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std::chrono::weekday_indexed::ok

From cppreference.com
 
 
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C-style date and time
 
 
constexpr bool ok() const noexcept;
(since C++20)

Checks if the weekday object and the index stored in *this are both valid.

[edit] Return value

true if weekday().ok() == true and index() is in the range [1, 5]. Otherwise false.