C++ | Anonymous namespace colliding with namespace std

Question

#include <queue>
using namespace std;

namespace {
   class priority_queue;
}

priority_queue pq;

How can I distinguish between the two priority_queue names? I tried ::priority_queue to get the global one but to no avail.

There are reasons why `using namespace std;` is considered bad practice. You found one of them. — Thomas Sablik, Jun 20 '20 at 13:57
Does this answer your question? [Why is "using namespace std;" considered bad practice?](https://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice) — Thomas Sablik, Jun 20 '20 at 13:57

score 3 · Accepted Answer · answered Jun 20 '20 at 16:31

3

It is simple, just change

using namespace std;

to

//using namespace std;

Now you have to type std::priority_queue for the standard one and priority_queue or ::priority_queue for the custom one.

answered Jun 20 '20 at 16:31

Mestkon

1 Answers1