23 General utilities library [utilities]

23.17 Time utilities [time]

23.17.5 Class template duration [time.duration]

23.17.5.3 duration arithmetic [time.duration.arithmetic]

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constexpr common_type_t<duration> operator+() const;
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Returns: common_­type_­t<duration>(*this).
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constexpr common_type_t<duration> operator-() const;
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Returns: common_­type_­t<duration>(-rep_­).
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constexpr duration& operator++();
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Effects: As if by ++rep_­.
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Returns: *this.
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constexpr duration operator++(int);
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Returns: duration(rep_­++).
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constexpr duration& operator--();
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Effects: As if by --rep_­.
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Returns: *this.
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constexpr duration operator--(int);
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Returns: duration(rep_­--).
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constexpr duration& operator+=(const duration& d);
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Effects: As if by: rep_­ += d.count();
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Returns: *this.
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constexpr duration& operator-=(const duration& d);
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Effects: As if by: rep_­ -= d.count();
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Returns: *this.
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constexpr duration& operator*=(const rep& rhs);
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Effects: As if by: rep_­ *= rhs;
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Returns: *this.
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constexpr duration& operator/=(const rep& rhs);
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Effects: As if by: rep_­ /= rhs;
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Returns: *this.
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constexpr duration& operator%=(const rep& rhs);
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Effects: As if by: rep_­ %= rhs;
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Returns: *this.
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constexpr duration& operator%=(const duration& rhs);
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Effects: As if by: rep_­ %= rhs.count();
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Returns: *this.