Inheritance diagram for operations_research::GLOPInterface:

Public Member Functions
	GLOPInterface (MPSolver *solver)

	~GLOPInterface () override

MPSolver::ResultStatus	Solve (const MPSolverParameters &param) override
	--— Solve --—

bool	InterruptSolve () override

void	Reset () override
	--— Model modifications and extraction --—

void	SetOptimizationDirection (bool maximize) override
	Sets the optimization direction (min/max).

void	SetVariableBounds (int index, double lb, double ub) override
	Modifies bounds of an extracted variable.

void	SetVariableInteger (int index, bool integer) override
	Modifies integrality of an extracted variable.

void	SetConstraintBounds (int index, double lb, double ub) override
	Modify bounds of an extracted variable.

void	AddRowConstraint (MPConstraint *ct) override
	Adds a linear constraint.

void	AddVariable (MPVariable *var) override
	Add a variable.

void	SetCoefficient (MPConstraint constraint, const MPVariable variable, double new_value, double old_value) override
	Changes a coefficient in a constraint.

void	ClearConstraint (MPConstraint *constraint) override
	Clears a constraint from all its terms.

void	SetObjectiveCoefficient (const MPVariable *variable, double coefficient) override
	Changes a coefficient in the linear objective.

void	SetObjectiveOffset (double value) override
	Changes the constant term in the linear objective.

void	ClearObjective () override
	Clears the objective from all its terms.

int64_t	iterations () const override
	---— Query statistics on the solution and the solve ---—

int64_t	nodes () const override

MPSolver::BasisStatus	row_status (int constraint_index) const override
	Returns the basis status of a row.

MPSolver::BasisStatus	column_status (int variable_index) const override
	Returns the basis status of a constraint.

bool	IsContinuous () const override
	--— Misc --—

bool	IsLP () const override
	Returns true if the problem is continuous and linear.

bool	IsMIP () const override
	Returns true if the problem is discrete and linear.

std::string	SolverVersion () const override
	Returns a string describing the underlying solver and its version.

void *	underlying_solver () override
	Returns the underlying solver.

void	ExtractNewVariables () override
	Extracts the variables that have not been extracted yet.

void	ExtractNewConstraints () override
	Extracts the constraints that have not been extracted yet.

void	ExtractObjective () override
	Extracts the objective.

void	SetStartingLpBasis (const std::vector< MPSolver::BasisStatus > &variable_statuses, const std::vector< MPSolver::BasisStatus > &constraint_statuses) override
	See MPSolver::SetStartingLpBasis().

void	SetParameters (const MPSolverParameters &param) override
	Sets all parameters in the underlying solver.

void	SetRelativeMipGap (double value) override
	Sets each parameter in the underlying solver.

void	SetPrimalTolerance (double value) override

void	SetDualTolerance (double value) override

void	SetPresolveMode (int value) override

void	SetScalingMode (int value) override
	Sets the scaling mode.

void	SetLpAlgorithm (int value) override

bool	SetSolverSpecificParametersAsString (const std::string &parameters) override

Public Member Functions inherited from operations_research::MPSolverInterface
	MPSolverInterface (MPSolver *solver)

virtual	~MPSolverInterface ()

virtual std::optional< MPSolutionResponse >	DirectlySolveProto (const MPModelRequest &, std::atomic< bool > *)

virtual void	Write (const std::string &filename)

virtual bool	AddIndicatorConstraint (MPConstraint *const)

virtual void	BranchingPriorityChangedForVariable (int)

double	best_objective_bound () const

double	objective_value () const
	Returns the objective value of the best solution found so far.

bool	CheckSolutionIsSynchronized () const

virtual bool	CheckSolutionExists () const

bool	CheckSolutionIsSynchronizedAndExists () const
	Handy shortcut to do both checks above (it is often used).

int	last_variable_index () const
	Returns the index of the last variable extracted.

bool	variable_is_extracted (int var_index) const

void	set_variable_as_extracted (int var_index, bool extracted)

bool	constraint_is_extracted (int ct_index) const

void	set_constraint_as_extracted (int ct_index, bool extracted)

bool	quiet () const
	Returns the boolean indicating the verbosity of the solver output.

void	set_quiet (bool quiet_value)
	Sets the boolean indicating the verbosity of the solver output.

