[Boost-users] strange linker error with boost::function

Can anyone think why I would get an unresolved symbol on this monstrosity from the liker: public: __thiscall boost::function< class std::auto_ptr<struct esi::command::command> __cdecl(class std::vector< struct esi::draw::primitives::point_impl<double> ,class std::allocator > const & )

::function < class std::auto_ptr<struct esi::command::command> __cdecl(class std::vector< struct esi::draw::primitives::point_impl<double> ,class std::allocator > const & )

< class std::auto_ptr<struct esi::command::command> (__cdecl*)(class std::vector< struct esi::draw::primitives::point_impl<double> ,class std::allocator > const & )

(class std::auto_ptr<struct esi::command::command> (__cdecl*)(class std::vector< struct esi::draw::primitives::point_impl<double> ,class std::allocator > const & ) ,int ) I tried to clean it up a bit. Looks to me like there's no instantiation of the appropriate constructor to the function template. I tried to recreate the problem in a simple sample but can't seem to do it. Hoping that I'm falling foul of a common issue that someone might be able to just give me pointers toward fixing.