class box {public: ...const box & operator ++ () { value++; return *this; }

class box {public: ...const box & operator ++ () { value++; return *this; }

}

box mybox(3);

mybox++++; // error - cannot increment constant value

mybox+++= 7; // error - cannot assign to constant value

mybox++ = 7; // error - cannot assign to constant value

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