class DiscEntry : public InvEntry
{
public:
    DiscEntry(InvEntry* inv) : InvEntry(*inv->item)
    {
    }
    virtual std::string get_text() const
    {
        return std::string(" ") + item->name(DESC_PLAIN);
    }
};

    MenuEntry *newme = new MenuEntry;
    newme->text = std::string(" ") + ie->item->name(DESC_PLAIN);
    newme->quantity = 0;

    DiscEntry *newme = new DiscEntry(ie);