[Boost-users] How to use boost's shared_ptr.hpp?

Hi, I am tying use boost's shared_ptr.hpp, but it gives me the following compile errors: /usr/include/boost/detail/sp_counted_impl.hpp: In member function 'virtual void* boost::detail::sp_counted_impl_pd::get_deleter(const std::type_info&)': /usr/include/boost/detail/sp_counted_impl.hpp:150: error: cannot use typeid with -fno-rtti /usr/include/boost/detail/sp_counted_impl.hpp: In member function 'virtual void* boost::detail::sp_counted_impl_pda::get_deleter(const std::type_info&)': /usr/include/boost/detail/sp_counted_impl.hpp:220: error: cannot use typeid with -fno-rtti I have these in my .h file: using namespace boost; class Rect; typedef shared_ptr<Rect> RectPtr; My question is why I need to enable 'rtti' in order to use boost shared_ptr ? And if there is any other smart pointer library which does not require me to enable rtti ? Thank you.