27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.7 Class weekday_­indexed [time.cal.wdidx]

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

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