[Boost-users] shared_ptr and std::set::erase

Hello, I have: std::set< boost::shared_ptr< A > > m_set; and when I try to do: m_set.erase( somesharedptr ); the shared_ptr is not removed from the set. There is already a shared_ptr object pointing to the same A object inside the set. I think it's because the definition of "shared_ptr<>::operator<" and its use in std::set<>::erase. What's the correct way of using a shared_ptr inside a set? Thanks.