GEO::Factory< FactoryCreator > Class Template Reference

Factory of typed objects. More...

#include <geogram/basic/factory.h>

Inheritance diagram for GEO::Factory< FactoryCreator >:

Classes
struct	RegisterCreator
	Helper class to register a creator. More...

Public Types
typedef FactoryCreator::CreatorType	CreatorType

Static Public Member Functions
template<class ConcreteType >
static void	register_creator (const std::string &name)
	Registers a creator. More...
static CreatorType	find_creator (const std::string &name)
	Finds a creator by name. More...
static void	list_creators (std::vector< std::string > &names)
	Lists all registered creators. More...
static bool	has_creator (const std::string &name)
	Tests whether the factory has a creator. More...
Static Public Member Functions inherited from GEO::Counted
static void	ref (const Counted *counted)
	Increments the reference count. More...
static void	unref (const Counted *counted)
	Decrements the reference count. More...

Protected Member Functions
	~Factory () override
	Factory destructor.
Protected Member Functions inherited from GEO::Counted
	Counted ()
	Creates a reference counted object. More...
virtual	~Counted ()
	Destroys a reference counted object. More...

Additional Inherited Members
Public Member Functions inherited from GEO::Counted
void	ref () const
	Increments the reference count. More...
void	unref () const
	Decrements the reference count. More...
bool	is_shared () const
	Check if the object is shared. More...
int	nb_refs () const
	Gets the number of references that point to this object. More...

Detailed Description

template<class FactoryCreator>
class GEO::Factory< FactoryCreator >

Factory of typed objects.

A Factory is a mechanism to create objects without knowing their types in advance. The object types that a Factory can instantiate belong to a type hierarchy whose base type is defined by Type. The Factory uses a registry of creator functions bound to user-defined names. The user-defined names can be used to:

• register a creator function (see register_creator())
• create an object, using the creator function bound to the name (see create_object())

  Template Parameters

  FactoryCreator

  the type of the creator used to create objects in this Factory. FactoryCreator must define:

• the type CreatorType type of the creation function
• a static template function create(...) used to actually create objects of a given concrete type

Definition at line 137 of file factory.h.

Member Function Documentation

find_creator()

template<class FactoryCreator >

static CreatorType GEO::Factory< FactoryCreator >::find_creator ( const std::string &  name )

inlinestatic

Finds a creator by name.

Parameters

[in]

name

a user-defined name identifying a creator in the Factory

Return values

the	creator associated to name if name exists
null	pointer otherwise

Definition at line 171 of file factory.h.

has_creator()

template<class FactoryCreator >

static bool GEO::Factory< FactoryCreator >::has_creator ( const std::string &  name )

inlinestatic

Tests whether the factory has a creator.

Parameters

[in]

name

name of the creator

Return values

true	if creator name is registered in the factory
false	otherwise

Definition at line 196 of file factory.h.

list_creators()

template<class FactoryCreator >

static void GEO::Factory< FactoryCreator >::list_creators ( std::vector< std::string > &  names )

inlinestatic

Lists all registered creators.

This stores the names of the registered creators to output vector names.

Parameters

[out]

names

output list of registered names

Definition at line 183 of file factory.h.

register_creator()

template<class FactoryCreator >

template<class ConcreteType >

static void GEO::Factory< FactoryCreator >::register_creator ( const std::string &  name )

inlinestatic

Registers a creator.

This creates a new creator for objects of type ConcreteType and registers it with the user-defined name name.

Parameters

[in]

name

name of the ConcreteType creator in the Factory

Template Parameters

ConcreteType

the type of the objects to create

Usage example:

struct MyBaseClass { ... };
typedef Factory<MyBaseClass> MyFactory;
 
struct MyDerivedClass : MyBaseClass { ... };
MyFactory::register_creator<MyDerivedClass>("my_derived_class");

See also

RegisterCreator()

Definition at line 158 of file factory.h.

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

• geogram/basic/factory.h