class box {public: box () { value = 0; } box (int i) { value = i; } box (box & a) { value = a.value; } ~box() { } // destructor void operator = (box & right) { value = right.value;} operator int () { return value; }private: int value;

class box {public: box () { value = 0; } box (int i) { value = i; } box (box & a) { value = a.value; } ~box() { } // destructor void operator = (box & right) { value = right.value;} operator int () { return value; }private: int value;

};

box operator + (box & left, box & right) {return box(((int) left) + (int) right);

}

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