Should I become proficient with STL libraries before learning BOOST alternatives?

Question

Does it make sense to restrict yourself to the STL libraries when learning C++ and then tackle boost and its additions after you have become fairly proficient with vanilla C++?

Or should you dive right into BOOST while learning C++?

Answer 1

The STL has some core concepts to it. Boost builds on and expands on them. If you understand them, then moving right on to Boost may be of use to you. If not, I would start with the STL.

• The distinction between the various container types (sequences like vector, list and deque, and associations like map, set and their multi* and unordered_* varieties). Sometimes you can swap one for the other -- sometimes you can't. Know their strengths and their limits.
• The role of iterators, and how they provide a bridge between containers and algorithms. (This one I find I use over and over).
• Why there are standard algorithms: they are often tiny amounts of code, so it may not be obvious why they exist. Learn which containers they work with, and how to specialize them for particular cases (for example see how generic copy differs from copy specialized for const char *).
• How and when traits classes are used.
• How to use binders (bind1st, ptr_fun and mem_fun): the syntax can obscure their utility.
• How to use string -- and when not to use it. (All string classes have tradeoffs: learning the pros and cons of the standard one is educational).
• The difference between streams and streambufs: how to use the former to do formatted I/O (try reading a string from a stream: it's not as straightforward as it should be), and the latter to do low-level fast I/O.

The principles used to design the STL are built upon and expanded on by the Boost libraries. If you get them, Boost is manageable. If you don't, and Boost ends up hard to follow, you can go back to the STL to get your bearings.

(In general Boost really pushes the boundaries of the language. If you decide you want to really push your own knowledge of C++, and test if you really know what you think you know then it can provide an interesting challenge. I've used C++ for more than a dozen years, have taught other people how to use it, have acquired proficiency in many more high-level languages since then and Boost still surprises me. It's very useful, but its not trivial).

Answer 2

I'd suggest getting a clear handle on STL, before looking at Boost. Boost is meant to build on top of STL and many of the libraries are slated to become part of the standard library eventually. Boost libraries are generally less mature and less standard than STL. Also, many boost libraries go too far, in my opinion, adding "features" that don't natively exist in C++ (leading to really insane syntax). In many cases there are more sane C++ idioms available for solving most programming problems without using these arcane Boost libraries.