Why is "using namespace std" not recommended in a header file in C++?

Asked Jan 10 '11 at 16:29

Active Jan 10 '11 at 16:33

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Why is 'using namespace std;' considered a bad practice in C++?

I have read many times that even if using namespace std in header file is legal, it can have catastrophic consequences. Perhaps I don't understand what using namespace std is. Thank you.

edited May 23 '17 at 12:26

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asked Jan 10 '11 at 16:29

JohnG

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Dupe of: http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-a-bad-practice-in-c – badgerr Jan 10 '11 at 16:31
Asked and answered many, many times. – John Dibling Jan 10 '11 at 16:34
It's not considered good practice even other than in a headerfile. See here: http://stackoverflow.com/questions/1265039/using-std-namespace – CB Bailey Jan 10 '11 at 16:37

Why is "using namespace std" not recommended in a header file in C++?

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