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agm_ultimatex

quick question about std - efficiency

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I remember reading/hearing somewhere here that the line using namespace std; is best avoided, and its better to use std::cout, std::string, etc. Is this true? and if so, would you be able to explain? Thanks.

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It has nothing to do with efficiency. You should never use a using directive or declaration in a header since that can change the meaning of subsequent code; however putting using namespace std in a source file after the headers is fine.

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Quote:
Original post by agm_ultimatex
I remember reading/hearing somewhere here that the line using namespace std; is best avoided, and its better to use std::cout, std::string, etc. Is this true? and if so, would you be able to explain? Thanks.
Using default namespaces makes for somewhat less readable code, in some people's estimation. It's not a question of efficiency, just cleanliness and readability. I don't subscribe to this notion for any language except C++; C++ needs all the help it can get to remain readable and clean.

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