MoochoPack_ReducedHessianSecantUpdate_Strategy.hpp

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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.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public
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// Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
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#ifndef REDUCED_HESSIAN_SECANT_UPDATE_STRATEGY_H
#define REDUCED_HESSIAN_SECANT_UPDATE_STRATEGY_H

#include "MoochoPack_Types.hpp"

namespace MoochoPack {

class ReducedHessianSecantUpdate_Strategy {
public:
  
  virtual ~ReducedHessianSecantUpdate_Strategy() {}

  virtual bool perform_update(
    VectorMutable     *s_bfgs
    ,VectorMutable   *y_bfgs
    ,bool                   first_update
    ,std::ostream           & out
    ,EJournalOutputLevel    olevel
    ,NLPAlgo               *algo
    ,NLPAlgoState              *s
    ,MatrixSymOp        *rHL_k
    ) = 0;
  
  virtual void print_step( std::ostream& out, const std::string& leading_str ) const = 0;

}; // end class ReducedHessianSecantUpdate_Strategy

}  // end namespace MoochoPack

#endif // REDUCED_HESSIAN_SECANT_UPDATE_STRATEGY_H

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