In C++, ensure that nonstatic member functions take three or fewer arguments because of the implicit this pointer argument that is usually passed in R0.
In the clone() member function, the new Circle(*this) code calls Circle's copy constructor to copy the state of this into the newly created Circle object.
同一作用域中,多个函数可有相同名称,只要其形参列表,以及对于成员函数的cv或引用限定不同即可。
Multiple functions in the same scope may have the same name, as long as their parameter lists and, for member functions, cv/ref qualifications are different.
In C++ terminology, normally class members(including the data members) are public(except see below Private Variables), and all member functions are virtual.
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