Sacado_mpl_find.hpp

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00001 // $Id$ 
00002 // $Source$ 
00003 // @HEADER
00004 // ***********************************************************************
00005 // 
00006 //                           Sacado Package
00007 //                 Copyright (2006) Sandia Corporation
00008 // 
00009 // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
00010 // the U.S. Government retains certain rights in this software.
00011 // 
00012 // This library is free software; you can redistribute it and/or modify
00013 // it under the terms of the GNU Lesser General Public License as
00014 // published by the Free Software Foundation; either version 2.1 of the
00015 // License, or (at your option) any later version.
00016 //  
00017 // This library is distributed in the hope that it will be useful, but
00018 // WITHOUT ANY WARRANTY; without even the implied warranty of
00019 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020 // Lesser General Public License for more details.
00021 //  
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License along with this library; if not, write to the Free Software
00024 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00025 // USA
00026 // Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
00027 // (etphipp@sandia.gov).
00028 // 
00029 // ***********************************************************************
00030 // @HEADER
00031 
00032 #ifndef SACADO_MPL_FIND_HPP
00033 #define SACADO_MPL_FIND_HPP
00034 
00035 #include "Sacado_mpl_none.hpp"
00036 #include "Sacado_mpl_begin.hpp"
00037 #include "Sacado_mpl_end.hpp"
00038 #include "Sacado_mpl_deref.hpp"
00039 #include "Sacado_mpl_next.hpp"
00040 #include "Sacado_mpl_is_same.hpp"
00041 #include "Sacado_mpl_if.hpp"
00042 
00043 namespace Sacado {
00044 
00045   namespace mpl {
00046 
00047     template <class Seq, class T>
00048     class TypeSequenceDoesNotContainType {};
00049 
00050     template <class Seq, 
00051         class T,
00052         class Iter1 = typename mpl::begin<Seq>::type, 
00053         class Iter2 = typename mpl::end<Seq>::type>
00054     struct find {
00055       static const int value = 
00056         mpl::mpl_if< mpl::is_same<typename mpl::deref<Iter1>::type, T>, 
00057                      Iter1,
00058                      find<Seq, T, typename mpl::next<Iter1>::type, 
00059                           Iter2> >::value;
00060     };
00061 
00062     template <class Seq, class T, class Iter1>
00063     struct find<Seq, T, Iter1, Iter1> {
00064       static const int value = TypeSequenceDoesNotContainType<Seq,T>::value;
00065     };
00066 
00067   }
00068 
00069 }
00070 
00071 #endif // SACADO_MPL_FIND_HPP

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