30 Time library [time]

30.5 Class template duration [time.duration]

30.5.6 Non-member arithmetic [time.duration.nonmember]

1
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In the function descriptions that follow, unless stated otherwise, let CD represent the return type of the function.
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template<class Rep1, class Period1, class Rep2, class Period2> constexpr common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>> operator+(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
2
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Returns: CD(CD(lhs).count() + CD(rhs).count()).
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template<class Rep1, class Period1, class Rep2, class Period2> constexpr common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>> operator-(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
3
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Returns: CD(CD(lhs).count() - CD(rhs).count()).
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template<class Rep1, class Period, class Rep2> constexpr duration<common_type_t<Rep1, Rep2>, Period> operator*(const duration<Rep1, Period>& d, const Rep2& s);
4
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Constraints: is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true.
5
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Returns: CD(CD(d).count() * s).
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template<class Rep1, class Rep2, class Period> constexpr duration<common_type_t<Rep1, Rep2>, Period> operator*(const Rep1& s, const duration<Rep2, Period>& d);
6
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Constraints: is_convertible_v<const Rep1&, common_type_t<Rep1, Rep2>> is true.
7
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Returns: d * s.
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template<class Rep1, class Period, class Rep2> constexpr duration<common_type_t<Rep1, Rep2>, Period> operator/(const duration<Rep1, Period>& d, const Rep2& s);
8
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Constraints: is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true and Rep2 is not a specialization of duration.
9
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Returns: CD(CD(d).count() / s).
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template<class Rep1, class Period1, class Rep2, class Period2> constexpr common_type_t<Rep1, Rep2> operator/(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
10
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Let CD be common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>.
11
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Returns: CD(lhs).count() / CD(rhs).count().
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template<class Rep1, class Period, class Rep2> constexpr duration<common_type_t<Rep1, Rep2>, Period> operator%(const duration<Rep1, Period>& d, const Rep2& s);
12
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Constraints: is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true and Rep2 is not a specialization of duration.
13
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Returns: CD(CD(d).count() % s).
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template<class Rep1, class Period1, class Rep2, class Period2> constexpr common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>> operator%(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
14
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Returns: CD(CD(lhs).count() % CD(rhs).count()).