RWTSingleton< T > Class Template Reference

Ensures that a class has only one instance and provides a global point of access to it. More...

#include <rw/pointer/RWTSingleton.h>

Static Public Member Functions
static RWTCountingPointer< T, RWAtomicCounter > &	instance ()

Protected Member Functions
	RWTSingleton ()

Static Protected Member Functions
static RWTCountingPointer< T, RWAtomicCounter > &	get ()

Detailed Description

template<class T>
class RWTSingleton< T >

RWTSingleton ensures that a class has only one instance, and provides a global point of access to it. This is an Object Creational pattern. For more information, see Design Patterns by Gamma, Helm, Johnson, and Vlissides.

Example

#include <rw/pointer/RWTSingleton.h>
#include <iostream>
 
class Foo {
 public:
  void function() { std::cout << "I'm a foo example" << std::endl; }
};
 
RWTCountingPointer<Foo> singleFooPtr = RWTSingleton<Foo>::instance();
 
int main(void) {
  singleFooPtr->function();
  return 0;
}

Constructor & Destructor Documentation

RWTSingleton()

template<class T >

RWTSingleton< T >::RWTSingleton ( )

inlineprotected

The constructor is protected to ensure that only one instance can ever get created.

Member Function Documentation

get()

template<class T >

static RWTCountingPointer< T, RWAtomicCounter > & RWTSingleton< T >::get ( )

inlinestaticprotected

Protected accessor function that gives access to the class state. Inherited classes use this function.

instance()

template<class T >

static RWTCountingPointer< T, RWAtomicCounter > & RWTSingleton< T >::instance ( )

inlinestatic

Creates and returns the instance of T, if it has not already been created.