27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.7 Class weekday_­indexed [time.cal.wdidx]

27.8.7.1 Overview [time.cal.wdidx.overview]

namespace std::chrono { class weekday_indexed { chrono::weekday wd_; // exposition only unsigned char index_; // exposition only public: weekday_indexed() = default; constexpr weekday_indexed(const chrono::weekday& wd, unsigned index) noexcept; constexpr chrono::weekday weekday() const noexcept; constexpr unsigned index() const noexcept; constexpr bool ok() const noexcept; }; }
1
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weekday_­indexed represents a weekday and a small index in the range 1 to 5.
This class is used to represent the first, second, third, fourth, or fifth weekday of a month.
2
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[Note 1:
A weekday_­indexed object can be constructed by indexing a weekday with an unsigned.
— end note]
[Example 1: constexpr auto wdi = Sunday[2]; // wdi is the second Sunday of an as yet unspecified month static_assert(wdi.weekday() == Sunday); static_assert(wdi.index() == 2); — end example]
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weekday_­indexed is a trivially copyable and standard-layout class type.