27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.8 Class weekday_­last [time.cal.wdlast]

27.8.8.1 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; }; }
weekday_­last represents the last weekday of a month.
[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]
weekday_­last is a trivially copyable and standard-layout class type.

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

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

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

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