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+// Copyright (C) 2004, 2009 International Business Machines and others.
+// All Rights Reserved.
+// This code is published under the Eclipse Public License.
+//
+// $Id: IpIpoptData.hpp 2472 2014-04-05 17:47:20Z stefan $
+//
+// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13
+
+#ifndef __IPIPOPTDATA_HPP__
+#define __IPIPOPTDATA_HPP__
+
+#include "IpSymMatrix.hpp"
+#include "IpOptionsList.hpp"
+#include "IpIteratesVector.hpp"
+#include "IpRegOptions.hpp"
+#include "IpTimingStatistics.hpp"
+
+namespace Ipopt
+{
+
+  /* Forward declaration */
+  class IpoptNLP;
+
+  /** Base class for additional data that is special to a particular
+   *  type of algorithm, such as the CG penalty function, or using
+   *  iterative linear solvers.  The regular IpoptData object should
+   *  be given a derivation of this base class when it is created. */
+  class IpoptAdditionalData : public ReferencedObject
+  {
+  public:
+    /**@name Constructors/Destructors */
+    //@{
+    /** Default Constructor */
+    IpoptAdditionalData()
+    {}
+
+    /** Default destructor */
+    virtual ~IpoptAdditionalData()
+    {}
+    //@}
+
+    /** This method is called to initialize the global algorithmic
+     *  parameters.  The parameters are taken from the OptionsList
+     *  object. */
+    virtual bool Initialize(const Journalist& jnlst,
+                            const OptionsList& options,
+                            const std::string& prefix) = 0;
+
+    /** Initialize Data Structures at the beginning. */
+    virtual bool InitializeDataStructures() = 0;
+
+    /** Do whatever is necessary to accept a trial point as current
+     *  iterate.  This is also used to finish an iteration, i.e., to
+     *  release memory, and to reset any flags for a new iteration. */
+    virtual void AcceptTrialPoint() = 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 */
+    IpoptAdditionalData(const IpoptAdditionalData&);
+
+    /** Overloaded Equals Operator */
+    void operator=(const IpoptAdditionalData&);
+    //@}
+  };
+
+  /** Class to organize all the data required by the algorithm.
+   *  Internally, once this Data object has been initialized, all
+   *  internal curr_ vectors must always be set (so that prototyes are
+   *  available).  The current values can only be set from the trial
+   *  values.  The trial values can be set by copying from a vector or
+   *  by adding some fraction of a step to the current values.  This
+   *  object also stores steps, which allows to easily communicate the
+   *  step from the step computation object to the line search object.
+   */
+  class IpoptData : public ReferencedObject
+  {
+  public:
+    /**@name Constructors/Destructors */
+    //@{
+    /** Constructor */
+    IpoptData(SmartPtr<IpoptAdditionalData> add_data = NULL,
+              Number cpu_time_start = -1.);
+
+    /** Default destructor */
+    virtual ~IpoptData();
+    //@}
+
+    /** Initialize Data Structures */
+    bool InitializeDataStructures(IpoptNLP& ip_nlp,
+                                  bool want_x,
+                                  bool want_y_c,
+                                  bool want_y_d,
+                                  bool want_z_L,
+                                  bool want_z_U);
+
+    /** This method must be called to initialize the global
+     *  algorithmic parameters.  The parameters are taken from the
+     *  OptionsList object. */
+    bool Initialize(const Journalist& jnlst,
+                    const OptionsList& options,
+                    const std::string& prefix);
+
+    /** @name Get Methods for Iterates */
+    //@{
+    /** Current point */
+    inline
+    SmartPtr<const IteratesVector> curr() const;
+
+    /** Get the current point in a copied container that is non-const.
+    The entries in the container cannot be modified, but 
+    the container can be modified to point to new entries.
+    */
+    //    SmartPtr<IteratesVector> curr_container() const;
+
+    /** Get Trial point */
+    inline
+    SmartPtr<const IteratesVector> trial() const;
+
+    /** Get Trial point in a copied container that is non-const.
+     *  The entries in the container can not be modified, but
+     *  the container can be modified to point to new entries. 
+     */
+    //SmartPtr<IteratesVector> trial_container() const;
+
+    /** Set the trial point - this method copies the pointer for
+     *  efficiency (no copy and to keep cache tags the same) so
+     *  after you call set you cannot modify the data again
+     */
+    inline
+    void set_trial(SmartPtr<IteratesVector>& trial);
+
+    /** Set the values of the primal trial variables (x and s) from
+     *  provided Step with step length alpha.
