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I searched but I could not find related question. Please correct me if I'm wrong.

In my project I use the following:

using namespace std;
using namespace sf;

I want it to be like below.

using namespace std, sf;

Thanks in advance!

uv_
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2 Answers2

8

This syntax is not supported, so you'll have to keep declaring multiple using statements.

In general, though, it's considered best practice to avoid declaring using namespace at all - definitely not in headers, and preferably in the inner-most scope possible (as to not pollute too much scope with unwanted symbols.

uv_
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3

I want it to be like below.

using namespace std, sf;

The syntax you're after is simply not supported by the current c++ standard.

Besides it is discouraged to import whole namespaces (at least not in header files), you may sent a request to the c++ standards committee, and see if they like to support that.

The general advice is that you should only

  • either specify exact classes you're using in your translation unit (to save typing) like using std::cout = co;
  • or to make everything clear by explicitly using fully qualified identifiers everywhere like std::cout, std::endl, etc.

The latter way is the most readable and best IMO.

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