/usr/include/trilinos/Sacado_CacheFad_Expression.hpp is in libtrilinos-dev 10.4.0.dfsg-1ubuntu2.
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// $Source$
// @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
//
//********************************************************
//
// A short implementation ( not all operators and
// functions are overloaded ) of 1st order Automatic
// Differentiation in forward mode (FAD) using
// EXPRESSION TEMPLATES.
//
//********************************************************
// @HEADER
#ifndef SACADO_CACHEFAD_EXPRESSION_HPP
#define SACADO_CACHEFAD_EXPRESSION_HPP
#include "Sacado_Traits.hpp"
namespace Sacado {
namespace CacheFad {
//! Wrapper for a generic expression template
/*!
* This template class serves as a wrapper for all Fad expression
* template classes.
*/
template <typename ExprT>
class Expr {};
//! Constant expression template
/*!
* This template class represents a constant expression.
*/
template <typename ConstT>
class ConstExpr {
public:
//! Typename of argument values
typedef ConstT value_type;
//! Typename of scalar values
typedef ConstT scalar_type;
//! Constructor
ConstExpr(const ConstT& constant) : constant_(constant) {}
//! Return size of the derivative array of the operation
int size() const { return 0; }
//! Return if operation has fast access
bool hasFastAccess() const { return 1; }
//! Return value of operation
value_type val() const { return constant_; }
//! Return derivative component \c i of operation
value_type dx(int i) const { return value_type(0); }
//! Return derivative component \c i of operation
value_type fastAccessDx(int i) const { return value_type(0); }
protected:
//! The constant
const ConstT& constant_;
}; // class ConstExpr
} // namespace CacheFad
} // namespace Sacado
#endif // SACADO_CACHEFAD_EXPRESSION_HPP
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