template struct Poco::Util::Units::Units::Prefix::Holder

template <typename U>
struct Holder: public Poco::Util::Units::Units::Prefix::Placeholder
{
    // typedefs

    typedef Value<typename U::ValueType, typename U::Unit> ValueType;

    // fields

    ValueType _val;

    // construction

    Holder(const U& val);

    // methods

    double
    get() const;

    void
    appendUnit(std::ostream& os) const;
};