/home/vlg/develop/libASSA/libassa/assa/Singleton.h File Reference

Singleton template class allows to turn any new or existing class T into Singleton Pattern. More...

#include "Destroyer.h"

Include dependency graph for Singleton.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Namespaces
namespace	ASSA
Classes
class	ASSA::Singleton< T >
Defines
#define	ASSA_DECL_SINGLETON(K)
	ASSA_DECL_SINGLETON macro inserts static member declarations mandated by the Singleton class.

---

Detailed Description

Singleton template class allows to turn any new or existing class T into Singleton Pattern.

It is accomplished by deriving class T from class Singleton.

It is assumed that Singleton objects are long-lived. Often they exist for the life of the program. You delete them not so much to reclaim space but to shut down in the orderly manner (such as return whatever resources derived class holds in its ownership back to the system). C++ deletes static objects automatically. Although, it doesn't guarantee the calling order. In other words, destructors of Singleton class are not order-dependent.

To force destruction order, Singleton class transfers ownership of object T to Destroyer class. When the program exits, the Destroyer will be destroyed, and the object T along with it. Singleton destructor is now implicit.

Definition in file Singleton.h.

---

Define Documentation

#define ASSA_DECL_SINGLETON (  K   )

Value: template <> K* ASSA::Singleton<K>::m_instance = NULL; \ template <class T> ASSA::Destroyer<T> ASSA::Singleton<T>::m_destroyer; \ template ASSA::Destroyer<K> ASSA::Singleton<K>::m_destroyer; ASSA_DECL_SINGLETON macro inserts static member declarations mandated by the Singleton class. 'assa-genesis' utility generates appropriate file templated by default. Definition at line 82 of file Singleton.h.

---