What is an example of a c++ forwarditerator?

Question

I am looking for an example of an iterator which satisfies the limited qualities to be considered a ForwardIterator, while not being anything else in the hierarchy of iterators.

I have written a program which prints which of the five iterator categories an iterator conforms to. I have tested it for the other four iterator categories.

Answer 1

A typical example is std::forward_list<T>::iterator. Testing snippet:

#include <iostream>
#include <iterator>
#include <forward_list>
#include <vector>

template<typename T>
bool test = std::is_same <
                typename std::iterator_traits <
                    typename T::iterator
                >::iterator_category,
                std::forward_iterator_tag
            >::value ;

int main()
{
    // test wheter std::forward_list's iterator is a forward_iterator
    std::cout << std::boolalpha << test<std::forward_list<int>> << std::endl;
    // what about std::vector?
    std::cout << std::boolalpha << test<std::vector<int>>;
}

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