Re: erase function in vector

I've a vector of integer 4 4 4 5 9
suppose I deleted 5, i got 4 4 4 9
and sort by decreasing number ordering : 9 4 4 4
but when i output *(vector.end()), it aways show 9
But vector.end() still works when during loop.

vector<int> v;
// initialize
vector<int>::iterator ir = v.begin();
while(ir != v.end()){
   if(*ir == 5)
     ir = v.erase(ir);
   else
     ++ir;
}

cout << *v.end() << endl;
sort(v.begin(),v.end(), sortbySize);
cout << *v.end() << endl;
std::copy(v.begin(),v.end(), ostream_iterator<int>(cout, "\t"));