29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.7 Class weekday_indexed [time.cal.wdidx]

29.8.7.2 Member functions [time.cal.wdidx.members]

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constexpr weekday_indexed(const chrono::weekday& wd, unsigned index) noexcept;
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Effects: Initializes wd_ with wd and index_ with index.
The values held are unspecified if !wd.ok() or index is not in the range [0, 7].
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constexpr chrono::weekday weekday() const noexcept;
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Returns: wd_.
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constexpr unsigned index() const noexcept;
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Returns: index_.
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constexpr bool ok() const noexcept;
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Returns: wd_.ok() && 1 <= index_ && index_ <= 5.