/home/coin/SVN-release/CoinAll-1.1.0/Ipopt/src/Algorithm/LinearSolvers/IpSymLinearSolver.hpp

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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: IpSymLinearSolver.hpp 699 2006-04-05 21:05:18Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPSYMLINEARSOLVER_HPP__
#define __IPSYMLINEARSOLVER_HPP__

#include "IpUtils.hpp"
#include "IpSymMatrix.hpp"
#include "IpAlgStrategy.hpp"
#include <vector>

namespace Ipopt
{

  enum ESymSolverStatus {
    SYMSOLVER_SUCCESS,
    SYMSOLVER_SINGULAR,
    SYMSOLVER_WRONG_INERTIA,
    SYMSOLVER_CALL_AGAIN,
    SYMSOLVER_FATAL_ERROR
  };

  class SymLinearSolver: public AlgorithmStrategyObject
  {
  public:
    SymLinearSolver()
    {}

    virtual ~SymLinearSolver()
    {}

    virtual bool InitializeImpl(const OptionsList& options,
                                const std::string& prefix) = 0;

    virtual ESymSolverStatus MultiSolve(const SymMatrix &A,
                                        std::vector<SmartPtr<const Vector> >& rhsV,
                                        std::vector<SmartPtr<Vector> >& solV,
                                        bool check_NegEVals,
                                        Index numberOfNegEVals)=0;

    ESymSolverStatus Solve(const SymMatrix &A,
                           const Vector& rhs, Vector& sol,
                           bool check_NegEVals,
                           Index numberOfNegEVals)
    {
      std::vector<SmartPtr<const Vector> > rhsV(1);
      rhsV[0] = &rhs;
      std::vector<SmartPtr<Vector> > solV(1);
      solV[0] = &sol;
      return MultiSolve(A, rhsV, solV, check_NegEVals,
                        numberOfNegEVals);
    }

    virtual Index NumberOfNegEVals() const =0;

    //* @name Options of Linear solver */

    virtual bool IncreaseQuality() =0;

    virtual bool ProvidesInertia() const =0;
  };


} // namespace Ipopt

#endif

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