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Sacado_ELRFad_ExpressionTraits.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_ELRFAD_EXPRESSIONTRAITS_HPP
00033 #define SACADO_ELRFAD_EXPRESSIONTRAITS_HPP
00034 
00035 #include "Sacado_Traits.hpp"
00036 
00037 // Forward declarations
00038 namespace Sacado {
00039   namespace ELRFad {
00040     template <typename T> class Expr;
00041   }
00042 }
00043 
00044 namespace Sacado {
00045 
00046   // We don't specialize Promote because otherwise we can get ambiguous
00047   // partial specializations with the Fad classes.
00048 
00050   template <typename T>
00051   struct ScalarType< ELRFad::Expr<T> > {
00052     typedef typename ScalarType< typename ELRFad::Expr<T>::value_type >::type type;
00053   };
00054 
00056   template <typename T>
00057   struct ValueType< ELRFad::Expr<T> > {
00058     typedef typename ELRFad::Expr<T>::value_type type;
00059   };
00060 
00062   template <typename T>
00063   struct IsADType< ELRFad::Expr<T> > {
00064     static const bool value = true;
00065   };
00066 
00068   template <typename T>
00069   struct IsScalarType< ELRFad::Expr<T> > {
00070     static const bool value = false;
00071   };
00072 
00074   template <typename T>
00075   struct Value< ELRFad::Expr<T> > {
00076     typedef typename ValueType< ELRFad::Expr<T> >::type value_type;
00077     static const value_type& eval(const ELRFad::Expr<T>& x) { 
00078       return x.val(); }
00079   };
00080 
00082   template <typename T>
00083   struct ScalarValue< ELRFad::Expr<T> > {
00084     typedef typename ValueType< ELRFad::Expr<T> >::type value_type;
00085     typedef typename ScalarType< ELRFad::Expr<T> >::type scalar_type;
00086     static const scalar_type& eval(const ELRFad::Expr<T>& x) { 
00087       return ScalarValue<value_type>::eval(x.val()); }
00088   };
00089 
00090 } // namespace Sacado
00091 
00092 #endif // SACADO_ELRFAD_EXPRESSIONTRAITS_HPP
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