PArrayIterator.h

#ifndef UTIL_P_ARRAY_ITERATOR_H
#define UTIL_P_ARRAY_ITERATOR_H

/*
* Util Package - C++ Utilities for Scientific Computation
*
* Copyright 2010 - 2017, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/

namespace Util
{

   template <typename Data>
   class PArrayIterator
   {

   public:

      PArrayIterator()
       : current_(0),
         end_(0),
         data_(0)
      {}

      void setCurrent(Data** ptr)
      { 
         current_ =  ptr;
         data_    = *ptr; 
      }

      void setEnd(Data** ptr)
      {  end_ = ptr; }

      void setNull()
      {
         current_ = 0; 
         end_     = 0; 
         data_    = 0; 
      }

      bool isEnd() const
      {  return (current_ == end_); }

      bool notEnd() const
      {  return (current_ != end_); }

      Data* get() const
      {  return data_; }


      
      Data& operator* () const
      {
         assert(data_); 
         return *data_; 
      }

      Data* operator -> () const
      {
         assert(data_); 
         return data_; 
      }

      PArrayIterator<Data>& operator++ ()
      {
         assert(current_);
         ++current_;
         if (current_ != end_) {
           data_ = *current_;
         } else {
           data_ = 0;
         }
         return *this;
      }

      
   private:

      // Pointer to the current Data* pointer.
      Data** current_;

      // Pointer to one element one past last Data* pointer in the set.
      Data** end_;

      // Pointer to current Data object.
      Data* data_;

   };

} 
#endif