29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.8 Class weekday_last [time.cal.wdlast]

29.8.8.1 Overview [time.cal.wdlast.overview]

namespace std::chrono { class weekday_last { chrono::weekday wd_; // exposition only public: constexpr explicit weekday_last(const chrono::weekday& wd) noexcept; constexpr chrono::weekday weekday() const noexcept; constexpr bool ok() const noexcept; }; }
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weekday_last represents the last weekday of a month.
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[Note 1: 
A weekday_last object can be constructed by indexing a weekday with last.
— end note]
[Example 1: constexpr auto wdl = Sunday[last]; // wdl is the last Sunday of an as yet unspecified month static_assert(wdl.weekday() == Sunday); — end example]
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weekday_last is a trivially copyable and standard-layout class type.

29.8.8.2 Member functions [time.cal.wdlast.members]

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constexpr explicit weekday_last(const chrono::weekday& wd) noexcept;
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Effects: Initializes wd_ with wd.
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constexpr chrono::weekday weekday() const noexcept;
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Returns: wd_.
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constexpr bool ok() const noexcept;
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Returns: wd_.ok().

29.8.8.3 Non-member functions [time.cal.wdlast.nonmembers]

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constexpr bool operator==(const weekday_last& x, const weekday_last& y) noexcept;
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Returns: x.weekday() == y.weekday().
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template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const weekday_last& wdl);
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Effects: Equivalent to: return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{:L}[last]"), wdl.weekday());