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...DEFINE A CLASS SUCH THAT IT SHOULD NOT ALLOW TO...

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Question by irin_cs
Submitted on 7/22/2003
Related FAQ: [alt.comp.lang.learn.c-c++] - FAQ list
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I WANT TO DEFINE A CLASS SUCH THAT IT SHOULD NOT ALLOW TO INSTANTIATE OBJECT NOT MORE THAN ONE. HOW CAN I DO IT?


Answer by amitxlnc
Submitted on 8/13/2003
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You can create such a class by defining,
a member variable of type int static in the class definition.

Then you should check the value of that variable in the constructor of the class
if the value of that variable is 1, then call the destructor of the object in the constructor of that.
else create the object & increment the value of the variable.
So next time that is second instance of same
class is to be created, it will created & destroyed simultaneous.

 

Answer by David Cary
Submitted on 12/13/2003
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Have you read the article
"Using the Singleton Pattern"
by Budi Kurniawan 08/27/2003
http://www.onjava.com/pub/a/onjava/2003/08/27/singleton.html
?

You may also be interested in several other ways to implement the Singleton pattern:
http://c2.com/cgi/wiki?CppImplementingSingletonPattern

 

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