+     */
+    void SetTrialPrimalVariablesFromStep(Number alpha,
+                                         const Vector& delta_x,
+                                         const Vector& delta_s);
+    /** Set the values of the trial values for the equality constraint
+     *  multipliers (y_c and y_d) from provided step with step length
+     *  alpha.
+     */
+    void SetTrialEqMultipliersFromStep(Number alpha,
+                                       const Vector& delta_y_c,
+                                       const Vector& delta_y_d);
+    /** Set the value of the trial values for the bound multipliers
+     *  (z_L, z_U, v_L, v_U) from provided step with step length
+     *  alpha.
+     */
+    void SetTrialBoundMultipliersFromStep(Number alpha,
+                                          const Vector& delta_z_L,
+                                          const Vector& delta_z_U,
+                                          const Vector& delta_v_L,
+                                          const Vector& delta_v_U);
+
+    /** ToDo: I may need to add versions of set_trial like the
+     *  following, but I am not sure 
+     */
+    // void set_trial(const SmartPtr<IteratesVector>& trial_iterates);
+    // void set_trial(SmartPtr<const IteratesVector>& trial_iterates);
+
+    /** get the current delta */
+    inline
+    SmartPtr<const IteratesVector> delta() const;
+
+    /** Set the current delta - like the trial point, this method copies
+     *  the pointer for efficiency (no copy and to keep cache tags the
+     *  same) so after you call set, you cannot modify the data
+     */
+    inline
+    void set_delta(SmartPtr<IteratesVector>& delta);
+
+    /** Set the current delta - like the trial point, this method
+     *  copies the pointer for efficiency (no copy and to keep cache
+     *  tags the same) so after you call set, you cannot modify the
+     *  data.  This is the version that is happy with a pointer to
+     *  const IteratesVector.
+     */
+    inline
+    void set_delta(SmartPtr<const IteratesVector>& delta);
+
+    /** Affine Delta */
+    inline
+    SmartPtr<const IteratesVector> delta_aff() const;
+
+    /** Set the affine delta - like the trial point, this method copies
+     *  the pointer for efficiency (no copy and to keep cache tags the
+     *  same) so after you call set, you cannot modify the data
+     */
+    inline
+    void set_delta_aff(SmartPtr<IteratesVector>& delta_aff);
+
+    /** Hessian or Hessian approximation (do not hold on to it, it might be changed) */
+    SmartPtr<const SymMatrix> W()
+    {
+      DBG_ASSERT(IsValid(W_));
+      return W_;
+    }
+
+    /** Set Hessian approximation */
+    void Set_W(SmartPtr<const SymMatrix> W)
+    {
+      W_ = W;
+    }
+
+    /** @name ("Main") Primal-dual search direction.  Those fields are
+     *  used to store the search directions computed from solving the
+     *  primal-dual system, and can be used in the line search.  They
+     *  are overwritten in every iteration, so do not hold on to the
+     *  pointers (make copies instead) */
+    //@{
+
+    /** Returns true, if the primal-dual step have been already
+     *  computed for the current iteration.  This flag is reset after
+     *  every call of AcceptTrialPoint().  If the search direction is
+     *  computed during the computation of the barrier parameter, the
+     *  method computing the barrier parameter should call
+     *  SetHaveDeltas(true) to tell the IpoptAlgorithm object that it
+     *  doesn't need to recompute the primal-dual step. */
+    bool HaveDeltas() const
+    {
+      return have_deltas_;
+    }
+
+    /** Method for setting the HaveDeltas flag.  This method should be
+     *  called if some method computes the primal-dual step (and
+     *  stores it in the delta_ fields of IpoptData) at an early part
+     *  of the iteration.  If that flag is set to true, the
+     *  IpoptAlgorithm object will not recompute the step. */
+    void SetHaveDeltas(bool have_deltas)
+    {
+      have_deltas_ = have_deltas;
+    }
+    //@}
+
+    /** @name Affine-scaling step.  Those fields can be used to store
+     *  the affine scaling step.  For example, if the method for
+     *  computing the current barrier parameter computes the affine
+     *  scaling steps, then the corrector step in the line search does
