Teuchos - Trilinos Tools Package Version of the Day
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_ConfigDefs.hpp"
00034 
00035 
00036 namespace Teuchos {
00037 
00038 
00039 
00048 template<typename Iter>
00049 class NullIteratorTraits {
00050 public:
00051   static Iter getNull()
00052   {
00053 #ifdef TEUCHOS_NO_ZERO_ITERATOR_CONVERSION
00054     return Iter();
00055 #else
00056     return Iter(0);
00057 #endif
00058   }
00059 };
00060 
00061 
00066 template<typename Iter>
00067 class NullIteratorTraits<std::reverse_iterator<Iter> > {
00068 public:
00069   static std::reverse_iterator<Iter> getNull()
00070     {
00071       return std::reverse_iterator<Iter>(
00072         NullIteratorTraits<Iter>::getNull()
00073         );
00074     }
00075 };
00076 
00077 
00078 } // namespace Teuchos
00079 
00080 
00081 #endif // TEUCHOS_NULL_ITERATOR_TRAITS_HPP
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