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