Singleton Object Management
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This is from my series of presentations on C++ and Design Pattern. This was first presented at Interra in 2005.
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Name : Prasoon Dadhich
USN : 1MS09IS069
CODE
#include <iostream>
using namespace std;
class Singleton
{
private:
static bool instanceFlag;
static Singleton *single;
Singleton()
{
//private constructor
}
public:
static Singleton* getInstance();
void method();
~Singleton()
{
instanceFlag = false;
}
};
bool Singleton::instanceFlag = false;
Singleton* Singleton::single = NULL;
Singleton* Singleton::getInstance()
{
if(! instanceFlag)
{
single = new Singleton();
instanceFlag = true;
return single;
}
else
{
return single;
}
}
void Singleton::method()
{
cout << "Method of the singleton class" << endl;
}
int main()
{
Singleton *sc1,*sc2;
sc1 = Singleton::getInstance();
sc1->method();
sc2 = Singleton::getInstance();
sc2->method();
return 0;
}
Explanation
If we create any object of this class then the static object (player) will be returned and assigned to the new object.
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variable is of type Dictionary. It serves as a lookup table to match an account type with a
particular prefix. It is initialized (code is given in the appendix) at declaration. Properties: There
are two properties, both of which are computed.
Assignment 4, Winter 2022 Uses - Inheritance, Interfaces, Exceptions, EventHandlers,
Collections Op.
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Singleton Object Management
- 1. November 7, 2005 Singleton Object Management Dr. Partha Pratim Das Interra Systems (India) Pvt. Ltd. Resource Management Series
- 13. Static Object Lifetime An Example
- 18. Output: VC 6.0
- 19. Output: VC 7.1
- 20. Singleton Objects What and Why
- 34. Meyer’s Singleton with Dead Reference Detection
- 38. Singletons in C++ References & Credits
- 42. Thank You