Declaring a member function with the const keyword specifies that the function is a "read-only" function that does not modify the object for which it is called.
struct
SockAddrIn : public SOCKADDR_IN {
public :
...
bool IsEqual(const SockAddrIn& sin) const;
//A read-only function, IsEqual cannot modify any data members or call any member functions that aren't constant.
void SetAddr(SOCKADDR_IN* psin) { memcpy(this, psin, Size()); }
//A write function, cannot be const
...
};
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