Why use iterators instead of array indices?

Question

Take the following two lines of code:

for (int i = 0; i < some_vector.size(); i++)
{
    //do stuff
}

And this:

for (som         


        

Answer 1

Aside from all of the other excellent answers... int may not be large enough for your vector. Instead, if you want to use indexing, use the size_type for your container:

for (std::vector::size_type i = 0; i < myvector.size(); ++i)
{
    Foo& this_foo = myvector[i];
    // Do stuff with this_foo
}