std::chrono::operator ==,!= (std::chrono::weekday_indexed)

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constexpr bool operator==(const std::chrono::weekday_indexed& x,
                          const std::chrono::weekday_indexed& y) noexcept;
(C++20 起)
constexpr bool operator!=(const std::chrono::weekday_indexed& x,
                          const std::chrono::weekday_indexed& y) noexcept;
(C++20 起)

比较二个 weekday_indexed xy

[编辑] 返回值

1) x.weekday() == y.weekday() && x.index() == y.index()
2) !(x == y)