There are a lot of reference material for C++.
From the webz:
- C++ FAQ Lite.
- SGI STL's docs are great (Note that some of the documentation are items that exist in SGI's implementation, but may not be available in other STL libraries).
Really there are 4 books that I believe every C++ developer should have access to:
- Effective C++ by Scott Meyers
- More Effective C++ by Scott Meyers
- The C++ Programming Language by Bjarne Stroustrap
- Effective STL by Scott Meyers
You get extra credit for owning:
- Design Patterns: Elements of Reusable Object-Oriented Software (for learning patterns, not for curing insomnia)
- The Art of Computing by Donald Knuth
There are many other excellent books for C++, but these are the ones I highly recommend.