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

#include
#include
#include

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

class CompareParts {
public:
bool operator()(const Integer & p1,const Integer & p2)
{
return p1.m }
};

int main()
{
std::vector vecInteger;
vecInteger.push_back(Integer(12));
vecInteger.push_back(Integer(13));
vecInteger.push_back(Integer(5));
vecInteger.push_back(Integer(7));
vecInteger.push_back(Integer(9));

std::sort(vecInteger.begin(),vecInteger.end(),CompareParts()); 
typedef vector::const_iterator Iter;
Iter beg = vecInteger.begin();
Iter end = vecInteger.end();

for (Iter iter = beg; iter != end; ++iter)
    cout << (*iter).m << " ";

cout << endl;

}

Output: 5 7 9 12 13