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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.
//
// 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 IPOPTLIB_EXPORT MuUpdate: public AlgorithmStrategyObject
{
public:
/**@name Constructors / Destructor */
///@{
/** Default Constructor */
MuUpdate()
{ }
/** Destructor */
virtual ~MuUpdate()
{ }
///@}
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&
);
/** Default Assignment Operator */
void operator=(
const MuUpdate&
);
///@}
};
} // namespace Ipopt
#endif