How best to make iterators for a plain array within a unique_ptr in C++11?

I want to use the richness of with arrays held by unique_ptr. Here's the code I'd like to write ajuxt the code I am currently obliged to write:

void question() {
 const int len = 10;
 int a[len];
 unique_ptr<int[]> p(new int[len]);

 // i can do this with a bare array
 for_each(begin(a), end(a), [](int& v) { v = 0; });

 // but this doesn't compile cuz unique_ptr<T[]> doesn't implement dereference
 //  for_each(begin(*p), end(*p), [](int& v) { v = 0; });

 // this works, but ugly, and begin() and end() are not abstracted.
 for_each(&p[0], &p[len], [](int& v) { v = 0; });

 // how best to make iterators for an array within a unique_ptr?
}

Or might I be much better off using a container class instead of an array?