[Boost-users] ptr_set

Hello all, I'm trying to use ptr_set with my class Hierarchy. Base is an abstract base class with a bunch of pure virtual functions. I've some derived classes with those virtual functions defined in them. I'm using this Base class hierarchy in another class (say Other). So I've declared a member variable of Other as ptr_set<Base> m_items ; this works fine on linux with gcc-4.2 but with VS2005, I'm getting a compilation error, saying that It cannot instantiate base class as it is having pure virtual functions. Am I doing some thing wrong here ? Surya