spxstarter.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the class library                   */
/*       SoPlex --- the Sequential object-oriented simPlex.                  */
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/*  Copyright (c) 1996-2024 Zuse Institute Berlin (ZIB)                      */
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/*  Licensed under the Apache License, Version 2.0 (the "License");          */
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/*      http://www.apache.org/licenses/LICENSE-2.0                           */
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/**@file  spxstarter.h
 * @brief SoPlex start basis generation base class.
 */
#ifndef _SPXDSTARTER_H_
#define _SPXDSTARTER_H_
 
#include <assert.h>
 
#include "soplex/spxdefines.h"
#include "soplex/spxsolver.h"
 
namespace soplex
{
 
/**@brief   SoPlex start basis generation base class.
   @ingroup Algo
 
   SPxStarter is the virtual base class for classes generating a starter basis
   for the Simplex solver SoPlex. When a SPxStarter object has been loaded
   to a SoPlex solver, the latter will call method #generate() in order to
   have a start basis generated. Implementations of method #generate() must
   terminate by \ref soplex::SPxSolver::load() "loading" the generated basis to
   SoPlex. Loaded bases must be nonsingular.
*/
template <class R>
class SPxStarter
{
protected:
 
   //-------------------------------------
   /**@name Data */
   ///@{
   /// name of the starter
   const char* m_name;
   /// tolerances for the starter
   std::shared_ptr<Tolerances> _tolerances;
   ///@}
 
public:
 
   //-------------------------------------
   /**@name Data */
   ///@{
   /// constructor
   explicit SPxStarter(const char* name)
      : m_name(name)
   {}
   /// copy constructor
   SPxStarter(const SPxStarter& old)
      : m_name(old.m_name)
   {}
   /// assignment operator
   SPxStarter& operator=(const SPxStarter& rhs)
   {
      if(this != &rhs)
      {
         m_name = rhs.m_name;
      }
 
      return *this;
   }
   /// destructor.
   virtual ~SPxStarter()
   {
      m_name = nullptr;
   }
   /// clone function for polymorphism
   virtual SPxStarter* clone()const = 0;
   ///@}
 
   //-------------------------------------
   /**@name Access */
   ///@{
   /// get name of starter.
   virtual const char* getName() const
   {
      return m_name;
   }
   ///@}
 
   //-------------------------------------
   /**@name Starting */
   ///@{
   /// generates start basis for loaded basis.
   virtual void generate(SPxSolverBase<R>& base) = 0;
   ///@}
 
   /// set the tolerances to be used by the starter
   virtual void setTolerances(const std::shared_ptr<Tolerances>& tolerances)
   {
      _tolerances = tolerances;
   }
   /// get the toelrances used by the starter
   virtual const std::shared_ptr<Tolerances>& tolerances() const
   {
      return _tolerances;
   }
 
   //-------------------------------------
   /**@name Misc */
   ///@{
   /// checks consistency.
   virtual bool isConsistent() const;
   ///@}
 
private:
 
   //------------------------------------
   /**@name Blocked */
   ///@{
   /// we have no default constructor.
   SPxStarter();
   ///@}
 
};
} // namespace soplex
 
// For general templated functions
#include "spxstarter.hpp"
 
#endif // _SPXDSTARTER_H_