25 Time library [time]

25.8 The civil calendar [time.cal]

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

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

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

Effects: os << wdi.weekday() << '[' << wdi.index().

If wdi.index() is in the range [1, 5], appends with ']', otherwise appends with " is not a valid index]".

Returns: os.