RWTSingleton< T > Class Template Reference
[Smart Pointers]

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

#include <rw/pointer/RWTSingleton.h>

List of all members.

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

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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.

Examples

 #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;
 }

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Constructor & Destructor Documentation

template<class T>

RWTSingleton< T >::RWTSingleton

(

)

[inline, protected]

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

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Member Function Documentation

template<class T>

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

(

void

)

[inline, static, protected]

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

template<class T>

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

(

void

)

[inline, static]

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