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// Copyright (C) 2004, 2006 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// $Id: IpMuUpdate.hpp 1861 2010-12-21 21:34:47Z andreasw $
//
// Authors: Carl Laird, Andreas Waechter IBM 2004-08-13
#ifndef __IPMUUPDATE_HPP__
#define __IPMUUPDATE_HPP__
#include "IpAlgStrategy.hpp"
namespace Ipopt
{
/** Abstract Base Class for classes that implement methods for computing
* the barrier and fraction-to-the-boundary rule parameter for the
* current iteration.
*/
class MuUpdate : public AlgorithmStrategyObject
{
public:
/**@name Constructors/Destructors */
//@{
/** Default Constructor */
MuUpdate()
{}
/** Default destructor */
virtual ~MuUpdate()
{}
//@}
/** Initialize method - overloaded from AlgorithmStrategyObject */
virtual bool InitializeImpl(const OptionsList& options,
const std::string& prefix) = 0;
/** Method for determining the barrier parameter for the next
* iteration. A LineSearch object is passed, so that this method
* can call the Reset method in the LineSearch object, for
* example when then barrier parameter is changed. This method is
* also responsible for setting the fraction-to-the-boundary
* parameter tau. This method returns false if the update could
* not be performed and the algorithm should revert to an
* emergency fallback mechanism. */
virtual bool UpdateBarrierParameter() = 0;
private:
/**@name Default Compiler Generated Methods
* (Hidden to avoid implicit creation/calling).
* These methods are not implemented and
* we do not want the compiler to implement
* them for us, so we declare them private
* and do not define them. This ensures that
* they will not be implicitly created/called. */
//@{
/** Copy Constructor */
MuUpdate(const MuUpdate&);
/** Overloaded Equals Operator */
void operator=(const MuUpdate&);
//@}
};
} // namespace Ipopt
#endif
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