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// Copyright (C) 2004, 2006 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpTNLP.hpp 1001 2007-06-18 20:36:53Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPTNLP_HPP__
#define __IPTNLP_HPP__

#include "IpUtils.hpp"
#include "IpReferenced.hpp"
#include "IpException.hpp"
#include "IpAlgTypes.hpp"
#include "IpReturnCodes.hpp"

namespace Ipopt
{
  // forward declarations
  class IpoptData;
  class IpoptCalculatedQuantities;
  class IteratesVector;

  class TNLP : public ReferencedObject
  {
  public:
    enum LinearityType
    {
      LINEAR,
      NON_LINEAR
    };

    TNLP()
    {}

    virtual ~TNLP()
    {}

    DECLARE_STD_EXCEPTION(INVALID_TNLP);

    enum IndexStyleEnum { C_STYLE=0, FORTRAN_STYLE=1 };
    virtual bool get_nlp_info(Index& n, Index& m, Index& nnz_jac_g,
                              Index& nnz_h_lag, IndexStyleEnum& index_style)=0;

    virtual bool get_bounds_info(Index n, Number* x_l, Number* x_u,
                                 Index m, Number* g_l, Number* g_u)=0;

    virtual bool get_scaling_parameters(Number& obj_scaling,
                                        bool& use_x_scaling, Index n,
                                        Number* x_scaling,
                                        bool& use_g_scaling, Index m,
                                        Number* g_scaling)
    {
      return false;
    }

    virtual bool get_variables_linearity(Index n, LinearityType* var_types)
    {
      return false;
    }

    virtual bool get_constraints_linearity(Index m, LinearityType* const_types)
    {
      return false;
    }

    virtual bool get_starting_point(Index n, bool init_x, Number* x,
                                    bool init_z, Number* z_L, Number* z_U,
                                    Index m, bool init_lambda,
                                    Number* lambda)=0;

    virtual bool get_warm_start_iterate(IteratesVector& warm_start_iterate)
    {
      return false;
    }

    virtual bool eval_f(Index n, const Number* x, bool new_x,
                        Number& obj_value)=0;

    virtual bool eval_grad_f(Index n, const Number* x, bool new_x,
                             Number* grad_f)=0;

    virtual bool eval_g(Index n, const Number* x, bool new_x,
                        Index m, Number* g)=0;
    virtual bool eval_jac_g(Index n, const Number* x, bool new_x,
                            Index m, Index nele_jac, Index* iRow,
                            Index *jCol, Number* values)=0;

    virtual bool eval_h(Index n, const Number* x, bool new_x,
                        Number obj_factor, Index m, const Number* lambda,
                        bool new_lambda, Index nele_hess,
                        Index* iRow, Index* jCol, Number* values)
    {
      return false;
    }

    virtual bool set_variable_values(Index n, const Number* x, bool new_x,
                                     Index m, const Number* lambda,
                                     bool new_lambda)
    {
      return false;
    }

    virtual void finalize_solution(SolverReturn status,
                                   Index n, const Number* x, const Number* z_L, const Number* z_U,
                                   Index m, const Number* g, const Number* lambda,
                                   Number obj_value,
                                   const IpoptData* ip_data,
                                   IpoptCalculatedQuantities* ip_cq)=0;

    virtual bool intermediate_callback(AlgorithmMode mode,
                                       Index iter, Number obj_value,
                                       Number inf_pr, Number inf_du,
                                       Number mu, Number d_norm,
                                       Number regularization_size,
                                       Number alpha_du, Number alpha_pr,
                                       Index ls_trials,
                                       const IpoptData* ip_data,
                                       IpoptCalculatedQuantities* ip_cq)
    {
      return true;
    }

    virtual Index get_number_of_nonlinear_variables()
    {
      return -1;
    }

    virtual bool get_list_of_nonlinear_variables(Index num_nonlin_vars,
        Index* pos_nonlin_vars)
    {
      return false;
    }

  private:
    //TNLP();

    TNLP(const TNLP&);

    void operator=(const TNLP&);
  };

} // namespace Ipopt

#endif

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