COIN-OR::LEMON - Graph Library

source: lemon-1.2/lemon/glpk.h @ 941:7c4ba7daaf5f

Last change on this file since 941:7c4ba7daaf5f was 832:5100072d83ca, checked in by Balazs Dezso <deba@…>, 10 years ago

Use void* like LPX object (#337)

File size: 6.0 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) 2003-2008
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
69    virtual void _eraseCol(int i);
70    virtual void _eraseRow(int i);
71
72    virtual void _eraseColId(int i);
73    virtual void _eraseRowId(int i);
74
75    virtual void _getColName(int col, std::string& name) const;
76    virtual void _setColName(int col, const std::string& name);
77    virtual int _colByName(const std::string& name) const;
78
79    virtual void _getRowName(int row, std::string& name) const;
80    virtual void _setRowName(int row, const std::string& name);
81    virtual int _rowByName(const std::string& name) const;
82
83    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
84    virtual void _getRowCoeffs(int i, InsertIterator b) const;
85
86    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
87    virtual void _getColCoeffs(int i, InsertIterator b) const;
88
89    virtual void _setCoeff(int row, int col, Value value);
90    virtual Value _getCoeff(int row, int col) const;
91
92    virtual void _setColLowerBound(int i, Value value);
93    virtual Value _getColLowerBound(int i) const;
94
95    virtual void _setColUpperBound(int i, Value value);
96    virtual Value _getColUpperBound(int i) const;
97
98    virtual void _setRowLowerBound(int i, Value value);
99    virtual Value _getRowLowerBound(int i) const;
100
101    virtual void _setRowUpperBound(int i, Value value);
102    virtual Value _getRowUpperBound(int i) const;
103
104    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
105    virtual void _getObjCoeffs(InsertIterator b) const;
106
107    virtual void _setObjCoeff(int i, Value obj_coef);
108    virtual Value _getObjCoeff(int i) const;
109
110    virtual void _setSense(Sense);
111    virtual Sense _getSense() const;
112
113    virtual void _clear();
114
115    virtual void _messageLevel(MessageLevel level);
116
117  private:
118
119    static void freeEnv();
120
121    struct FreeEnvHelper {
122      ~FreeEnvHelper() {
123        freeEnv();
124      }
125    };
126   
127    static FreeEnvHelper freeEnvHelper;
128
129  protected:
130   
131    int _message_level;
132   
133  public:
134
135    ///Pointer to the underlying GLPK data structure.
136    _solver_bits::VoidPtr lpx() {return lp;}
137    ///Const pointer to the underlying GLPK data structure.
138    _solver_bits::VoidPtr lpx() const {return lp;}
139
140    ///Returns the constraint identifier understood by GLPK.
141    int lpxRow(Row r) const { return rows(id(r)); }
142
143    ///Returns the variable identifier understood by GLPK.
144    int lpxCol(Col c) const { return cols(id(c)); }
145
146  };
147
148  /// \brief Interface for the GLPK LP solver
149  ///
150  /// This class implements an interface for the GLPK LP solver.
151  ///\ingroup lp_group
152  class GlpkLp : public LpSolver, public GlpkBase {
153  public:
154
155    ///\e
156    GlpkLp();
157    ///\e
158    GlpkLp(const GlpkLp&);
159
160    ///\e
161    virtual GlpkLp* cloneSolver() const;
162    ///\e
163    virtual GlpkLp* newSolver() const;
164
165  private:
166
167    mutable std::vector<double> _primal_ray;
168    mutable std::vector<double> _dual_ray;
169
170    void _clear_temporals();
171
172  protected:
173
174    virtual const char* _solverName() const;
175
176    virtual SolveExitStatus _solve();
177    virtual Value _getPrimal(int i) const;
178    virtual Value _getDual(int i) const;
179
180    virtual Value _getPrimalValue() const;
181
182    virtual VarStatus _getColStatus(int i) const;
183    virtual VarStatus _getRowStatus(int i) const;
184
185    virtual Value _getPrimalRay(int i) const;
186    virtual Value _getDualRay(int i) const;
187
188    virtual ProblemType _getPrimalType() const;
189    virtual ProblemType _getDualType() const;
190
191  public:
192
193    ///Solve with primal simplex
194    SolveExitStatus solvePrimal();
195
196    ///Solve with dual simplex
197    SolveExitStatus solveDual();
198
199  private:
200
201    bool _presolve;
202
203  public:
204
205    ///Turns on or off the presolver
206
207    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
208    ///
209    ///The presolver is off by default.
210    void presolver(bool presolve);
211
212  };
213
214  /// \brief Interface for the GLPK MIP solver
215  ///
216  /// This class implements an interface for the GLPK MIP solver.
217  ///\ingroup lp_group
218  class GlpkMip : public MipSolver, public GlpkBase {
219  public:
220
221    ///\e
222    GlpkMip();
223    ///\e
224    GlpkMip(const GlpkMip&);
225
226    virtual GlpkMip* cloneSolver() const;
227    virtual GlpkMip* newSolver() const;
228
229  protected:
230
231    virtual const char* _solverName() const;
232
233    virtual ColTypes _getColType(int col) const;
234    virtual void _setColType(int col, ColTypes col_type);
235
236    virtual SolveExitStatus _solve();
237    virtual ProblemType _getType() const;
238    virtual Value _getSol(int i) const;
239    virtual Value _getSolValue() const;
240
241  };
242
243
244} //END OF NAMESPACE LEMON
245
246#endif //LEMON_GLPK_H
247
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