How to make my custom type to work with “range-based for loops”?

Question

Like many people these days I have been trying the different features that C++11 brings. One of my favorites is the \"range-based for loops\".

I understand that:

Answer 1

I write my answer because some people might be more happy with simple real life example without STL includes.

I have my own plain only data array implementation for some reason, and I wanted to use the range based for loop. Here is my solution:

 template 
 class PodArray {
 public:
   class iterator {
   public:
     iterator(DataType * ptr): ptr(ptr){}
     iterator operator++() { ++ptr; return *this; }
     bool operator!=(const iterator & other) const { return ptr != other.ptr; }
     const DataType& operator*() const { return *ptr; }
   private:
     DataType* ptr;
   };
 private:
   unsigned len;
   DataType *val;
 public:
   iterator begin() const { return iterator(val); }
   iterator end() const { return iterator(val + len); }

   // rest of the container definition not related to the question ...
 };

Then the usage example:

PodArray array;
// fill up array in some way
for(auto& c : array)
  printf("char: %c\n", c);