MPSolver::ResultStatus	result_status () const
	Returns the result status of the last solve.

virtual double	ComputeExactConditionNumber () const

virtual double	infinity ()

virtual bool	NextSolution ()
	See MPSolver::NextSolution() for contract.

virtual void	SetCallback (MPCallback *)
	See MPSolver::SetCallback() for details.

virtual bool	SupportsCallbacks () const

Additional Inherited Members
Public Types inherited from operations_research::MPSolverInterface
enum	SynchronizationStatus { MUST_RELOAD , MODEL_SYNCHRONIZED , SOLUTION_SYNCHRONIZED }

Static Public Attributes inherited from operations_research::MPSolverInterface
static constexpr int64_t	kUnknownNumberOfIterations = -1

static constexpr int64_t	kUnknownNumberOfNodes = -1

Protected Member Functions inherited from operations_research::MPSolverInterface
void	ExtractModel ()
	Extracts model stored in MPSolver.

void	ResetExtractionInformation ()
	Resets the extraction information.

void	InvalidateSolutionSynchronization ()

void	SetCommonParameters (const MPSolverParameters &param)
	Sets parameters common to LP and MIP in the underlying solver.

void	SetMIPParameters (const MPSolverParameters &param)
	Sets MIP specific parameters in the underlying solver.

void	SetUnsupportedDoubleParam (MPSolverParameters::DoubleParam param)
	Sets an unsupported double parameter.

virtual void	SetUnsupportedIntegerParam (MPSolverParameters::IntegerParam param)
	Sets an unsupported integer parameter.

void	SetDoubleParamToUnsupportedValue (MPSolverParameters::DoubleParam param, double value)
	Sets a supported double parameter to an unsupported value.

virtual void	SetIntegerParamToUnsupportedValue (MPSolverParameters::IntegerParam param, int value)
	Sets a supported integer parameter to an unsupported value.

virtual absl::Status	SetNumThreads (int num_threads)
	Sets the number of threads to be used by the solver.

Protected Attributes inherited from operations_research::MPSolverInterface
MPSolver *const	solver_

SynchronizationStatus	sync_status_
	Indicates whether the model and the solution are synchronized.

MPSolver::ResultStatus	result_status_

bool	maximize_
	Optimization direction.

int	last_constraint_index_
	Index in MPSolver::variables_ of last constraint extracted.

int	last_variable_index_
	Index in MPSolver::constraints_ of last variable extracted.

double	objective_value_
	The value of the objective function.

double	best_objective_bound_
	The value of the best objective bound. Used only for MIP solvers.

bool	quiet_
	Boolean indicator for the verbosity of the solver output.

Static Protected Attributes inherited from operations_research::MPSolverInterface
static const int	kDummyVariableIndex = 0
	-------— MPSolverInterface -------—

Detailed Description

Definition at line 37 of file glop_interface.cc.

Constructor & Destructor Documentation

◆ GLOPInterface()

operations_research::GLOPInterface::GLOPInterface ( MPSolver * solver )

explicit

Definition at line 105 of file glop_interface.cc.

◆ ~GLOPInterface()

operations_research::GLOPInterface::~GLOPInterface ( )

override

Definition at line 114 of file glop_interface.cc.

Member Function Documentation

◆ AddRowConstraint()

void operations_research::GLOPInterface::AddRowConstraint ( MPConstraint * ct )

overridevirtual

Adds a linear constraint.

Implements operations_research::MPSolverInterface.

Definition at line 213 of file glop_interface.cc.

◆ AddVariable()

void operations_research::GLOPInterface::AddVariable ( MPVariable * var )

overridevirtual

Add a variable.

Implements operations_research::MPSolverInterface.

Definition at line 217 of file glop_interface.cc.

◆ ClearConstraint()

void operations_research::GLOPInterface::ClearConstraint ( MPConstraint * constraint )

overridevirtual

Clears a constraint from all its terms.

Implements operations_research::MPSolverInterface.

Definition at line 227 of file glop_interface.cc.

◆ ClearObjective()

void operations_research::GLOPInterface::ClearObjective ( )

overridevirtual

Clears the objective from all its terms.

Implements operations_research::MPSolverInterface.

Definition at line 238 of file glop_interface.cc.

◆ column_status()

MPSolver::BasisStatus operations_research::GLOPInterface::column_status ( int variable_index ) const

overridevirtual

Returns the basis status of a constraint.

Implements operations_research::MPSolverInterface.

Definition at line 253 of file glop_interface.cc.

◆ ExtractNewConstraints()

void operations_research::GLOPInterface::ExtractNewConstraints ( )

overridevirtual

Extracts the constraints that have not been extracted yet.

Implements operations_research::MPSolverInterface.

Definition at line 283 of file glop_interface.cc.

◆ ExtractNewVariables()

void operations_research::GLOPInterface::ExtractNewVariables ( )

overridevirtual

Extracts the variables that have not been extracted yet.

Implements operations_research::MPSolverInterface.

Definition at line 269 of file glop_interface.cc.

◆ ExtractObjective()

void operations_research::GLOPInterface::ExtractObjective ( )

overridevirtual

Extracts the objective.

Implements operations_research::MPSolverInterface.

