Iterator Help

[TheToaster]

So I learned about iterators a few weeks ago and I decided to review today to keep things fresh in my mind. What i really couldn't understand is the use of "begin()" in a random access iterator.

  Integer1 = Iter1 - begin(Elements);

What does it mean when you subtract the begin iterator? I know the index value for the beginning of an array is 0, so are you subtracting nothing? Please clarify.

[magnum pi]

When you do iterator arithmetic (only allowed on random access iterators, remember), you don't really subtract the index that the iterator represents, you perform pseudo pointer-arithmetic on the iterators themselves. So if I have "int i = someIterator - container.begin()" I assign "i" to the number of elements between "someIterator" and "container.begin()".

[TheToaster]

Ah, I see.Thank you for clarifying. This is solved