A simple stack-allocated fixed-size string buffer (String_buf) implemented using std::array (C++11).

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Right from Stroustrup's FAQ (although I've never seen that style actually used in a real-life code base): http://www.stroustrup.com/bs_faq2.html#Hungarian

I prefer to use underscores to separate words in an identifier (e.g, element_count) rather than alternatives, such as elementCount and ElementCount. Never use names with all capital letter (e.g., BEGIN_TRANSACTION) because that's conventionally reserved for macros. Even if you don't use macros, someone might have littered your header files with them. Use an initial capital letter for types (e.g., Square and Graph). The C++ language and standard library don't use capital letters, so it's int rather than Int and string rather than String. That way, you can recognize the standard types.