Definition at line 307 of file glop_interface.cc.

◆ InterruptSolve()

bool operations_research::GLOPInterface::InterruptSolve ( )

overridevirtual

Reimplemented from operations_research::MPSolverInterface.

Definition at line 186 of file glop_interface.cc.

◆ IsContinuous()

bool operations_research::GLOPInterface::IsContinuous ( ) const

overridevirtual

--— Misc --—

Implements operations_research::MPSolverInterface.

Definition at line 257 of file glop_interface.cc.

◆ IsLP()

bool operations_research::GLOPInterface::IsLP ( ) const

overridevirtual

Returns true if the problem is continuous and linear.

Implements operations_research::MPSolverInterface.

Definition at line 259 of file glop_interface.cc.

◆ IsMIP()

bool operations_research::GLOPInterface::IsMIP ( ) const

overridevirtual

Returns true if the problem is discrete and linear.

Implements operations_research::MPSolverInterface.

Definition at line 261 of file glop_interface.cc.

◆ iterations()

int64_t operations_research::GLOPInterface::iterations ( ) const

overridevirtual

---— Query statistics on the solution and the solve ---—

Implements operations_research::MPSolverInterface.

Definition at line 240 of file glop_interface.cc.

◆ nodes()

int64_t operations_research::GLOPInterface::nodes ( ) const

overridevirtual

Returns the number of branch-and-bound nodes. The problem must be discrete, otherwise it crashes, or returns kUnknownNumberOfNodes in NDEBUG mode.

Implements operations_research::MPSolverInterface.

Definition at line 244 of file glop_interface.cc.

◆ Reset()

void operations_research::GLOPInterface::Reset ( )

overridevirtual

--— Model modifications and extraction --—

Ignore any incremental info for the next solve. Note that the parameters will not be reset as we re-read them on each Solve().

Implements operations_research::MPSolverInterface.

Definition at line 191 of file glop_interface.cc.

◆ row_status()

MPSolver::BasisStatus operations_research::GLOPInterface::row_status ( int constraint_index ) const

overridevirtual

Returns the basis status of a row.

Implements operations_research::MPSolverInterface.

Definition at line 249 of file glop_interface.cc.

◆ SetCoefficient()

void operations_research::GLOPInterface::SetCoefficient	(	MPConstraint *	constraint,
		const MPVariable *	variable,
		double	new_value,
		double	old_value )

overridevirtual

Changes a coefficient in a constraint.

Implements operations_research::MPSolverInterface.

Definition at line 221 of file glop_interface.cc.

◆ SetConstraintBounds()

void operations_research::GLOPInterface::SetConstraintBounds	(	int	index,
		double	lb,
		double	ub )

overridevirtual

Modify bounds of an extracted variable.

Implements operations_research::MPSolverInterface.

Definition at line 209 of file glop_interface.cc.

◆ SetDualTolerance()

void operations_research::GLOPInterface::SetDualTolerance ( double value )

overridevirtual

Todo: (user): Modify parameters_ with the correct value. The problem is that this is set by default by the wrapper to 1e-7 and for now we want to use higher default tolerances in Glop.

Implements operations_research::MPSolverInterface.

Definition at line 355 of file glop_interface.cc.

◆ SetLpAlgorithm()

void operations_research::GLOPInterface::SetLpAlgorithm ( int value )

overridevirtual

Implements operations_research::MPSolverInterface.

Definition at line 394 of file glop_interface.cc.

◆ SetObjectiveCoefficient()

void operations_research::GLOPInterface::SetObjectiveCoefficient	(	const MPVariable *	variable,
		double	coefficient )

overridevirtual

Changes a coefficient in the linear objective.

Implements operations_research::MPSolverInterface.

Definition at line 231 of file glop_interface.cc.

◆ SetObjectiveOffset()

void operations_research::GLOPInterface::SetObjectiveOffset ( double value )

overridevirtual

Changes the constant term in the linear objective.

Implements operations_research::MPSolverInterface.

Definition at line 236 of file glop_interface.cc.

◆ SetOptimizationDirection()

void operations_research::GLOPInterface::SetOptimizationDirection ( bool maximize )

overridevirtual

Sets the optimization direction (min/max).

Implements operations_research::MPSolverInterface.

Definition at line 197 of file glop_interface.cc.

◆ SetParameters()

void operations_research::GLOPInterface::SetParameters ( const MPSolverParameters & param )

overridevirtual

Sets all parameters in the underlying solver.

Implements operations_research::MPSolverInterface.

Definition at line 331 of file glop_interface.cc.

◆ SetPresolveMode()

void operations_research::GLOPInterface::SetPresolveMode ( int value )

overridevirtual

Implements operations_research::MPSolverInterface.

