27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.11 Class month_­weekday [time.cal.mwd]

27.8.11.1 Overview [time.cal.mwd.overview]

namespace std::chrono { class month_weekday { chrono::month m_; // exposition only chrono::weekday_indexed wdi_; // exposition only public: constexpr month_weekday(const chrono::month& m, const chrono::weekday_indexed& wdi) noexcept; constexpr chrono::month month() const noexcept; constexpr chrono::weekday_indexed weekday_indexed() const noexcept; constexpr bool ok() const noexcept; }; }
month_­weekday represents the weekday of a month, of an as yet unspecified year.
To do this the month_­weekday stores a month and a weekday_­indexed.
[Example 1: constexpr auto mwd = February/Tuesday[3]; // mwd is the third Tuesday of February of an as yet unspecified year static_assert(mwd.month() == February); static_assert(mwd.weekday_indexed() == Tuesday[3]); — end example]
month_­weekday is a trivially copyable and standard-layout class type.

27.8.11.2 Member functions [time.cal.mwd.members]

constexpr month_weekday(const chrono::month& m, const chrono::weekday_indexed& wdi) noexcept;
Effects: Initializes m_­ with m, and wdi_­ with wdi.
constexpr chrono::month month() const noexcept;
Returns: m_­.
constexpr chrono::weekday_indexed weekday_indexed() const noexcept;
Returns: wdi_­.
constexpr bool ok() const noexcept;
Returns: m_­.ok() && wdi_­.ok().

27.8.11.3 Non-member functions [time.cal.mwd.nonmembers]

constexpr bool operator==(const month_weekday& x, const month_weekday& y) noexcept;
Returns: x.month() == y.month() && x.weekday_­indexed() == y.weekday_­indexed().
template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const month_weekday& mwd);
Effects: Equivalent to: return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{:L}/{:L}"), mwd.month(), mwd.weekday_indexed());