#include <preprocessor.h>

Inheritance diagram for operations_research::glop::SingletonColumnSignPreprocessor:

Public Member Functions
	SingletonColumnSignPreprocessor (const GlopParameters *parameters)

	SingletonColumnSignPreprocessor (const SingletonColumnSignPreprocessor &)=delete

SingletonColumnSignPreprocessor &	operator= (const SingletonColumnSignPreprocessor &)=delete

	~SingletonColumnSignPreprocessor () final=default

bool	Run (LinearProgram *lp) final

void	RecoverSolution (ProblemSolution *solution) const final

Public Member Functions inherited from operations_research::glop::Preprocessor
	Preprocessor (const GlopParameters *parameters)

	Preprocessor (const Preprocessor &)=delete

Preprocessor &	operator= (const Preprocessor &)=delete

virtual	~Preprocessor ()

ProblemStatus	status () const

virtual void	UseInMipContext ()

void	SetTimeLimit (TimeLimit *time_limit)

Additional Inherited Members
Protected Member Functions inherited from operations_research::glop::Preprocessor
bool	IsSmallerWithinFeasibilityTolerance (Fractional a, Fractional b) const

bool	IsSmallerWithinPreprocessorZeroTolerance (Fractional a, Fractional b) const

Protected Attributes inherited from operations_research::glop::Preprocessor
ProblemStatus	status_

const GlopParameters &	parameters_

bool	in_mip_context_

std::unique_ptr< TimeLimit >	infinite_time_limit_

TimeLimit *	time_limit_

Detailed Description

SingletonColumnSignPreprocessor Make sure that the only coefficient of all singleton columns (i.e. column with only one entry) is positive. This is because this way the column will be transformed in an identity column by the scaling. This will lead to more efficient solve when this column is involved.

Definition at line 828 of file preprocessor.h.

Constructor & Destructor Documentation

◆ SingletonColumnSignPreprocessor() [1/2]

operations_research::glop::SingletonColumnSignPreprocessor::SingletonColumnSignPreprocessor ( const GlopParameters * parameters )

inlineexplicit

Definition at line 830 of file preprocessor.h.

◆ SingletonColumnSignPreprocessor() [2/2]

operations_research::glop::SingletonColumnSignPreprocessor::SingletonColumnSignPreprocessor ( const SingletonColumnSignPreprocessor & )

delete

◆ ~SingletonColumnSignPreprocessor()

operations_research::glop::SingletonColumnSignPreprocessor::~SingletonColumnSignPreprocessor ( )

finaldefault

Member Function Documentation

◆ operator=()

SingletonColumnSignPreprocessor & operations_research::glop::SingletonColumnSignPreprocessor::operator= ( const SingletonColumnSignPreprocessor & )

delete

◆ RecoverSolution()

void operations_research::glop::SingletonColumnSignPreprocessor::RecoverSolution ( ProblemSolution * solution ) const

finalvirtual

Stores the optimal solution of the linear program that was passed to Run(). The given solution needs to be set to the optimal solution of the linear program "modified" by Run().

Implements operations_research::glop::Preprocessor.

Definition at line 3031 of file preprocessor.cc.