30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.15 Class year_month_day_last [time.cal.ymdlast]

30.8.15.2 Member functions [time.cal.ymdlast.members]

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constexpr year_month_day_last(const chrono::year& y, const chrono::month_day_last& mdl) noexcept;
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Effects: Initializes y_ with y and mdl_ with mdl.
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constexpr year_month_day_last& operator+=(const months& m) 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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Effects: *this = *this + m.
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Returns: *this.
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constexpr year_month_day_last& operator-=(const months& m) 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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Effects: *this = *this - m.
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Returns: *this.
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constexpr year_month_day_last& operator+=(const years& y) noexcept;
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Effects: *this = *this + y.
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Returns: *this.
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constexpr year_month_day_last& operator-=(const years& y) noexcept;
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Effects: *this = *this - y.
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Returns: *this.
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constexpr chrono::year year() const noexcept;
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Returns: y_.
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constexpr chrono::month month() const noexcept;
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Returns: mdl_.month().
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constexpr chrono::month_day_last month_day_last() const noexcept;
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Returns: mdl_.
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constexpr chrono::day day() const noexcept;
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Returns: If ok() is true, returns a day representing the last day of the (year, month) pair represented by *this.
Otherwise, the returned value is unspecified.
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[Note 1: 
This value might be computed on demand.
— end note]
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constexpr operator sys_days() const noexcept;
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Returns: sys_days{year()/month()/day()}.
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constexpr explicit operator local_days() const noexcept;
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Returns: local_days{sys_days{*this}.time_since_epoch()}.
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constexpr bool ok() const noexcept;
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Returns: y_.ok() && mdl_.ok().