Question

Example:

for (vector<string>::reverse_iterator it = myV.rbegin(); it != myV.rend(); ++it)
{
  cout << "current value is: " << *it << ", and current position is: " << /*  */ << endl;
}

I know I could check how many items there are in the vector, make a counter, and so on. But I wonder if there is a more direct way of checking current index without asserting that I got the length of the vector right.

Answer 1

vector Iterators support difference you can subtract you current iterator it from rbegin.

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EDIT

As noted in a comment not all iterators support operator- so std::distance would have to be used. However I would not recommend this as std::distance will cause a liner time performance cost for iterators that are not random access while if you use it - begin() the compiler will tell you that won’t work and then you can use distance if you must.