Constructor
<mp-units/framework/quantity.h>
template<
    typename FwdValue,
    Reference R2>
requires (equivalent(unit, get_unit(R2{}))) && detail::ValuePreservingConstruction<rep, FwdValue>
constexpr
quantity(
    FwdValue&& val,
    R2);
| Name | Description | 
|---|---|
| val | The object to move construct from |