range.hpp

  // C++11 sugar for use of ranged-based for over iterator
  // e.g.
  // for (auto &x : range(begin, end)) { ... }
  //
  constexpr struct
  {
    template<typename ForwardIterator>
    class range_helper
    {   
    public:
      range_helper(ForwardIterator begin, ForwardIterator end)
        : m_begin(std::move(begin))
        , m_end(std::move(end))
      {}  

      ForwardIterator begin()
      { return m_begin; }

      ForwardIterator end()
      { return m_end; }
    private:
      ForwardIterator m_begin, m_end;
    };  

    template<typename ForwardIterator>
    range_helper<ForwardIterator>
    operator () (ForwardIterator begin, ForwardIterator end)
    {   
      return range_helper<ForwardIterator>(begin, end);
    }   

  } range;