264 lines
6.7 KiB
C++
Executable File
264 lines
6.7 KiB
C++
Executable File
/* -*- mode: C++; indent-tabs-mode: nil; -*-
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*
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* This file is a part of LEMON, a generic C++ optimization library.
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*
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* Copyright (C) 2003-2013
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* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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* (Egervary Research Group on Combinatorial Optimization, EGRES).
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*
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* Permission to use, modify and distribute this software is granted
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* provided that this copyright notice appears in all copies. For
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* precise terms see the accompanying LICENSE file.
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*
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* This software is provided "AS IS" with no warranty of any kind,
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* express or implied, and with no claim as to its suitability for any
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* purpose.
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*
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*/
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#ifndef LEMON_GLPK_H
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#define LEMON_GLPK_H
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///\file
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///\brief Header of the LEMON-GLPK lp solver interface.
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///\ingroup lp_group
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#include <lemon/lp_base.h>
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namespace lemon {
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namespace _solver_bits {
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class VoidPtr {
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private:
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void *_ptr;
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public:
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VoidPtr() : _ptr(0) {}
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template <typename T>
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VoidPtr(T* ptr) : _ptr(reinterpret_cast<void*>(ptr)) {}
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template <typename T>
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VoidPtr& operator=(T* ptr) {
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_ptr = reinterpret_cast<void*>(ptr);
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return *this;
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}
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template <typename T>
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operator T*() const { return reinterpret_cast<T*>(_ptr); }
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};
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}
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/// \brief Base interface for the GLPK LP and MIP solver
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///
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/// This class implements the common interface of the GLPK LP and MIP solver.
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/// \ingroup lp_group
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class GlpkBase : virtual public LpBase {
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protected:
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_solver_bits::VoidPtr lp;
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GlpkBase();
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GlpkBase(const GlpkBase&);
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virtual ~GlpkBase();
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protected:
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virtual int _addCol();
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virtual int _addRow();
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virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u);
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virtual void _eraseCol(int i);
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virtual void _eraseRow(int i);
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virtual void _eraseColId(int i);
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virtual void _eraseRowId(int i);
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virtual void _getColName(int col, std::string& name) const;
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virtual void _setColName(int col, const std::string& name);
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virtual int _colByName(const std::string& name) const;
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virtual void _getRowName(int row, std::string& name) const;
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virtual void _setRowName(int row, const std::string& name);
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virtual int _rowByName(const std::string& name) const;
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virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
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virtual void _getRowCoeffs(int i, InsertIterator b) const;
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virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
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virtual void _getColCoeffs(int i, InsertIterator b) const;
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virtual void _setCoeff(int row, int col, Value value);
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virtual Value _getCoeff(int row, int col) const;
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virtual void _setColLowerBound(int i, Value value);
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virtual Value _getColLowerBound(int i) const;
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virtual void _setColUpperBound(int i, Value value);
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virtual Value _getColUpperBound(int i) const;
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virtual void _setRowLowerBound(int i, Value value);
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virtual Value _getRowLowerBound(int i) const;
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virtual void _setRowUpperBound(int i, Value value);
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virtual Value _getRowUpperBound(int i) const;
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virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
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virtual void _getObjCoeffs(InsertIterator b) const;
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virtual void _setObjCoeff(int i, Value obj_coef);
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virtual Value _getObjCoeff(int i) const;
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virtual void _setSense(Sense);
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virtual Sense _getSense() const;
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virtual void _clear();
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virtual void _messageLevel(MessageLevel level);
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virtual void _write(std::string file, std::string format) const;
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private:
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static void freeEnv();
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struct FreeEnvHelper {
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~FreeEnvHelper() {
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freeEnv();
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}
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};
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static FreeEnvHelper freeEnvHelper;
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protected:
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int _message_level;
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public:
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///Pointer to the underlying GLPK data structure.
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_solver_bits::VoidPtr lpx() {return lp;}
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///Const pointer to the underlying GLPK data structure.
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_solver_bits::VoidPtr lpx() const {return lp;}
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///Returns the constraint identifier understood by GLPK.
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int lpxRow(Row r) const { return rows(id(r)); }
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///Returns the variable identifier understood by GLPK.
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int lpxCol(Col c) const { return cols(id(c)); }
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#ifdef DOXYGEN
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/// Write the problem or the solution to a file in the given format
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/// This function writes the problem or the solution
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/// to a file in the given format.
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/// Trying to write in an unsupported format will trigger
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/// \ref LpBase::UnsupportedFormatError.
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/// \param file The file path
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/// \param format The output file format.
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/// Supportted formats are "MPS" and "LP".
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void write(std::string file, std::string format = "MPS") const {}
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#endif
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};
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/// \brief Interface for the GLPK LP solver
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///
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/// This class implements an interface for the GLPK LP solver.
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///\ingroup lp_group
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class GlpkLp : public LpSolver, public GlpkBase {
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public:
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///\e
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GlpkLp();
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///\e
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GlpkLp(const GlpkLp&);
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///\e
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virtual GlpkLp* cloneSolver() const;
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///\e
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virtual GlpkLp* newSolver() const;
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private:
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mutable std::vector<double> _primal_ray;
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mutable std::vector<double> _dual_ray;
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void _clear_temporals();
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protected:
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virtual const char* _solverName() const;
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virtual SolveExitStatus _solve();
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virtual Value _getPrimal(int i) const;
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virtual Value _getDual(int i) const;
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virtual Value _getPrimalValue() const;
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virtual VarStatus _getColStatus(int i) const;
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virtual VarStatus _getRowStatus(int i) const;
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virtual Value _getPrimalRay(int i) const;
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virtual Value _getDualRay(int i) const;
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virtual ProblemType _getPrimalType() const;
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virtual ProblemType _getDualType() const;
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public:
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///Solve with primal simplex
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SolveExitStatus solvePrimal();
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///Solve with dual simplex
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SolveExitStatus solveDual();
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private:
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bool _presolve;
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public:
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///Turns on or off the presolver
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///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
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///
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///The presolver is off by default.
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void presolver(bool presolve);
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};
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/// \brief Interface for the GLPK MIP solver
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///
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/// This class implements an interface for the GLPK MIP solver.
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///\ingroup lp_group
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class GlpkMip : public MipSolver, public GlpkBase {
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public:
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///\e
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GlpkMip();
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///\e
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GlpkMip(const GlpkMip&);
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virtual GlpkMip* cloneSolver() const;
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virtual GlpkMip* newSolver() const;
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protected:
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virtual const char* _solverName() const;
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virtual ColTypes _getColType(int col) const;
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virtual void _setColType(int col, ColTypes col_type);
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virtual SolveExitStatus _solve();
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virtual ProblemType _getType() const;
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virtual Value _getSol(int i) const;
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virtual Value _getSolValue() const;
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};
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} //END OF NAMESPACE LEMON
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#endif //LEMON_GLPK_H
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