Teuchos_NullIteratorTraits.hpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #ifndef TEUCHOS_NULL_ITERATOR_TRAITS_HPP
00030 #define TEUCHOS_NULL_ITERATOR_TRAITS_HPP
00031 
00032 
00033 #include "Teuchos_Ptr.hpp"
00034 
00035 
00036 namespace Teuchos {
00037 
00038 
00039 
00048 template<typename Iter>
00049 class NullIteratorTraits {
00050 public:
00051   static Iter getNull() { return Iter(0); }
00052 };
00053 
00054 
00059 template<typename Iter>
00060 void setToNull( const Ptr<Iter> &ptr )
00061 {
00062   *ptr = NullIteratorTraits<Iter>::getNull();
00063 }
00064 
00065 
00070 template<typename Iter>
00071 class NullIteratorTraits<std::reverse_iterator<Iter> > {
00072 public:
00073   static std::reverse_iterator<Iter> getNull()
00074     {
00075       return std::reverse_iterator<Iter>(
00076         NullIteratorTraits<Iter>::getNull()
00077         );
00078     }
00079 };
00080 
00081 
00082 } // namespace Teuchos
00083 
00084 
00085 #endif // TEUCHOS_NULL_ITERATOR_TRAITS_HPP

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