5 Quantities and units library [quantities]

5.6 Quantity [qty]

5.6.14 Construction helper delta [qty.delta]

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namespace mp_units { template<Reference R> struct delta_ { template<typename FwdRep, RepresentationOf<get_quantity_spec(R{})> Rep = std::remove_cvref_t<FwdRep>> constexpr quantity<R{}, Rep> operator()(FwdRep&& lhs) const; }; }
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template<typename FwdRep, RepresentationOf<get_quantity_spec(R{})> Rep = std::remove_cvref_t<FwdRep>> constexpr quantity<R{}, Rep> operator()(FwdRep&& lhs) const;
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Effects: Equivalent to: return quantity{std​::​forward<FwdRep>(lhs), R{}};