OFB encode process in C++

Program ProgramIdiom 

/**

@parma T : block object

@parma FUNCTION_T : encryption functor type

@param target[in] encryption data block object (POD ok)

@param src[in] initial vector

@param count[in] number of target

@param encode_functor[in] encryption functor

 */

template<typename T,class FUNCTION_T>

inline T *ofb_encode_process(T *target,const T &src,

  size_t count,FUNCTION_T encode_func)

{

  size_t i;

  T ref_t = encode_func(src);;

  for(i=0;i<count;i++)

  {

    target[i] ^= ref_t;

    ref_t = encode_func(ref_t);

  }

  return target;

}