C++ Programming - OOPS Concepts - Discussion

I can't understand concept of singleton class? let you to explain?

I can't understand concept of singleton class? please explain with example.

Whenever we a class gets loaded only one single class class object gets created for that class which is singleton for that particular class.

I don't know about singleton class..
and shouldn't it be protected class????

Can I get more info about singltone class.

A class which is having only single object is called singleton.

What is the use of singleton class? please give me simple explanation.

Singleton class has only one instance this concept given in the design pattern.

I can't understand following statement:

static A* m_objA;

And Also term Singleton & Longer class.

A Singleton class is a design pattern, which creates only a single instance at any time.

When is it required:

Based on the requirement.

Example : Singletons are often used to control access to resources such as database connections or sockets.

Suppose u have licence for only one connection for database, A singleton connection obj makes sure that only one connection can be made at any time.

How this can be implemented:

1. Have a static method, creates the instance if the instance does not exists. If the instance already there then returns the reference to the existing obj.

2. Have a private constructor.

Why Static method:

No obj is required to call static method and memory is used only when required.

private constructor is to make sure that object is not created in any other way.

I explained as per my knowledge. Hope this would be useful.