What do I do when there's no STL algorithm I need

template <class NeedleIterator, class HaystackIterator>

bool equals_zip(

 NeedleIterator needle_begin, NeedleIterator needle_end,

 HaystackIterator haystack_begin, HaystackIterator haystack_end

) {

 while (needle_begin != needle_end) {

   if (haystack_begin == haystack_end)

     return false;

   if (!(*needle_begin == *haystack_begin))

     return false;

   ++needle_begin;

   ++haystack_begin;

 return true;