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;
  };
}
1
#
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.
2
#
[Example
: 
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
]
3
#
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;
1
#
Effects: Initializes m_­ with m, and wdi_­ with wdi.
🔗
constexpr chrono::month month() const noexcept;
2
#
Returns: m_­.
🔗
constexpr chrono::weekday_indexed weekday_indexed() const noexcept;
3
#
Returns: wdi_­.
🔗
constexpr bool ok() const noexcept;
4
#
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;
1
#
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);
2
#
Effects: Equivalent to: 
return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{}/{}"),
                    mwd.month(), mwd.weekday_indexed());