+     *  not have to recompute those solutions of the linear system. */
+    //@{
+
+    /** Returns true, if the affine-scaling step have been already
+     *  computed for the current iteration.  This flag is reset after
+     *  every call of AcceptTrialPoint().  If the search direction is
+     *  computed during the computation of the barrier parameter, the
+     *  method computing the barrier parameter should call
+     *  SetHaveDeltas(true) to tell the line search does not have to
+     *  recompute them in case it wants to do a corrector step. */
+    bool HaveAffineDeltas() const
+    {
+      return have_affine_deltas_;
+    }
+
+    /** Method for setting the HaveDeltas flag.  This method should be
+     *  called if some method computes the primal-dual step (and
+     *  stores it in the delta_ fields of IpoptData) at an early part
+     *  of the iteration.  If that flag is set to true, the
+     *  IpoptAlgorithm object will not recompute the step. */
+    void SetHaveAffineDeltas(bool have_affine_deltas)
+    {
+      have_affine_deltas_ = have_affine_deltas;
+    }
+    //@}
+
+    /** @name Public Methods for updating iterates */
+    //@{
+    /** Copy the trial values to the current values */
+    inline
+    void CopyTrialToCurrent();
+
+    /** Set the current iterate values from the
+     *  trial values. */
+    void AcceptTrialPoint();
+    //@}
+
+    /** @name General algorithmic data */
+    //@{
+    Index iter_count() const
+    {
+      return iter_count_;
+    }
+    void Set_iter_count(Index iter_count)
+    {
+      iter_count_ = iter_count;
+    }
+
+    Number curr_mu() const
+    {
+      DBG_ASSERT(mu_initialized_);
+      return curr_mu_;
+    }
+    void Set_mu(Number mu)
+    {
+      curr_mu_ = mu;
+      mu_initialized_ = true;
+    }
+    bool MuInitialized() const
+    {
+      return mu_initialized_;
+    }
+
+    Number curr_tau() const
+    {
+      DBG_ASSERT(tau_initialized_);
+      return curr_tau_;
+    }
+    void Set_tau(Number tau)
+    {
+      curr_tau_ = tau;
+      tau_initialized_ = true;
+    }
+    bool TauInitialized() const
+    {
+      return tau_initialized_;
+    }
+
+    void SetFreeMuMode(bool free_mu_mode)
+    {
+      free_mu_mode_ = free_mu_mode;
+    }
+    bool FreeMuMode() const
+    {
+      return free_mu_mode_;
+    }
+
+    /** Setting the flag that indicates if a tiny step (below machine
+     *  precision) has been detected */
+    void Set_tiny_step_flag(bool flag)
+    {
+      tiny_step_flag_ = flag;
+    }
+    bool tiny_step_flag()
+    {
+      return tiny_step_flag_;
+    }
+    //@}
+
+    /** Overall convergence tolerance.  It is used in the convergence
+     *  test, but also in some other parts of the algorithm that
+     *  depend on the specified tolerance, such as the minimum value
+     *  for the barrier parameter. */
+    //@{
+    /** Obtain the tolerance. */
+    Number tol() const
+    {
+      DBG_ASSERT(initialize_called_);
+      return tol_;
+    }
+    /** Set a new value for the tolerance.  One should be very careful
+     *  when using this, since changing the predefined tolerance might
+     *  have unexpected consequences.  This method is for example used
+     *  in the restoration convergence checker to tighten the
+     *  restoration phase convergence tolerance, if the restoration
+     *  phase converged to a point that has not a large value for the
+     *  constraint violation. */
+    void Set_tol(Number tol)
+    {
+      tol_ = tol;
+    }
+    //@}
+
+    /** Cpu time counter at the beginning of the optimization.  This
+     *  is useful to see how much CPU time has been spent in this
+     *  optimization run. */
+    Number cpu_time_start() const
+    {
+      return cpu_time_start_;
+    }
+
+    /** @name Information gathered for iteration output */
+    //@{
+    Number info_regu_x() const
+    {
+      return info_regu_x_;
+    }
+    void Set_info_regu_x(Number regu_x)
+    {
+      info_regu_x_ = regu_x;
+    }
+    Number info_alpha_primal() const
+    {
+      return info_alpha_primal_;
+    }
+    void Set_info_alpha_primal(Number alpha_primal)
+    {
+      info_alpha_primal_ = alpha_primal;
+    }
+    char info_alpha_primal_char() const
+    {
+      return info_alpha_primal_char_;
+    }
