Can anyone tell me the practical reason why istream, ostream and iostream classes have made there objects uncopyable by making copy constructors and assignment operator private.
Or in general cases when would we don't want to allow users to copy.

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Gravitation is not responsible for people falling in love.
-Albert Einstein

can anyone please look into this

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Gravitation is not responsible for people falling in love.
-Albert Einstein

It's your job to "look into" this. Our job is to answer if we know it, not do research for you.

Please refer to Guideline #7...

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Please read http://www.gidforums.com/t-5566.html. They were written to help you create a request that is readable and has enough information we can actually tell what you need help with.

well the iostream objects refer to hardware resources, such as the screen or files on the disk. if two objects referred to the same resource, race conditions could easily be created. This is just my guess of what is going on, but it sounds plausible (to me). Someone feel free to correct me if I'm wrong.

Sounds a good reason to me too

__________________
Gravitation is not responsible for people falling in love.
-Albert Einstein