[Boost-users] Does Boost have polymorphic functors as named-operators?

Hi all, Is there something like -- functional::identity, functional::plus (not std::plus<T>), functional::assign...etc -- in Boost? I know I can use Phoenix _1, _1 + _2, _1 = _2..., but I'd expect something more basic. Sometimes I just need something like that but not willing to have all the ET things... Maybe they're just provided within Phoenix or Proto? Thanks for any help.