+    void Set_info_alpha_primal_char(char info_alpha_primal_char)
+    {
+      info_alpha_primal_char_ = info_alpha_primal_char;
+    }
+    Number info_alpha_dual() const
+    {
+      return info_alpha_dual_;
+    }
+    void Set_info_alpha_dual(Number alpha_dual)
+    {
+      info_alpha_dual_ = alpha_dual;
+    }
+    Index info_ls_count() const
+    {
+      return info_ls_count_;
+    }
+    void Set_info_ls_count(Index ls_count)
+    {
+      info_ls_count_ = ls_count;
+    }
+    bool info_skip_output() const
+    {
+      return info_skip_output_;
+    }
+    void Append_info_string(const std::string& add_str)
+    {
+      info_string_ += add_str;
+    }
+    const std::string& info_string() const
+    {
+      return info_string_;
+    }
+    /** Set this to true, if the next time when output is written, the
+     *  summary line should not be printed. */
+    void Set_info_skip_output(bool info_skip_output)
+    {
+      info_skip_output_ = info_skip_output;
+    }
+
+    /** gives time when the last summary output line was printed */
+    Number info_last_output()
+    {
+       return info_last_output_;
+    }
+    /** sets time when the last summary output line was printed */
+    void Set_info_last_output(Number info_last_output)
+    {
+       info_last_output_ = info_last_output;
+    }
+
+    /** gives number of iteration summaries actually printed
+     * since last summary header was printed */
+    int info_iters_since_header()
+    {
+       return info_iters_since_header_;
+    }
+    /** increases number of iteration summaries actually printed
+     * since last summary header was printed */
+    void Inc_info_iters_since_header()
+    {
+       info_iters_since_header_++;
+    }
+    /** sets number of iteration summaries actually printed
+     * since last summary header was printed */
+    void Set_info_iters_since_header(int info_iters_since_header)
+    {
+       info_iters_since_header_ = info_iters_since_header;
+    }
+
+    /** Reset all info fields */
+    void ResetInfo()
+    {
+      info_regu_x_ = 0;
+      info_alpha_primal_ = 0;
+      info_alpha_dual_ = 0.;
+      info_alpha_primal_char_ = ' ';
+      info_skip_output_ = false;
+      info_string_.erase();
+    }
+    //@}
+
+    /** Return Timing Statistics Object */
+    TimingStatistics& TimingStats()
+    {
+      return timing_statistics_;
+    }
+
+    /** Check if additional data has been set */
+    bool HaveAddData()
+    {
+      return IsValid(add_data_);
+    }
+
+    /** Get access to additional data object */
+    IpoptAdditionalData& AdditionalData()
+    {
+      return *add_data_;
+    }
+
+    /** Set a new pointer for additional Ipopt data */
+    void SetAddData(SmartPtr<IpoptAdditionalData> add_data)
+    {
+      DBG_ASSERT(!HaveAddData());
+      add_data_ = add_data;
+    }
+
+    /** Set the perturbation of the primal-dual system */
+    void setPDPert(Number pd_pert_x, Number pd_pert_s,
+                   Number pd_pert_c, Number pd_pert_d)
+    {
+      pd_pert_x_ = pd_pert_x;
+      pd_pert_s_ = pd_pert_s;
+      pd_pert_c_ = pd_pert_c;
+      pd_pert_d_ = pd_pert_d;
+    }
+
+    /** Get the current perturbation of the primal-dual system */
+    void getPDPert(Number& pd_pert_x, Number& pd_pert_s,
+                   Number& pd_pert_c, Number& pd_pert_d)
+    {
+      pd_pert_x = pd_pert_x_;
+      pd_pert_s = pd_pert_s_;
+      pd_pert_c = pd_pert_c_;
+      pd_pert_d = pd_pert_d_;
+    }
+
+    /** Methods for IpoptType */
+    //@{
+    static void RegisterOptions(const SmartPtr<RegisteredOptions>& roptions);
+    //@}
+
+  private:
+    /** @name Iterates */
+    //@{
+    /** Main iteration variables
+     * (current iteration) */
+    SmartPtr<const IteratesVector> curr_;
+
+    /** Main iteration variables
+     *  (trial calculations) */
+    SmartPtr<const IteratesVector> trial_;
+
+    /** Hessian (approximation) - might be changed elsewhere! */
+    SmartPtr<const SymMatrix> W_;
+
+    /** @name Primal-dual Step */
+    //@{
+    SmartPtr<const IteratesVector> delta_;
+    /** The following flag is set to true, if some other part of the
+     *  algorithm (like the method for computing the barrier
+     *  parameter) has already computed the primal-dual search
+     *  direction.  This flag is reset when the AcceptTrialPoint
+     *  method is called.
