == int(y)

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

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