Method swap

include/chaiscript/dispatchkit/boxed_value.hpp:211–214

      Boxed_Value& operator=(const Boxed_Value&) = default;

      void swap(Boxed_Value &rhs)
      {
        std::swap(m_data, rhs.m_data);
      }

      /// Copy the values stored in rhs.m_data to m_data.
      /// m_data pointers are not shared in this case