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virtual int CompareTo(IComparableObject const &obj)=0;
struct MyComparable : IComparableObject { int CompareTo(IComparableObject &other) { .. } };
struct MyComparable : IComparableObject { int CompareTo(MyComparable &other) { .. } };
struct MyComparable : IComparableObject { int CompareTo(IComparableObject &other) { try MyComparable &sibling = dynamic_cast(other); ... catch (..) { return 0; } } };
struct IComparableObject { virtual int CompareTo(IComparableObject obj)=0; };
struct MyComparable : IComparableObject { int CompareTo(IComparableObject &other) { throw 00; } };
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