Sacado_Traits.hpp

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// $Id: Sacado_Traits.hpp,v 1.7 2008/06/16 17:06:35 etphipp Exp $ 
// $Source: /space/CVS/Trilinos/packages/sacado/src/Sacado_Traits.hpp,v $ 
// @HEADER
// ***********************************************************************
// 
//                           Sacado Package
//                 Copyright (2006) Sandia Corporation
// 
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
// 
// 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 David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
// (etphipp@sandia.gov).
// 
// ***********************************************************************
//
// The forward-mode AD classes in Sacado are a derivative work of the
// expression template classes in the Fad package by Nicolas Di Cesare.  
// The following banner is included in the original Fad source code:
//
// ************ DO NOT REMOVE THIS BANNER ****************
//
//  Nicolas Di Cesare <Nicolas.Dicesare@ann.jussieu.fr>
//  http://www.ann.jussieu.fr/~dicesare
//
//            CEMRACS 98 : C++ courses, 
//         templates : new C++ techniques 
//            for scientific computing 
// 
//********************************************************
//
//  NumericalTraits class to illustrate TRAITS
//
//********************************************************
// @HEADER

#ifndef SACADO_TRAITS_HPP
#define SACADO_TRAITS_HPP

namespace Sacado {


  template <typename A, typename B> struct Promote {};

  template <typename A> struct Promote<A,A> {
    typedef A type;
  };

#define SACADO_PROMOTE_SPECIALIZATION(type1,type2,type3) \
  template <> struct Promote< type1, type2 > {       \
    typedef type3 type;                        \
  };                 \
  template <> struct Promote< type2, type1 > {       \
    typedef type3 type;                  \
  };

  SACADO_PROMOTE_SPECIALIZATION(double,float,double)
  SACADO_PROMOTE_SPECIALIZATION(double,long,double)
  SACADO_PROMOTE_SPECIALIZATION(double,int,double)
  SACADO_PROMOTE_SPECIALIZATION(float,long,float)
  SACADO_PROMOTE_SPECIALIZATION(float,int,float)

#undef SACADO_PROMOTE_SPECIALIZATION


  template <typename T> struct ScalarType {};


  template <typename T> struct ValueType {};


  template <typename T> struct ScalarValueType {};


  template <typename T> struct IsADType {};


  template <typename T> struct IsScalarType {};


  template <typename T> struct Value {};

  template <typename T> struct MarkConstant {
    static void eval(T& x) {}
  };

#define SACADO_BUILTIN_SPECIALIZATION(t)                  \
  template <> struct ScalarType< t > {              \
    typedef t type;                 \
  };                                                      \
  template <> struct ValueType< t > {             \
    typedef t type;                 \
  };                                                      \
  template <> struct ScalarValueType< t > {     \
    typedef t type;                 \
  };                                                      \
  template <> struct IsADType< t > {              \
    static const bool value = false;              \
  };                                                      \
  template <> struct IsScalarType< t > {            \
    static const bool value = true;             \
  };                                                      \
  template <> struct Value< t > {             \
    static const t& eval(const t& x) { return x; }        \
  };

  SACADO_BUILTIN_SPECIALIZATION(char)
  SACADO_BUILTIN_SPECIALIZATION(float)
  SACADO_BUILTIN_SPECIALIZATION(double)
  SACADO_BUILTIN_SPECIALIZATION(int)
  SACADO_BUILTIN_SPECIALIZATION(unsigned int)
  SACADO_BUILTIN_SPECIALIZATION(long)
  SACADO_BUILTIN_SPECIALIZATION(unsigned long)
  SACADO_BUILTIN_SPECIALIZATION(bool)

#undef SACADO_BUILTIN_SPECIALIZATION

} // namespace Sacado

#endif // SACADO_TRAITS_HPP

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