+     * ToDo: we could cue off of a null delta_;
+     */
+    bool have_deltas_;
+    //@}
+
+    /** @name Affine-scaling step.  This used to transfer the
+     *  information about the affine-scaling step from the computation
+     *  of the barrier parameter to the corrector (in the line
+     *  search). */
+    //@{
+    SmartPtr<const IteratesVector> delta_aff_;
+    /** The following flag is set to true, if some other part of the
+     *  algorithm (like the method for computing the barrier
+     *  parameter) has already computed the affine-scaling step.  This
+     *  flag is reset when the AcceptTrialPoint method is called.
+     * ToDo: we could cue off of a null delta_aff_;
+     */
+    bool have_affine_deltas_;
+    //@}
+
+    /** iteration count */
+    Index iter_count_;
+
+    /** current barrier parameter */
+    Number curr_mu_;
+    bool mu_initialized_;
+
+    /** current fraction to the boundary parameter */
+    Number curr_tau_;
+    bool tau_initialized_;
+
+    /** flag indicating if Initialize method has been called (for
+     *  debugging) */
+    bool initialize_called_;
+
+    /** flag for debugging whether we have already curr_ values
+     *  available (from which new Vectors can be generated */
+    bool have_prototypes_;
+
+    /** @name Global algorithm parameters.  Those are options that can
+     *  be modified by the user and appear at different places in the
+     *  algorithm.  They are set using an OptionsList object in the
+     *  Initialize method.  */
+    //@{
+    /** Overall convergence tolerance */
+    Number tol_;
+    //@}
+
+    /** @name Status data **/
+    //@{
+    /** flag indicating whether the algorithm is in the free mu mode */
+    bool free_mu_mode_;
+    /** flag indicating if a tiny step has been detected */
+    bool tiny_step_flag_;
+    //@}
+
+    /** @name Gathered information for iteration output */
+    //@{
+    /** Size of regularization for the Hessian */
+    Number info_regu_x_;
+    /** Primal step size */
+    Number info_alpha_primal_;
+    /** Info character for primal step size */
+    char info_alpha_primal_char_;
+    /** Dual step size */
+    Number info_alpha_dual_;
+    /** Number of backtracking trial steps */
+    Index info_ls_count_;
+    /** true, if next summary output line should not be printed (eg
+     *  after restoration phase. */
+    bool info_skip_output_;
+    /** any string of characters for the end of the output line */
+    std::string info_string_;
+    /** time when the last summary output line was printed */
+    Number info_last_output_;
+    /** number of iteration summaries actually printed since last
+     * summary header was printed */
+    int info_iters_since_header_;
+    //@}
+
+    /** VectorSpace for all the iterates */
+    SmartPtr<IteratesVectorSpace> iterates_space_;
+
+    /** TimingStatistics object collecting all Ipopt timing
+     *  statistics */
+    TimingStatistics timing_statistics_;
+
+    /** CPU time counter at initialization. */
+    Number cpu_time_start_;
+
+    /** Object for the data specific for the Chen-Goldfarb penalty
+     *  method algorithm */
+    SmartPtr<IpoptAdditionalData> add_data_;
+
+    /** @name Information about the perturbation of the primal-dual
+     *  system */
+    //@{
+    Number pd_pert_x_;
+    Number pd_pert_s_;
+    Number pd_pert_c_;
+    Number pd_pert_d_;
+    //@}
+
+    /**@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 */
+    IpoptData(const IpoptData&);
+
+    /** Overloaded Equals Operator */
+    void operator=(const IpoptData&);
