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+ 3

Should I use namespace std

I just restarted C++ (I almost finished but got really busy then forgot chunks of it) and I realized that it always tells us to use namespace std, instead of putting std:: in front of things like cout or cin. My friend (who is way more advanced than me) said to start practicing using std:: rather than using namespace because it is good practice. I couldn't really understand his explanation, something about library ambiguity I think? Should I stop using namespace std?

29th Apr 2019, 8:50 PM
Rowan - avatar
3 Antworten
+ 6
using namespace std; is helpful, but there is a problem... Let's say you are implementing your own vector. If you use `using namespace std;`, the compiler will start complaining because there is std::vector<>. * `using namespace` imports the whole namespace. If you are going to use Boost, you will need to use the prefix for the standard namespace and Boost. Forgetting that could be a huge hassle. ----- I, personally, prefer to use the prefix form because I know that it is cleaner.
29th Apr 2019, 9:53 PM
Edwin Pratt
Edwin Pratt - avatar
+ 5
For simpler programs with no clash of namespaces, using namespace std; is OK.
30th Apr 2019, 12:47 AM
Sonic - avatar
+ 2
You can use it. You should understand the theory behind it and use namespaces as needed. Do not do anything just because someone sad so, ask why - that is the way to learn.
29th Apr 2019, 8:55 PM
spotbot2k - avatar