Web Reference: I am a C guy and I'm trying to understand some C++ code. I have the following function declaration: A fine question, but a little too broad (IMO). That's called the scope-resolution operator, and your search term for further learning is scope. All those names (cout, member functions of A) are defined in scopes and you have to resolve the scope (that is, tell the compiler where to look) with ::. 95 .cpp is the recommended extension for C++ as far as I know. Some people even recommend using .hpp for C++ headers, just to differentiate from C. Although the compiler doesn't care what you do, it's personal preference.
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