1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
3 * This file is a part of LEMON, a generic C++ optimization library.
5 * Copyright (C) 2003-2008
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
19 #ifndef LEMON_LP_GLPK_H
20 #define LEMON_LP_GLPK_H
23 ///\brief Header of the LEMON-GLPK lp solver interface.
26 #include <lemon/lp_base.h>
28 // forward declaration
31 typedef struct { double _prob; } glp_prob;
32 /* LP/MIP problem object */
38 /// \brief Interface for the GLPK LP solver
40 /// This class implements an interface for the GLPK LP solver.
42 class LpGlpk : virtual public LpSolverBase {
51 typedef LpSolverBase Parent;
54 LpGlpk(const LpGlpk &);
58 virtual LpSolverBase* _newLp();
59 virtual LpSolverBase* _copyLp();
61 virtual int _addCol();
62 virtual int _addRow();
63 virtual void _eraseCol(int i);
64 virtual void _eraseRow(int i);
65 virtual void _getColName(int col, std::string & name) const;
66 virtual void _setColName(int col, const std::string & name);
67 virtual int _colByName(const std::string& name) const;
68 virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
69 virtual void _getRowCoeffs(int i, RowIterator b) const;
70 virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
71 virtual void _getColCoeffs(int i, ColIterator b) const;
72 virtual void _setCoeff(int row, int col, Value value);
73 virtual Value _getCoeff(int row, int col) const;
75 virtual void _setColLowerBound(int i, Value value);
76 virtual Value _getColLowerBound(int i) const;
77 virtual void _setColUpperBound(int i, Value value);
78 virtual Value _getColUpperBound(int i) const;
80 virtual void _setRowBounds(int i, Value lower, Value upper);
81 virtual void _getRowBounds(int i, Value &lb, Value &ub) const;
82 virtual void _setObjCoeff(int i, Value obj_coef);
83 virtual Value _getObjCoeff(int i) const;
84 virtual void _clearObj();
88 ///\todo It should be clarified
90 virtual SolveExitStatus _solve();
91 virtual Value _getPrimal(int i) const;
92 virtual Value _getDual(int i) const;
93 virtual Value _getPrimalValue() const;
94 virtual bool _isBasicCol(int i) const;
97 ///\todo It should be clarified
99 virtual SolutionStatus _getPrimalStatus() const;
100 virtual SolutionStatus _getDualStatus() const;
101 virtual ProblemTypes _getProblemType() const;
103 virtual void _setMax();
104 virtual void _setMin();
106 virtual bool _isMax() const;
109 ///Set the verbosity of the messages
111 ///Set the verbosity of the messages
113 ///\param m is the level of the messages output by the solver routines.
114 ///The possible values are:
115 ///- 0 --- no output (default value)
116 ///- 1 --- error messages only
117 ///- 2 --- normal output
118 ///- 3 --- full output (includes informational messages)
119 void messageLevel(int m);
120 ///Turns on or off the presolver
122 ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
124 ///The presolver is off by default.
125 void presolver(bool b);
127 ///Pointer to the underlying GLPK data structure.
128 LPX *lpx() {return lp;}
130 ///Returns the constraint identifier understood by GLPK.
131 int lpxRow(Row r) { return _lpId(r); }
133 ///Returns the variable identifier understood by GLPK.
134 int lpxCol(Col c) { return _lpId(c); }
136 } //END OF NAMESPACE LEMON
138 #endif //LEMON_LP_GLPK_H