#include <iterator>
#include <cassert>
#include "../../iterators.h"
template <class It>
void
test(It i, typename std::iterator_traits<It>::difference_type n, It x)
{
assert(std::prev(i, n) == x);
}
template <class It>
void
test(It i, It x)
{
assert(std::prev(i) == x);
}
int main()
{
const char* s = "1234567890";
test(bidirectional_iterator<const char*>(s+10), 10, bidirectional_iterator<const char*>(s));
test(random_access_iterator<const char*>(s+10), 10, random_access_iterator<const char*>(s));
test(s+10, 10, s);
test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s));
test(random_access_iterator<const char*>(s+1), random_access_iterator<const char*>(s));
test(s+1, s);
}