COIN-OR::LEMON - Graph Library

source: lemon-1.2/lemon/glpk.h @ 877:141f9c0db4a3

Last change on this file since 877:141f9c0db4a3 was 877:141f9c0db4a3, checked in by Alpar Juttner <alpar@…>, 10 years ago

Unify the sources (#339)

File size: 6.1 KB
Line 
1/* -*- mode: C++; indent-tabs-mode: nil; -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library.
4 *
5 * Copyright (C) 2003-2010
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
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.
12 *
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
15 * purpose.
16 *
17 */
18
19#ifndef LEMON_GLPK_H
20#define LEMON_GLPK_H
21
22///\file
23///\brief Header of the LEMON-GLPK lp solver interface.
24///\ingroup lp_group
25
26#include <lemon/lp_base.h>
27
28namespace lemon {
29
30  namespace _solver_bits {
31    class VoidPtr {
32    private:
33      void *_ptr;
34    public:
35      VoidPtr() : _ptr(0) {}
36
37      template <typename T>
38      VoidPtr(T* ptr) : _ptr(reinterpret_cast<void*>(ptr)) {}
39
40      template <typename T>
41      VoidPtr& operator=(T* ptr) {
42        _ptr = reinterpret_cast<void*>(ptr);
43        return *this;
44      }
45
46      template <typename T>
47      operator T*() const { return reinterpret_cast<T*>(_ptr); }
48    };
49  }
50
51  /// \brief Base interface for the GLPK LP and MIP solver
52  ///
53  /// This class implements the common interface of the GLPK LP and MIP solver.
54  /// \ingroup lp_group
55  class GlpkBase : virtual public LpBase {
56  protected:
57
58    _solver_bits::VoidPtr lp;
59
60    GlpkBase();
61    GlpkBase(const GlpkBase&);
62    virtual ~GlpkBase();
63
64  protected:
65
66    virtual int _addCol();
67    virtual int _addRow();
68    virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u);
69
70    virtual void _eraseCol(int i);
71    virtual void _eraseRow(int i);
72
73    virtual void _eraseColId(int i);
74    virtual void _eraseRowId(int i);
75
76    virtual void _getColName(int col, std::string& name) const;
77    virtual void _setColName(int col, const std::string& name);
78    virtual int _colByName(const std::string& name) const;
79
80    virtual void _getRowName(int row, std::string& name) const;
81    virtual void _setRowName(int row, const std::string& name);
82    virtual int _rowByName(const std::string& name) const;
83
84    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
85    virtual void _getRowCoeffs(int i, InsertIterator b) const;
86
87    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
88    virtual void _getColCoeffs(int i, InsertIterator b) const;
89
90    virtual void _setCoeff(int row, int col, Value value);
91    virtual Value _getCoeff(int row, int col) const;
92
93    virtual void _setColLowerBound(int i, Value value);
94    virtual Value _getColLowerBound(int i) const;
95
96    virtual void _setColUpperBound(int i, Value value);
97    virtual Value _getColUpperBound(int i) const;
98
99    virtual void _setRowLowerBound(int i, Value value);
100    virtual Value _getRowLowerBound(int i) const;
101
102    virtual void _setRowUpperBound(int i, Value value);
103    virtual Value _getRowUpperBound(int i) const;
104
105    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
106    virtual void _getObjCoeffs(InsertIterator b) const;
107
108    virtual void _setObjCoeff(int i, Value obj_coef);
109    virtual Value _getObjCoeff(int i) const;
110
111    virtual void _setSense(Sense);
112    virtual Sense _getSense() const;
113
114    virtual void _clear();
115
116    virtual void _messageLevel(MessageLevel level);
117
118  private:
119
120    static void freeEnv();
121
122    struct FreeEnvHelper {
123      ~FreeEnvHelper() {
124        freeEnv();
125      }
126    };
127
128    static FreeEnvHelper freeEnvHelper;
129
130  protected:
131
132    int _message_level;
133
134  public:
135
136    ///Pointer to the underlying GLPK data structure.
137    _solver_bits::VoidPtr lpx() {return lp;}
138    ///Const pointer to the underlying GLPK data structure.
139    _solver_bits::VoidPtr lpx() const {return lp;}
140
141    ///Returns the constraint identifier understood by GLPK.
142    int lpxRow(Row r) const { return rows(id(r)); }
143
144    ///Returns the variable identifier understood by GLPK.
145    int lpxCol(Col c) const { return cols(id(c)); }
146
147  };
148
149  /// \brief Interface for the GLPK LP solver
150  ///
151  /// This class implements an interface for the GLPK LP solver.
152  ///\ingroup lp_group
153  class GlpkLp : public LpSolver, public GlpkBase {
154  public:
155
156    ///\e
157    GlpkLp();
158    ///\e
159    GlpkLp(const GlpkLp&);
160
161    ///\e
162    virtual GlpkLp* cloneSolver() const;
163    ///\e
164    virtual GlpkLp* newSolver() const;
165
166  private:
167
168    mutable std::vector<double> _primal_ray;
169    mutable std::vector<double> _dual_ray;
170
171    void _clear_temporals();
172
173  protected:
174
175    virtual const char* _solverName() const;
176
177    virtual SolveExitStatus _solve();
178    virtual Value _getPrimal(int i) const;
179    virtual Value _getDual(int i) const;
180
181    virtual Value _getPrimalValue() const;
182
183    virtual VarStatus _getColStatus(int i) const;
184    virtual VarStatus _getRowStatus(int i) const;
185
186    virtual Value _getPrimalRay(int i) const;
187    virtual Value _getDualRay(int i) const;
188
189    virtual ProblemType _getPrimalType() const;
190    virtual ProblemType _getDualType() const;
191
192  public:
193
194    ///Solve with primal simplex
195    SolveExitStatus solvePrimal();
196
197    ///Solve with dual simplex
198    SolveExitStatus solveDual();
199
200  private:
201
202    bool _presolve;
203
204  public:
205
206    ///Turns on or off the presolver
207
208    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
209    ///
210    ///The presolver is off by default.
211    void presolver(bool presolve);
212
213  };
214
215  /// \brief Interface for the GLPK MIP solver
216  ///
217  /// This class implements an interface for the GLPK MIP solver.
218  ///\ingroup lp_group
219  class GlpkMip : public MipSolver, public GlpkBase {
220  public:
221
222    ///\e
223    GlpkMip();
224    ///\e
225    GlpkMip(const GlpkMip&);
226
227    virtual GlpkMip* cloneSolver() const;
228    virtual GlpkMip* newSolver() const;
229
230  protected:
231
232    virtual const char* _solverName() const;
233
234    virtual ColTypes _getColType(int col) const;
235    virtual void _setColType(int col, ColTypes col_type);
236
237    virtual SolveExitStatus _solve();
238    virtual ProblemType _getType() const;
239    virtual Value _getSol(int i) const;
240    virtual Value _getSolValue() const;
241
242  };
243
244
245} //END OF NAMESPACE LEMON
246
247#endif //LEMON_GLPK_H
248
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