Constraint for edges, e.g., subtour elimination constraints of size 2 ((G)SEC2) More...

#include <ogdf/graphalg/MinSteinerTreeDirectedCut.h>

Inheritance diagram for ogdf::MinSteinerTreeDirectedCut< T >::EdgeConstraint:

Public Member Functions
	EdgeConstraint (abacus::Master *master, edge e1, edge e2, int factor=1.0, abacus::CSense::SENSE sense=abacus::CSense::Less, double rhs=1.0)

double	coeff (const abacus::Variable *v) const override
	coefficient of variable in constraint

Public Member Functions inherited from abacus::Constraint
	Constraint (const Constraint &rhs)
	Copy constructor.

	Constraint (Master *master)
	Initializes an empty constraint.

	Constraint (Master master, const Sub sub, CSense::SENSE sense, double rhs, bool dynamic, bool local, bool liftable)
	Initializes a constraint.

virtual	~Constraint ()

ConClass *	classification (Active< Variable, Constraint > *var=nullptr) const
	Returns a pointer to the classification of the constraint.

virtual double	distance (double x, Active< Variable, Constraint > actVar) const
	Returns the Euclidean distance of x associated with variable set actVar to the hyperplane induced by the constraint.

virtual int	genRow (Active< Variable, Constraint > *var, Row &row) const
	Generates the row format of the constraint associated with the variable set var.

bool	liftable () const
	Checks if the constraint is liftable.

void	printRow (std::ostream &out, Active< Variable, Constraint > *var) const
	Writes the row format of the constraint associated with the variable set var to output stream out.

virtual double	rhs () const
	Returns the right hand side of the constraint.

CSense *	sense ()
	Returns a pointer to the sense of the constraint.

const CSense *	sense () const
	Returns a const pointer to the sense of the constraint.

virtual double	slack (Active< Variable, Constraint > variables, double x) const
	Computes the slack of the vector x associated with the variable set variables.

virtual bool	valid (Sub *sub) const
	Checks if the constraint is valid for the subproblem sub.

virtual bool	violated (Active< Variable, Constraint > variables, double x, double *sl=nullptr) const
	Checks if a constraint is violated by a vector x associated with a variable set.

virtual bool	violated (double slack) const
	Checks if a constraint is violated given the slack of a vector.

Public Member Functions inherited from abacus::ConVar
	ConVar (Master master, const Sub sub, bool dynamic, bool local)
	Creates an instance of type ConVar.

virtual	~ConVar ()

bool	active () const
	Checks if the constraint/variable is active in at least one active subproblem.

virtual bool	dynamic () const
	Return true if the constraint/variable is dynamic.

virtual bool	equal (const ConVar *cv) const
	Should compare if the constraint/variable is identical (in a mathematical sense) with the constraint/variable cv.

bool	global () const
	Returns true if the constraint/variable is globally valid, false otherwise.

virtual unsigned	hashKey () const
	Should provide a key for the constraint/variable that can be used to insert it into a hash table.

bool	local () const
	Returns true if the constraint/variable is only locally valid, false otherwise.

virtual const char *	name () const
	Should return the name of the constraint/variable.

virtual void	print (std::ostream &out) const
	Writes the constraint/variable to the output stream out.

virtual double	rank () const
	The function should return a rank associated with the constraint/variable.

const Sub *	sub () const
	Returns a const pointer to the subproblem associated with the constraint/variable.

void	sub (Sub *sub)
	Associates a new subproblem with the constraint/variable.

bool	expanded () const
	Returns true if the expanded format of a constraint/variable is available, false otherwise.

virtual void	expand () const
	Expands a constraint/variable.

virtual void	compress () const
	Compresses a constraint/variable.

virtual bool	deletable () const
	Returns true if the constraint/variable can be destructed.

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

Private Attributes
edge	m_e1
	base edge and twin of m_e2, i.e., if m_e1 = (u,v) it holds m_e2 = (v,u)

edge	m_e2
	twin of m_e1, i.e., if m_e1 = (u,v) it holds m_e2 = (v,u)

int	m_factor
	factor for edge coefficients in the constraint

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 Member Functions inherited from abacus::Constraint
virtual ConClass *	classify (Active< Variable, Constraint > *var) const
	The default implementation returns a 0 pointer.

virtual InfeasCon::INFEAS	voidLhsViolated (double newRhs) const
	Can be called if after variable elimination the left hand side of the constraint has become void and the right hand side has been adapted to newRhs.

Protected Attributes inherited from abacus::Constraint
ConClass *	conClass_

bool	liftable_
	This member is true if also coefficients of variables which have been inactive at generation time can be computed, false otherwise.

double	rhs_
	The right hand side of the constraint.

CSense	sense_
	The sense of the constraint.

Protected Attributes inherited from abacus::ConVar
bool	dynamic_
	If this member is true then the constraint/variable can be also removed from the active formulation after it is added the first time.

bool	expanded_
	true, if expanded version of constraint/variables available.

bool	local_
	true if the constraint/variable is only locally valid

Master *	master_
	A pointer to the corresponding master of the optimization.

int	nActive_
	The number of active subproblems of which the constraint/variable belongs to the set of active constraints/variables.

int	nLocks_
	The number of locks which have been set on the constraint/variable.

int	nReferences_
	The number of references to the pool slot the constraint is stored in.

const Sub *	sub_
	A pointer to the subproblem associated with the constraint/variable.

Detailed Description

template<typename T>
class ogdf::MinSteinerTreeDirectedCut< T >::EdgeConstraint

Constraint for edges, e.g., subtour elimination constraints of size 2 ((G)SEC2)

Definition at line 771 of file MinSteinerTreeDirectedCut.h.

Constructor & Destructor Documentation

◆ EdgeConstraint()

template<typename T >

ogdf::MinSteinerTreeDirectedCut< T >::EdgeConstraint::EdgeConstraint	(	abacus::Master *	master,
		edge	e1,
		edge	e2,
		int	factor = `1.0`,
		abacus::CSense::SENSE	sense = `abacus::CSense::Less`,
		double	rhs = `1.0`
	)