+    //@}
+
+#if COIN_IPOPT_CHECKLEVEL > 0
+    /** Some debug flags to make sure vectors are not changed
+     *  behind the IpoptData's back
+     */
+    //@{
+    TaggedObject::Tag debug_curr_tag_;
+    TaggedObject::Tag debug_trial_tag_;
+    TaggedObject::Tag debug_delta_tag_;
+    TaggedObject::Tag debug_delta_aff_tag_;
+    TaggedObject::Tag debug_curr_tag_sum_;
+    TaggedObject::Tag debug_trial_tag_sum_;
+    TaggedObject::Tag debug_delta_tag_sum_;
+    TaggedObject::Tag debug_delta_aff_tag_sum_;
+    //@}
+#endif
+
+  };
+
+  inline
+  SmartPtr<const IteratesVector> IpoptData::curr() const
+  {
+    DBG_ASSERT(IsNull(curr_) || (curr_->GetTag() == debug_curr_tag_ && curr_->GetTagSum() == debug_curr_tag_sum_) );
+
+    return curr_;
+  }
+
+  inline
+  SmartPtr<const IteratesVector> IpoptData::trial() const
+  {
+    DBG_ASSERT(IsNull(trial_) || (trial_->GetTag() == debug_trial_tag_ && trial_->GetTagSum() == debug_trial_tag_sum_) );
+
+    return trial_;
+  }
+
+  inline
+  SmartPtr<const IteratesVector> IpoptData::delta() const
+  {
+    DBG_ASSERT(IsNull(delta_) || (delta_->GetTag() == debug_delta_tag_ && delta_->GetTagSum() == debug_delta_tag_sum_) );
+
+    return delta_;
+  }
+
+  inline
+  SmartPtr<const IteratesVector> IpoptData::delta_aff() const
+  {
+    DBG_ASSERT(IsNull(delta_aff_) || (delta_aff_->GetTag() == debug_delta_aff_tag_ && delta_aff_->GetTagSum() == debug_delta_aff_tag_sum_) );
+
+    return delta_aff_;
+  }
+
+  inline
+  void IpoptData::CopyTrialToCurrent()
+  {
+    curr_ = trial_;
+#if COIN_IPOPT_CHECKLEVEL > 0
+
+    if (IsValid(curr_)) {
+      debug_curr_tag_ = curr_->GetTag();
+      debug_curr_tag_sum_ = curr_->GetTagSum();
+    }
+    else {
+      debug_curr_tag_ = 0;
+      debug_curr_tag_sum_ = 0;
+    }
+#endif
+
+  }
+
+  inline
+  void IpoptData::set_trial(SmartPtr<IteratesVector>& trial)
+  {
+    trial_ = ConstPtr(trial);
+
+#if COIN_IPOPT_CHECKLEVEL > 0
+    // verify the correct space
+    DBG_ASSERT(trial_->OwnerSpace() == (VectorSpace*)GetRawPtr(iterates_space_));
+    if (IsValid(trial)) {
+      debug_trial_tag_ = trial->GetTag();
+      debug_trial_tag_sum_ = trial->GetTagSum();
+    }
+    else {
+      debug_trial_tag_ = 0;
+      debug_trial_tag_sum_ = 0;
+    }
+#endif
+
+    trial = NULL;
+  }
+
+  inline
+  void IpoptData::set_delta(SmartPtr<IteratesVector>& delta)
+  {
+    delta_ = ConstPtr(delta);
+#if COIN_IPOPT_CHECKLEVEL > 0
+
+    if (IsValid(delta)) {
+      debug_delta_tag_ = delta->GetTag();
+      debug_delta_tag_sum_ = delta->GetTagSum();
+    }
+    else {
+      debug_delta_tag_ = 0;
+      debug_delta_tag_sum_ = 0;
+    }
+#endif
+
+    delta = NULL;
+  }
+
+  inline
+  void IpoptData::set_delta(SmartPtr<const IteratesVector>& delta)
+  {
+    delta_ = delta;
+#if COIN_IPOPT_CHECKLEVEL > 0
+
+    if (IsValid(delta)) {
+      debug_delta_tag_ = delta->GetTag();
+      debug_delta_tag_sum_ = delta->GetTagSum();
+    }
+    else {
+      debug_delta_tag_ = 0;
+      debug_delta_tag_sum_ = 0;
+    }
+#endif
+
+    delta = NULL;
+  }
+
+  inline
+  void IpoptData::set_delta_aff(SmartPtr<IteratesVector>& delta_aff)
+  {
+    delta_aff_ = ConstPtr(delta_aff);
+#if COIN_IPOPT_CHECKLEVEL > 0
+
+    if (IsValid(delta_aff)) {
+      debug_delta_aff_tag_ = delta_aff->GetTag();
+      debug_delta_aff_tag_sum_ = delta_aff->GetTagSum();
+    }
+    else {
+      debug_delta_aff_tag_ = 0;
+      debug_delta_aff_tag_sum_ = delta_aff->GetTagSum();
+    }
+#endif
+
+    delta_aff = NULL;
+  }
+
+} // namespace Ipopt
+
+#endif