Make primative array iterable

iterable.cpp

#include <string>
#include <iostream>

template <class T>
struct iterable_t {
 public:
  using iterator = T*;
  iterable_t(T* first, size_t size): head(first), tail(first + size), count(size){}
  iterable_t(T* first, T* end): head(first), tail(end), count(end - first){}
  T* begin() { return head; }
  T* end() { return tail; }
  size_t size() const { return count; }
 protected:
  T* head;
  T* tail;
  size_t count;
};

int main() {
  int a[] = {1,2,3,4,5};
  char b[] = {'a','b','c','d','e'};
  std::string c[] = {"one","two","three","four","five"};
  const size_t d[] = {11,12,13,14,15};

  for(const auto& i : iterable_t<int>(a, 5))
   std::cout << i << std::endl;

  for(const auto& i : iterable_t<char>(b, 5))
   std::cout << i << std::endl;

  for(const auto& i : iterable_t<std::string>(c, 5))
   std::cout << i << std::endl;

  iterable_t<const size_t> iterable(d, 5);
  for(iterable_t<const size_t>::iterator i = iterable.begin(); i != iterable.end(); ++i)
   std::cout << *i << std::endl;
}