It has nothing to do with performance, but it has to do with conflict. Think of the following:
There are two libraries A and B.
Let's say A has only func1() and B has only func2().
Since there are no overlapping functions, in this case,
using namespace foo;
using namespace bar;
You can use . It's going to work.
But if one day foo is upgraded and func2() is added,
using namespace foo;
using namespace bar;
In , a collision is caused by func2().
therefore
foo::func2()
bar::func2()
in conjunction with
If you specify namespace, there will be no conflict
Using namespace... is not recommended.
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