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// ***********************************************************************
//
// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
// Copyright (2003) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// 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 Roscoe A. Bartlett (rabartl@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef MERIT_FUNC_NLP_DIREC_DERIV_H
#define MERIT_FUNC_NLP_DIREC_DERIV_H
#include "ConstrainedOptPack_Types.hpp"
namespace ConstrainedOptPack {
/** \brief This class provides a mix-in interface for allowing subclass merit
* functions to compute the directional 1D derivative at a base point.
*
* The quantities Gf(xo) (gradient of f(xo))
* c(xo), h(xo) and d are used by several
* types of merit functions to calculate the derivative of:<br>
* d(phi(x_k + alpha_k*d_k))/d(alpha_k) at alpha_k = 0.
*
* It is generally assumed that d satisfies Gc_k'*d_k + c_k = 0 otherwise the
* merit function would need Gc_k to compute this directional derivative
* properly.
*/
class MeritFuncNLPDirecDeriv {
public:
/** \brief . */
virtual ~MeritFuncNLPDirecDeriv() {}
/** @name To be overridden by subclasses */
//@{
/** \brief Calculate d(phi(x_k + alpha_k*d_k))/d(alpha_k) at alpha_k = 0.
*
* The value is stored internally by the subclass are returned by its
* deriv() member usually. The value is also returned from this
* function.
*
* If the sizes of the vectors input do not aggree then
* #std::length_error# exception will be thrown.
*/
virtual value_type calc_deriv(
const Vector &Gf_k
,const Vector *c_k
,const Vector *h_k
,const Vector *hl
,const Vector *hu
,const Vector &d_k
) = 0;
//@}
}; // end class MeritFuncNLPDirecDeriv
} // end namespace ConstrainedOptPack
#endif // MERIT_FUNC_NLP_DIREC_DERIV_H
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