Re: Declaring iterators
osmium wrote:
"desktop" wrote:
I am not sure I quite understand the use of iterators. I have this int
array:
int a[] = {1,2,3,4,5}
I would now like to make an iterator to the first and last element:
std::iterator<int> iter;
That construct is for the STL and arrays are not part of the STL. If you
want to implement the *properties* of an iterator, go ahead and write one.
But you can't use the one from STL.
Ok so if I want a generic function that works correctly on both int
arrays and vectors, I have to write a new iterator?
How do I check if an iterator has the right type?
I have read that you don't declare an iterator type like Forward, its up
to the function that you implement to make sure that it will satisfy the
properties of a Forward iterator.
That means that it is only by inspecting a function you can see which
iterators are supported. The compiler will not generate any error if I
have an iterator "iter" and then type:
--iter
because you cannot declare a Forward iterator explicitly. Or am I
missing something?