Detailed Description

A Demon is the base element of a propagation queue. It is the main object responsible for implementing the actual propagation of the constraint and pruning the inconsistent values in the domains of the variables. The main concept is that demons are listeners that are attached to the variables and listen to their modifications. There are two methods:

Run() is the actual method called when the demon is processed.
priority() returns its priority. Standard priorities are slow, normal or fast. "immediate" is reserved for variables and is treated separately.

Definition at line 3636 of file constraint_solver.h.

#include <constraint_solver.h>

Inheritance diagram for operations_research::Demon:

Public Member Functions
	Demon ()
	Demon (const Demon &)=delete
Demon &	operator= (const Demon &)=delete
	~Demon () override
virtual void	Run (Solver *s)=0
	This is the main callback of the demon.
virtual Solver::DemonPriority	priority () const
std::string	DebugString () const override
void	inhibit (Solver *s)
void	desinhibit (Solver *s)
	This method un-inhibits the demon that was previously inhibited.
Public Member Functions inherited from operations_research::BaseObject
	BaseObject ()
	BaseObject (const BaseObject &)=delete
BaseObject &	operator= (const BaseObject &)=delete
virtual	~BaseObject ()=default

Friends
class	Queue

Constructor & Destructor Documentation

◆ Demon() [1/2]

operations_research::Demon::Demon ( )

inline

This indicates the priority of a demon. Immediate demons are treated separately and corresponds to variables.

Definition at line 3640 of file constraint_solver.h.

◆ Demon() [2/2]

operations_research::Demon::Demon ( const Demon & )

delete

◆ ~Demon()

operations_research::Demon::~Demon ( )

inlineoverride

Definition at line 3647 of file constraint_solver.h.

Member Function Documentation

◆ DebugString()

std::string operations_research::Demon::DebugString ( ) const

overridevirtual

Reimplemented from operations_research::BaseObject.

Definition at line 206 of file constraint_solver.cc.

◆ desinhibit()

void operations_research::Demon::desinhibit ( Solver * s )

This method un-inhibits the demon that was previously inhibited.

Definition at line 214 of file constraint_solver.cc.

◆ inhibit()

void operations_research::Demon::inhibit ( Solver * s )

This method inhibits the demon in the search tree below the current position.

Definition at line 208 of file constraint_solver.cc.

◆ operator=()

Demon & operations_research::Demon::operator= ( const Demon & )

delete

◆ priority()

Solver::DemonPriority operations_research::Demon::priority ( ) const

virtual

This method returns the priority of the demon. Usually a demon is fast, slow or normal. Immediate demons are reserved for internal use to maintain variables.

Reimplemented in operations_research::DelayedCallMethod0< T >, operations_research::DelayedCallMethod1< T, P >, and operations_research::DelayedCallMethod2< T, P, Q >.

Definition at line 202 of file constraint_solver.cc.

◆ Run()

virtual void operations_research::Demon::Run ( Solver * s )

pure virtual

This is the main callback of the demon.

Implemented in operations_research::CallMethod0< T >, operations_research::CallMethod1< T, P >, operations_research::CallMethod2< T, P, Q >, operations_research::CallMethod3< T, P, Q, R >, operations_research::DelayedCallMethod0< T >, operations_research::DelayedCallMethod1< T, P >, and operations_research::DelayedCallMethod2< T, P, Q >.

◆ Queue

friend class Queue

friend

Definition at line 3667 of file constraint_solver.h.

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

ortools/constraint_solver/constraint_solver.h
ortools/constraint_solver/constraint_solver.cc