// In header: <boost/compute/memory/svm_ptr.hpp>
template<typename T> 
class svm_ptr {
public:
  // types
  typedef T                               value_type;       
  typedef std::ptrdiff_t                  difference_type;  
  typedef T *                             pointer;          
  typedef T &                             reference;        
  typedef std::random_access_iterator_tag iterator_category;
  // construct/copy/destruct
  svm_ptr();
  svm_ptr(void *, const context &);
  svm_ptr(const svm_ptr< T > &);
  svm_ptr< T > & operator=(const svm_ptr< T > &);
  ~svm_ptr();
  // public member functions
  void * get() const;
  svm_ptr< T > operator+(difference_type);
  difference_type operator-(svm_ptr< T >);
  context & get_context() const;
};