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+// (C) Copyright International Business Machines Corporation 2007
+// All Rights Reserved.
+// This code is published under the Eclipse Public License.
+//
+// Authors :
+// Pierre Bonami, International Business Machines Corporation
+//
+// Date : 10/06/2007
+
+#ifndef __TMINLPQuad_HPP__
+#define __TMINLPQuad_HPP__
+
+#include "BonTMINLP2TNLP.hpp"
+#include "BonQuadRow.hpp"
+
+namespace Bonmin
+{
+
+
+  /** This is a derived class fro TMINLP2TNLP to handle adding quadratic cuts.
+   */
+  class TMINLP2TNLPQuadCuts : public Bonmin::TMINLP2TNLP
+  {
+  public:
+    /**@name Constructors/Destructors */
+    //@{
+    TMINLP2TNLPQuadCuts(const Ipopt::SmartPtr<Bonmin::TMINLP> tminlp
+#ifdef WARM_STARTER
+        ,
+        const OptionsList& options
+#endif
+        );
+
+
+    /** Copy Constructor 
+      * \warning source and copy point to the same tminlp_.
+      */
+    TMINLP2TNLPQuadCuts(const TMINLP2TNLPQuadCuts&);
+
+    /** Virtual copy.*/
+    virtual Bonmin::TMINLP2TNLP * clone() const{
+      printf("Cloning TMINLP2TNLPQuadCuts.\n");
+      return new TMINLP2TNLPQuadCuts(*this);}
+
+    /** Destructor */
+    virtual ~TMINLP2TNLPQuadCuts();
+    //@}
+    /**@name methods to gather information about the NLP */
+    //@{
+    /** This call is just passed onto parent class and add number of quadratic
+        cuts*/
+    virtual bool get_nlp_info(Ipopt::Index& n, Ipopt::Index& m, Ipopt::Index& nnz_jac_g,
+        Ipopt::Index& nnz_h_lag,
+        Ipopt::TNLP::IndexStyleEnum& index_style);
+
+    /** This call is just passed onto parent class and add bounds of quadratic
+        cuts*/
+    virtual bool get_bounds_info(Ipopt::Index n, Ipopt::Number* x_l, Ipopt::Number* x_u,
+        Ipopt::Index m, Ipopt::Number* g_l, Ipopt::Number* g_u);
+
+    virtual bool get_constraints_linearity(Ipopt::Index m, Ipopt::TNLP::LinearityType* const_types);
+
+    /** This call is just passed onto parent class and add 
+        lambda for quadratic cuts*/
+    virtual bool get_starting_point(Ipopt::Index n, bool init_x, Ipopt::Number* x,
+        bool init_z, Ipopt::Number* z_L, Ipopt::Number* z_U,
+        Ipopt::Index m, bool init_lambda,
+        Ipopt::Number* lambda);
+
+    /** Method that returns scaling parameters (passed to parent all quadratic
+        not scaled). 
+     */
+    virtual bool get_scaling_parameters(Ipopt::Number& obj_scaling,
+                                        bool& use_x_scaling, Ipopt::Index n,
+                                        Ipopt::Number* x_scaling,
+                                        bool& use_g_scaling, Ipopt::Index m,
+                                        Ipopt::Number* g_scaling);
+
+
+    /** Returns the value of the objective function in x*/
+    virtual bool eval_f(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+        Ipopt::Number& obj_value);
+
+    /** Returns the vector of the gradient of
+     *  the objective w.r.t. x */
+    virtual bool eval_grad_f(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+        Ipopt::Number* grad_f);
+
+    /** Returns the vector of constraint values in x (appends constraint values for quadratics).*/
+    virtual bool eval_g(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+        Ipopt::Index m, Ipopt::Number* g);
+
+    /** Returns the jacobian of the
+     *  constraints. The vectors iRow and jCol only need to be set
+     *  once. The first call is used to set the structure only (iRow
+     *  and jCol will be non-NULL, and values will be NULL) For
+     *  subsequent calls, iRow and jCol will be NULL. */
+    virtual bool eval_jac_g(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+        Ipopt::Index m, Ipopt::Index nele_jac, Ipopt::Index* iRow,
+        Ipopt::Index *jCol, Ipopt::Number* values);
+    /** compute the value of a single constraint */
+    virtual bool eval_gi(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+                         Ipopt::Index i, Ipopt::Number& gi);
+    /** compute the structure or values of the gradient for one
+        constraint */
+    virtual bool eval_grad_gi(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+                              Ipopt::Index i, Ipopt::Index& nele_grad_gi, Ipopt::Index* jCol,
+                              Ipopt::Number* values);
+    /** Return the hessian of the
+     *  lagrangian. The vectors iRow and jCol only need to be set once
+     *  (during the first call). The first call is used to set the
+     *  structure only (iRow and jCol will be non-NULL, and values
+     *  will be NULL) For subsequent calls, iRow and jCol will be
+     *  NULL. This matrix is symmetric - specify the lower diagonal
+     *  only */
+    virtual bool eval_h(Ipopt::Index n, const Ipopt::Number* x, bool new_x,
+        Ipopt::Number obj_factor, Ipopt::Index m, const Ipopt::Number* lambda,
+        bool new_lambda, Ipopt::Index nele_hess,
+        Ipopt::Index* iRow, Ipopt::Index* jCol, Ipopt::Number* values);
+    //@}
+
+
+    /** \name Cuts management. */
+    //@{
+
+
+    /** Add some linear or quadratic cuts to the problem formulation
+        if some of the OsiRowCuts are quadratic they will be well understood as long as safe is true.*/
+    void addCuts(const Cuts& cuts, bool safe);
+
+
+    /** Add some cuts to the problem formulaiton (handles Quadratics).*/
+    void addCuts(const OsiCuts &cuts);
+ 
+    /** Add some linear cuts to the problem formulation.*/
+   virtual void addCuts(unsigned int numberCuts, const OsiRowCut ** cuts);
+
+ 
+    /** Remove some cuts from the formulation */
+    void removeCuts(unsigned int number ,const int * toRemove);
+
+    //@}
+    //
+    /** Change objective to a linear one whith given objective function.*/
+    void set_linear_objective(int n_var, const double * obj, double c_0);
+
+    /** Reset objective to original one */
+    void reset_objective(){
+      obj_.clear();
+    }
+
+  protected:
+    /** Add some cuts to the problem formulaiton (handles Quadratics).*/
+    void addRowCuts(const OsiCuts &cuts, bool safe);
+    /**@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 */
+    TMINLP2TNLPQuadCuts();
+
+    /** Overloaded Equals Operator */
+    TMINLP2TNLPQuadCuts& operator=(const TMINLP2TNLP&);
+    //@}
+
+  private:
+  /** Some storage for quadratic cuts.*/
+  vector<QuadRow *> quadRows_;
+
+  /** Storage for the original hessian of the problem.*/
+  AdjustableMat H_;
+
+    /** print H_ for debug.*/
+    void printH();
+  /** Current umber of entries in the jacobian.*/
+  int curr_nnz_jac_;
+
+  /** Store user passed linear objective.*/
+  vector<double> obj_;
+  /** constant term in objective function.*/
+  double c_;
+  };
+
+} // namespace Ipopt
+
+#endif
+