30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.7 Class weekday_indexed [time.cal.wdidx]

30.8.7.3 Non-member functions [time.cal.wdidx.nonmembers]

constexpr bool operator==(const weekday_indexed& x, const weekday_indexed& y) noexcept;

Returns: x.weekday() == y.weekday() && x.index() == y.index().

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const weekday_indexed& wdi);

Effects: Equivalent to: auto i = wdi.index(); return os << (i >= 1 && i <= 5 ? format(os.getloc(), STATICALLY-WIDEN<charT>("{:L}[{}]"), wdi.weekday(), i) : format(os.getloc(), STATICALLY-WIDEN<charT>("{:L}[{} is not a valid index]"), wdi.weekday(), i));