Implements a branching rule for modifying the lower and the upper bound of a variable. More...

#include <ogdf/lib/abacus/boundbranchrule.h>

Inheritance diagram for abacus::BoundBranchRule:

Public Member Functions
	BoundBranchRule (Master *master, int variable, double lBound, double uBound)
	Creates a bound branch rule for given branching variable, lower bound lBound and upper bound uBound.

virtual	~BoundBranchRule ()

virtual void	extract (LpSub *lp)
	Pverloaded to modify directly the linear programming relaxation.

virtual int	extract (Sub *sub)
	Modifies a subproblem by changing the lower and the upper bound of the branching variable.

double	lBound () const
	Returns the lower bound of the branching variable.

double	uBound () const
	Returns the upper bound of the branching variable.

virtual void	unExtract (LpSub *lp)
	Should undo the modifictions of the linear programming relaxtion \|lp\|.

int	variable () const
	Returns the number of the branching variable.

Public Member Functions inherited from abacus::BranchRule
	BranchRule (Master *master)
	Initializes a branching rule.

virtual	~BranchRule ()

virtual bool	branchOnSetVar ()
	Should indicate if the branching is performed by setting a binary variable.

virtual void	initialize (Sub *sub)
	Called from the constructor of a subproblem.

Public Member Functions inherited from abacus::AbacusRoot
virtual	~AbacusRoot ()
	The destructor.

Private Attributes
double	lBound_
	The lower bound of the branching variable.

double	oldLpLBound_

double	oldLpUBound_

double	uBound_
	The upper bound of the branching variable.

int	variable_
	The branching variable.

Friends
std::ostream &	operator<< (std::ostream &out, const BoundBranchRule &rhs)
	Output operator for bound branch rules.

Additional Inherited Members
Static Public Member Functions inherited from abacus::AbacusRoot
static bool	ascii2bool (const string &str)
	Converts the string str to a boolean value.

static bool	endsWith (const string &str, const string &end)
	Returns true if str ends with end, false otherwise.

static double	fracPart (double x)
	Returns the absolute value of the fractional part of x.

static const char *	onOff (bool value)
	Converts a boolean variable to the strings "on" and "off".

Protected Attributes inherited from abacus::BranchRule
Master *	master_
	A pointer to the corresponding master of the optimization.

Detailed Description

Implements a branching rule for modifying the lower and the upper bound of a variable.

Definition at line 41 of file boundbranchrule.h.

Constructor & Destructor Documentation

◆ BoundBranchRule()

abacus::BoundBranchRule::BoundBranchRule	(	Master *	master,
		int	variable,
		double	lBound,
		double	uBound
	)

inline

Creates a bound branch rule for given branching variable, lower bound lBound and upper bound uBound.

Parameters

master	A pointer to the corresponding master of the optimization.
variable	The branching variable.
lBound	The lower bound of the branching variable.
uBound	The upper bound of the branching variable.

Definition at line 51 of file boundbranchrule.h.

◆ ~BoundBranchRule()

virtual abacus::BoundBranchRule::~BoundBranchRule ( )

inlinevirtual

Definition at line 59 of file boundbranchrule.h.

Member Function Documentation

◆ extract() [1/2]

virtual void abacus::BoundBranchRule::extract ( LpSub * lp )

inlinevirtual

Pverloaded to modify directly the linear programming relaxation.

This required to evaluate the quality of a branching rule.

Reimplemented from abacus::BranchRule.

Definition at line 95 of file boundbranchrule.h.

◆ extract() [2/2]

virtual int abacus::BoundBranchRule::extract ( Sub * sub )

inlinevirtual

Modifies a subproblem by changing the lower and the upper bound of the branching variable.

Parameters

sub	The subproblem being modified.

Returns: 0 If the subproblem is successfully modified.; 1 If the modification causes a contradiction.

Implements abacus::BranchRule.

Definition at line 80 of file boundbranchrule.h.

◆ lBound()

double abacus::BoundBranchRule::lBound ( ) const

inline

Returns the lower bound of the branching variable.

Definition at line 116 of file boundbranchrule.h.

◆ uBound()

double abacus::BoundBranchRule::uBound ( ) const

inline

Returns the upper bound of the branching variable.

Definition at line 121 of file boundbranchrule.h.

◆ unExtract()

virtual void abacus::BoundBranchRule::unExtract ( LpSub * lp )

inlinevirtual

Should undo the modifictions of the linear programming relaxtion |lp|.

This function has to be redefined in a derived class if extract(LpSub*) is redefined there.

Parameters

lp	A pointer to a the linear programming relaxtion of a subproblem.

Reimplemented from abacus::BranchRule.

Definition at line 104 of file boundbranchrule.h.

◆ variable()

int abacus::BoundBranchRule::variable ( ) const

inline

Returns the number of the branching variable.

Definition at line 111 of file boundbranchrule.h.

Friends And Related Symbol Documentation

◆ operator<<

std::ostream & operator<<	(	std::ostream &	out,
		const BoundBranchRule &	rhs
	)

friend

Output operator for bound branch rules.

Writes the branching variable together with its lower and upper bound to an output stream.

Parameters

out	The output stream.
rhs	The branch rule being output.

Returns: A reference to the output stream.

Definition at line 134 of file boundbranchrule.h.

Member Data Documentation

◆ lBound_

double abacus::BoundBranchRule::lBound_

private

The lower bound of the branching variable.

Definition at line 127 of file boundbranchrule.h.

◆ oldLpLBound_

double abacus::BoundBranchRule::oldLpLBound_

private

Definition at line 129 of file boundbranchrule.h.

◆ oldLpUBound_

double abacus::BoundBranchRule::oldLpUBound_

private

Definition at line 130 of file boundbranchrule.h.

◆ uBound_

double abacus::BoundBranchRule::uBound_

private

The upper bound of the branching variable.

Definition at line 128 of file boundbranchrule.h.

◆ variable_

int abacus::BoundBranchRule::variable_

private

The branching variable.

Definition at line 126 of file boundbranchrule.h.

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

include/ogdf/lib/abacus/boundbranchrule.h

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Public Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BoundBranchRule()

◆ ~BoundBranchRule()

Member Function Documentation

◆ extract() [1/2]

◆ extract() [2/2]

◆ lBound()

◆ uBound()

◆ unExtract()

◆ variable()

Friends And Related Symbol Documentation

◆ operator<<

Member Data Documentation

◆ lBound_

◆ oldLpLBound_

◆ oldLpUBound_

◆ uBound_

◆ variable_

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