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!
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Write some ugly macros. I wouldn't put myself on that job though.Ivaylo Valchev– Ivaylo Valchev2018-12-15 11:42:51 +00:00Commented Dec 15, 2018 at 11:42
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@DeiDei Yeah, that's a horrible idea :P.πάντα ῥεῖ– πάντα ῥεῖ2018-12-15 11:58:58 +00:00Commented Dec 15, 2018 at 11:58
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2 Answers
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.
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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.
