Sacado_Fad_Exp_Expression.hpp

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// @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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
// USA
// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
// (etphipp@sandia.gov).
//
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// @HEADER
 
#ifndef SACADO_FAD_EXP_EXPRESSION_HPP
#define SACADO_FAD_EXP_EXPRESSION_HPP
 
#include "Sacado_Traits.hpp"
 
namespace Sacado {
 
  namespace Fad {
  namespace Exp {


    template <typename T>
    class Expr {
    public:


      typedef T derived_type;


      SACADO_INLINE_FUNCTION
      const derived_type& derived() const {
        return static_cast<const derived_type&>(*this);
      }


      SACADO_INLINE_FUNCTION
      const volatile derived_type& derived() const volatile {
        return static_cast<const volatile derived_type&>(*this);
      }
    };


    template <typename T>
    struct ExprLevel {
      static constexpr unsigned value = 0;
    };
 
    template <typename T>
    struct ExprLevel< Expr<T> > {
      static constexpr unsigned value =
        ExprLevel< typename Expr<T>::value_type >::value + 1;
    };

    template <typename T>
    struct IsFadExpr {
      static constexpr bool value = false;
    };
 
    template <typename T>
    struct IsFadExpr< Expr<T> > {
      static constexpr bool value = true;
    };
 
    // Tag for delegating expression template specializations
    class ExprSpecDefault {};
 
  } // namespace Exp
  } // namespace Fad
 
  template <typename T>
  struct IsExpr< Fad::Exp::Expr<T> > {
    static constexpr bool value = true;
  };
 
  template <typename T>
  struct BaseExprType< Fad::Exp::Expr<T> > {
    typedef typename BaseExprType<T>::type type;
  };
 
} // namespace Sacado
 
#include "Sacado_SFINAE_Macros.hpp"
 
#endif // SACADO_FAD_EXP_EXPRESSION_HPP