27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.11 Class month_­weekday [time.cal.mwd]

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

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