operations_research::glop::ColumnDeletionHelper Class Reference

Help preprocessors deal with column deletion. More...

#include <preprocessor.h>

Public Member Functions
	ColumnDeletionHelper ()=default
	ColumnDeletionHelper (const ColumnDeletionHelper &)=delete
ColumnDeletionHelper &	operator= (const ColumnDeletionHelper &)=delete
void	MarkColumnForDeletion (ColIndex col)
void	MarkColumnForDeletionWithState (ColIndex col, Fractional value, VariableStatus status)
void	RestoreDeletedColumns (ProblemSolution *solution) const
bool	IsColumnMarked (ColIndex col) const
	Returns whether or not the given column is marked for deletion.
const DenseBooleanRow &	GetMarkedColumns () const
	Returns a Boolean vector of the column to be deleted.
bool	IsEmpty () const
	Returns true if no columns have been marked for deletion.
void	Clear ()
	Restores the class to its initial state.
const DenseRow &	GetStoredValue () const

Detailed Description

Help preprocessors deal with column deletion.

Definition at line 182 of file preprocessor.h.

Constructor & Destructor Documentation

ColumnDeletionHelper() [1/2]

operations_research::glop::ColumnDeletionHelper::ColumnDeletionHelper ( )

default

ColumnDeletionHelper() [2/2]

operations_research::glop::ColumnDeletionHelper::ColumnDeletionHelper ( const ColumnDeletionHelper & )

delete

Member Function Documentation

Clear()

void operations_research::glop::ColumnDeletionHelper::Clear

(

)

Restores the class to its initial state.

Definition at line 246 of file preprocessor.cc.

GetMarkedColumns()

const DenseBooleanRow & operations_research::glop::ColumnDeletionHelper::GetMarkedColumns ( ) const

inline

Returns a Boolean vector of the column to be deleted.

Definition at line 210 of file preprocessor.h.

GetStoredValue()

const DenseRow & operations_research::glop::ColumnDeletionHelper::GetStoredValue ( ) const

inline

Returns the value that will be restored by RestoreDeletedColumnInSolution(). Note that only the marked position value make sense.

Definition at line 221 of file preprocessor.h.

IsColumnMarked()

bool operations_research::glop::ColumnDeletionHelper::IsColumnMarked ( ColIndex col ) const

inline

Returns whether or not the given column is marked for deletion.

Definition at line 205 of file preprocessor.h.

IsEmpty()

bool operations_research::glop::ColumnDeletionHelper::IsEmpty ( ) const

inline

Returns true if no columns have been marked for deletion.

Definition at line 213 of file preprocessor.h.

MarkColumnForDeletion()

void operations_research::glop::ColumnDeletionHelper::MarkColumnForDeletion

(

ColIndex

col

)

Remember the given column as "deleted" so that it can later be restored by RestoreDeletedColumns(). Optionally, the caller may indicate the value and status of the corresponding variable so that it is automatically restored; if they don't then the restored value and status will be junk and must be set by the caller.

The actual deletion is done by LinearProgram::DeleteColumns().

Definition at line 251 of file preprocessor.cc.

MarkColumnForDeletionWithState()

void operations_research::glop::ColumnDeletionHelper::MarkColumnForDeletionWithState	(	ColIndex	col,
		Fractional	value,
		VariableStatus	status )

Definition at line 255 of file preprocessor.cc.

operator=()

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

delete

RestoreDeletedColumns()

void operations_research::glop::ColumnDeletionHelper::RestoreDeletedColumns

(

ProblemSolution *

solution

)

const

From a solution omitting the deleted column, expands it and inserts the deleted columns. If values and statuses for the corresponding variables were saved, they'll be restored.

Copy the end of the vectors and swap them with the ones in solution.

Definition at line 268 of file preprocessor.cc.

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The documentation for this class was generated from the following files:

• ortools/glop/preprocessor.h
• ortools/glop/preprocessor.cc