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// Copyright (C) 2008 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// Authors: Andreas Waechter IBM 2008-08-31
#ifndef __IPINEXACTDOGLEGNORMAL_HPP__
#define __IPINEXACTDOGLEGNORMAL_HPP__
#include "IpInexactNormalStepCalc.hpp"
#include "IpInexactNewtonNormal.hpp"
#include "IpInexactNormalTerminationTester.hpp"
namespace Ipopt
{
/** Compute the normal step using a dogleg approach.
*/
class InexactDoglegNormalStep: public InexactNormalStepCalculator
{
public:
/**@name Constructors/Destructors */
///@{
/** Default Constructor */
InexactDoglegNormalStep(
SmartPtr<InexactNewtonNormalStep> newton_step,
SmartPtr<InexactNormalTerminationTester> normal_tester = NULL
);
/** Destructor */
virtual ~InexactDoglegNormalStep();
///@}
virtual bool InitializeImpl(
const OptionsList& options,
const std::string& prefix
);
/** Method for computing the normal step.
*
* The computed step is
* returned as normal_x and normal_s, for the x and s variables,
* respectively. These quantities are not slack-scaled. If the
* step cannot be computed, this method returns false.
*/
virtual bool ComputeNormalStep(
SmartPtr<Vector>& normal_x,
SmartPtr<Vector>& normal_s
);
static void RegisterOptions(
SmartPtr<RegisteredOptions> roptions
);
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.
*/
///@{
/** Default Constructor */
InexactDoglegNormalStep();
/** Copy Constructor */
InexactDoglegNormalStep(
const InexactDoglegNormalStep&
);
/** Overloaded Assignment Operator */
void operator=(
const InexactDoglegNormalStep&
);
///@}
/** Pointer to object for computing the "Newton" step in the dogleg
* method
*/
SmartPtr<InexactNewtonNormalStep> newton_step_;
/** Pointer to object that is used by the newton_step computation
* object to determine if iterative solver is done.
*
* This is needed here because this dogleg object is setting the
* value of the linearized constraint violation at the cauchy point
* if normal_tester is not NULL.
*/
SmartPtr<InexactNormalTerminationTester> normal_tester_;
/** @name Algorithmic options */
///@{
Number omega_max_;
///@}
/** Current value of the trust region factor */
Number curr_omega_;
/** Flag indicating if trust region was active in last iteration */
bool last_tr_inactive_;
};
} // namespace Ipopt
#endif