IIRC C++ does not allow methods to be passed as function pointers. if b () were outside a class (a global function) it could be passed safely. Static methods might also be callable, but I'm not sure.

You can't forward-declare a nested class, because at the point of declaration the compiler doesn't know whether the inner class is public/protected/private in the outer class.

Write a complete C++ class to represent a circle in two-dimensional space. Your class should consist of a header (circle.h) and an implementation (circle.cpp) file as described below. The circle class ...

C++ can do that, but it also supports high-level features such as classes and object orientation, which allows programmers to create “objects” containing data and functions.

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