27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.17 Class year_­month_­weekday_­last [time.cal.ymwdlast]

27.8.17.3 Non-member functions [time.cal.ymwdlast.nonmembers]

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constexpr bool operator==(const year_month_weekday_last& x, const year_month_weekday_last& y) noexcept;
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Returns: x.year() == y.year() && x.month() == y.month() && x.weekday_last() == y.weekday_last()
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constexpr year_month_weekday_last operator+(const year_month_weekday_last& ymwdl, const months& dm) noexcept;
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Constraints: If the argument supplied by the caller for the months parameter is convertible to years, its implicit conversion sequence to years is worse than its implicit conversion sequence to months ([over.ics.rank]).
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Returns: (ymwdl.year() / ymwdl.month() + dm) / ymwdl.weekday_­last().
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constexpr year_month_weekday_last operator+(const months& dm, const year_month_weekday_last& ymwdl) noexcept;
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Constraints: If the argument supplied by the caller for the months parameter is convertible to years, its implicit conversion sequence to years is worse than its implicit conversion sequence to months ([over.ics.rank]).
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Returns: ymwdl + dm.
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constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const months& dm) noexcept;
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Constraints: If the argument supplied by the caller for the months parameter is convertible to years, its implicit conversion sequence to years is worse than its implicit conversion sequence to months ([over.ics.rank]).
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Returns: ymwdl + (-dm).
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constexpr year_month_weekday_last operator+(const year_month_weekday_last& ymwdl, const years& dy) noexcept;
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Returns: {ymwdl.year()+dy, ymwdl.month(), ymwdl.weekday_­last()}.
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constexpr year_month_weekday_last operator+(const years& dy, const year_month_weekday_last& ymwdl) noexcept;
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Returns: ymwdl + dy.
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constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const years& dy) noexcept;
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Returns: ymwdl + (-dy).
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template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const year_month_weekday_last& ymwdl);
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Effects: Equivalent to: return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{}/{}/{}"), ymwdl.year(), ymwdl.month(), ymwdl.weekday_last());