File: binary4.h

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c%2B%2B-annotations 13.02.02-1
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    class Binary
    {
        public:
            Binary();
            Binary(int value);
                // copy and move constructors are available by default, or
                // they can be explicitly declared and implemented.

            Binary &operator+=(Binary const &other) &;    // see the text
            Binary &&operator+=(Binary const &other) &&;

        private:
            void add(Binary const &rhs);

        friend Binary operator+(Binary const &lhs, Binary const &rhs);
        friend Binary operator+(Binary &&lhs, Binary const &rhs);
    };