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// ***********************************************************************
//
// Teuchos: Common Tools Package
// Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library 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 2.1 of the
// License, or (at your option) any later version.
//
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef TEUCHOS_NULL_ITERATOR_TRAITS_HPP
#define TEUCHOS_NULL_ITERATOR_TRAITS_HPP
#include "Teuchos_ConfigDefs.hpp"
namespace Teuchos {
/** \brief Base traits class for getting a properly initialized null pointer.
*
* This default traits class simply passes in a raw '0' to the constructor.
* This works for a amazingly large number of classes that can be used a an
* iterator.
*
* \ingroup teuchos_mem_mng_grp
*/
template<typename Iter>
class NullIteratorTraits {
public:
static Iter getNull()
{
#ifdef TEUCHOS_NO_ZERO_ITERATOR_CONVERSION
return Iter();
#else
return Iter(0);
#endif
}
};
/** \brief Partial specialization for std::reverse_iterator.
*
* \ingroup teuchos_mem_mng_grp
*/
template<typename Iter>
class NullIteratorTraits<std::reverse_iterator<Iter> > {
public:
static std::reverse_iterator<Iter> getNull()
{
return std::reverse_iterator<Iter>(
NullIteratorTraits<Iter>::getNull()
);
}
};
} // namespace Teuchos
#endif // TEUCHOS_NULL_ITERATOR_TRAITS_HPP
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