NDFUniqConstIterator.hpp

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//==============================================================================
//
//  This file is part of GNSSTk, the ARL:UT GNSS Toolkit.
//
//  The GNSSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
//  by the Free Software Foundation; either version 3.0 of the License, or
//  any later version.
//
//  The GNSSTk is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with GNSSTk; if not, write to the Free Software Foundation,
//  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
//
//  This software was developed by Applied Research Laboratories at the
//  University of Texas at Austin.
//  Copyright 2004-2022, The Board of Regents of The University of Texas System
//
//==============================================================================
 
 
//==============================================================================
//
//  This software was developed by Applied Research Laboratories at the
//  University of Texas at Austin, under contract to an agency or agencies
//  within the U.S. Department of Defense. The U.S. Government retains all
//  rights to use, duplicate, distribute, disclose, or release this software.
//
//  Pursuant to DoD Directive 523024
//
//  DISTRIBUTION STATEMENT A: This software has been approved for public
//                            release, distribution is unlimited.
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//==============================================================================
#ifndef GNSSTK_NDFUNIQUECONSTITERATOR_HPP
#define GNSSTK_NDFUNIQUECONSTITERATOR_HPP
 
#include <type_traits>
 
namespace gnsstk
{
   template <typename T>
   class NDFUniqConstIterator
   {
   public:
      NDFUniqConstIterator()
            : map(nullptr)
      {}
      NDFUniqConstIterator(const T& omap)
            : nuit(omap.begin()), map(&omap)
      {}
      NDFUniqConstIterator(const T& omap, typename T::const_iterator i)
            : nuit(i), map(&omap)
      {}
      NDFUniqConstIterator& operator++()
      {
         nuit++;
         NavDataFactory *ndfp = dynamic_cast<NavDataFactory*>(
            nuit->second.get());
         while ((nuit != map->end()) && (uniques.count(ndfp) > 0))
         {
            nuit++;
            if (nuit != map->end())
            {
               ndfp = dynamic_cast<NavDataFactory*>(nuit->second.get());
            }
         }
         return *this;
      }
      const typename T::value_type& operator*()
      {
         if (nuit != map->end())
         {
            NavDataFactory *ndfp = dynamic_cast<NavDataFactory*>(
               nuit->second.get());
            uniques.insert(ndfp);
         }
         return *nuit;
      }
      NDFUniqConstIterator begin()
      { return NDFUniqConstIterator(*map); }
      NDFUniqConstIterator end()
      { return NDFUniqConstIterator(*map, map->end()); }
      bool operator!=(const NDFUniqConstIterator& i)
      { return ((map != i.map) || (nuit != i.nuit)); }
   private:
      typename T::const_iterator nuit;
      std::set<typename T::mapped_type::element_type*> uniques;
      const T* map;
   };
}
 
#endif // GNSSTK_NDFUNIQUECONSTITERATOR_HPP