C99 has single line // comments. It also has the restrict tag.
About the idea of C++ as a better C, See "C++ - The Forgotten Trojan Horse". (http://ejohnson.blogs.com/software/2004/11/i_find_c_intere.h...)
If you're using C++ for the STL, keep in mind that the ML languages (OCaml, SML) also have compile-time parametric data structures, and they infer and check their usage for you.
They also have a proper module system, so when you change a private variable, you don't have to choose between linking errors or recompiling damn near every piece of C++ code in your source tree.
They're also pretty fast.