C++ is a difficult language to master. Very difficult. It does not take more than a few days away from the keyboard before you start forgetting some of the details that will bite when you visit the dark and dusty corners of the language (sometimes because you work with code written by others).
Last month, Anders Schau Knatten officially launched a great tool for practicing your C++ language skills:
I recommend that you visit this site once in a while to challenge yourself. A good score on this quiz does not make you a great programmer, but it does suggest that you have a deeper understanding of the language than most. Being fluent in a programming language makes it much easier to avoid the dark and dusty corners so that you can concentrate on writing high quality software instead of spending time in the debugger.