Definition at line 364 of file glop_interface.cc.

◆ SetPrimalTolerance()

void operations_research::GLOPInterface::SetPrimalTolerance ( double value )

overridevirtual

Todo: (user): Modify parameters_ with the correct value. The problem is that this is set by default by the wrapper to 1e-7 and for now we want to use higher default tolerances in Glop.

Implements operations_research::MPSolverInterface.

Definition at line 345 of file glop_interface.cc.

◆ SetRelativeMipGap()

void operations_research::GLOPInterface::SetRelativeMipGap ( double value )

overridevirtual

Sets each parameter in the underlying solver.

Implements operations_research::MPSolverInterface.

Definition at line 338 of file glop_interface.cc.

◆ SetScalingMode()

void operations_research::GLOPInterface::SetScalingMode ( int value )

overridevirtual

Sets the scaling mode.

Implements operations_research::MPSolverInterface.

Definition at line 379 of file glop_interface.cc.

◆ SetSolverSpecificParametersAsString()

bool operations_research::GLOPInterface::SetSolverSpecificParametersAsString ( const std::string & parameters )

overridevirtual

Pass solver specific parameters in text format. The format is solver-specific and is the same as the corresponding solver configuration file format. Returns true if the operation was successful.

Default implementation returns true if the input is empty. It returns false and logs a WARNING if the input is not empty.

NOTE(user): Android build uses protocol buffers in lite mode, and parsing data from text format is not supported there. To allow solver specific parameters from string on Android, we first need to switch to non-lite version of protocol buffers.

Reimplemented from operations_research::MPSolverInterface.

Definition at line 410 of file glop_interface.cc.

◆ SetStartingLpBasis()

void operations_research::GLOPInterface::SetStartingLpBasis	(	const std::vector< MPSolver::BasisStatus > &	,
		const std::vector< MPSolver::BasisStatus > &	)

overridevirtual

See MPSolver::SetStartingLpBasis().

Reimplemented from operations_research::MPSolverInterface.

Definition at line 317 of file glop_interface.cc.

◆ SetVariableBounds()

void operations_research::GLOPInterface::SetVariableBounds	(	int	index,
		double	lb,
		double	ub )

overridevirtual

Modifies bounds of an extracted variable.

Implements operations_research::MPSolverInterface.

Definition at line 201 of file glop_interface.cc.

◆ SetVariableInteger()

void operations_research::GLOPInterface::SetVariableInteger	(	int	index,
		bool	integer )

overridevirtual

Modifies integrality of an extracted variable.

Implements operations_research::MPSolverInterface.

Definition at line 205 of file glop_interface.cc.

◆ Solve()

MPSolver::ResultStatus operations_research::GLOPInterface::Solve ( const MPSolverParameters & param )

overridevirtual

--— Solve --—

Re-extract the problem from scratch. We don't support modifying the LinearProgram in sync with changes done in the MPSolver.

Time limit.

The solution must be marked as synchronized even when no solution exists.

Implements operations_research::MPSolverInterface.

Definition at line 116 of file glop_interface.cc.

◆ SolverVersion()

std::string operations_research::GLOPInterface::SolverVersion ( ) const

overridevirtual

Returns a string describing the underlying solver and its version.

Implements operations_research::MPSolverInterface.

Definition at line 263 of file glop_interface.cc.

◆ underlying_solver()

void * operations_research::GLOPInterface::underlying_solver ( )

overridevirtual

Returns the underlying solver.

Implements operations_research::MPSolverInterface.

Definition at line 267 of file glop_interface.cc.

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

ortools/linear_solver/glop_interface.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ GLOPInterface()

◆ ~GLOPInterface()

Member Function Documentation

◆ AddRowConstraint()

◆ AddVariable()

◆ ClearConstraint()

◆ ClearObjective()

◆ column_status()

◆ ExtractNewConstraints()

◆ ExtractNewVariables()

◆ ExtractObjective()

◆ InterruptSolve()

◆ IsContinuous()

◆ IsLP()

◆ IsMIP()

◆ iterations()

◆ nodes()

◆ Reset()

◆ row_status()

◆ SetCoefficient()

◆ SetConstraintBounds()

◆ SetDualTolerance()

◆ SetLpAlgorithm()

◆ SetObjectiveCoefficient()

◆ SetObjectiveOffset()

◆ SetOptimizationDirection()

◆ SetParameters()

◆ SetPresolveMode()

◆ SetPrimalTolerance()

◆ SetRelativeMipGap()

◆ SetScalingMode()

◆ SetSolverSpecificParametersAsString()

◆ SetStartingLpBasis()

◆ SetVariableBounds()

◆ SetVariableInteger()

◆ Solve()

◆ SolverVersion()

◆ underlying_solver()