Sort function does not work with function object created on stack?

Question

#include
#include
#include
class Integer
    {
public:
    int m;
    Integer(int a):m(a){};
    };
class CompareParts
            


        

Answer 1

obj2 is not a BinaryPredicate and is invalid as the third parameter to std::sort

obj2 needs to be something like

// Return whether first element is greater than the second
bool UDgreater ( int elem1, int elem2 )
{
   return elem1 > elem2;
}

or the functor type used by obj1.