25 Time library [time]

25.8 The civil calendar [time.cal]

25.8.17 Class year_­month_­weekday_­last [time.cal.ymwdlast]

25.8.17.3 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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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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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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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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Returns: os << ymwdl.year() << '/' << ymwdl.month() << '/' << ymwdl.weekday_­last().