for_each and normal function

if we use the for_each function with one list and one normal function then for each element the function will be called.

Then what is the advantage of using function object with for_each.

Code:

---

#include<iostream>
#include<algorithm>
#include<list>
using namespace std;

void addElem(int &elem)
{
    elem +=10;
}

class AddValue
{
    private:
        //the value to add
        int theValue;
    public:
        //constructor initializes the value to add
        AddValue(int val) : theValue(val) {}

        //the function call for the element adds the value
        void operator() (int& elem) const
        {
            elem += theValue;
        }
};


int main()
{
    list<int>lst1;
    int cnt=1;
    for(;cnt<11;)
    {
        lst1.push_back(cnt++);
    }
    list<int>::const_iterator itr = lst1.begin();
    for_each(lst1.begin(),lst1.end(),addElem);
    for(;itr != lst1.end();++itr)
    {
        cout<< *itr << "  ";
    }
    for_each(lst1.begin(),lst1.end(),addElem);
    itr=lst1.begin();
    cout<<endl;
    for(;itr != lst1.end();++itr)
    {
        cout<< *itr << "  ";
    }
cout<<endl<<"------------------"<<endl;
    for_each(lst1.begin(), lst1.end(),AddValue(10));
    itr=lst1.begin();
    for(;itr != lst1.end();++itr)
    {
        cout<< *itr << "  ";
    }
    for_each(lst1.begin(), lst1.end(),AddValue(10));
    itr=lst1.begin();
    cout<<endl;
    for(;itr != lst1.end();++itr)
    {
        cout<< *itr << "  ";
    }
    cout<<endl;
    return 0;
}

---

If i see the above code the calling a normal function and calling a function object is giving same flexibility and output.

Then why what is the real advantage of using function object here.

Quote:

---

Originally Posted by Rajesh1978

If i see the above code the calling a normal function and calling a function object is giving same flexibility and output.

Then why what is the real advantage of using function object here.

---

Change the code to perform adding by 20 instead of 10. You are not allowed to modify addElem or the AddValue class, or to create a new function or class.

I can just say Brilliant.

Thanks in one line u explained it very well