Is this a namespace collusion?

[ninja01]

Consider the example below:

namespace ns1
{
    void func(void){ std::cout << "I am inside ns1" << std::endl; }
}

namespace ns2
{
    void func(void){ std::cout << "I am inside ns2" << std::endl; }
}

using ns1::func;
using ns2::func;

int main()
{
    func();// Error: call of overloaded func()

    return 0;
}

Can this be qualified as a "namespace collusion"?

Thanks for reading.

[George P]

That is an example of name clashing.

Forget having those using directives, fully qualify the use of whichever function you want to use.

#include <iostream>

// stores all the combat classes, functions and variables
namespace Combat
{
   void Fire()
   {
      std::cout << "You fire your crossbow.\n";
   }
}

// stores all the exploration classes, functions and variables
namespace Exploration
{
   void Fire()
   {
      std::cout << "You light your torch.\n";
   }
}

int main()
{
   Combat::Fire();
   Exploration::Fire();
}

You fire your crossbow.
You light your torch.

[ninja01]

Thank you @George for your reply, this example is just an extraction piece of noobs' question topic, I read about the side effect of using using namesapce std, and using std::cout; from various topics in the web, and I encounter a lot of terms that I never heard of, one of them is namespace collusion.

I am planing from yesterday on! to explicitly writing namespace like you do in your example.
But here I am looking whether my code is an example of what is called namespace collusion?

[George P]

I understand wanting to see what breaks C++ when doing things that are not a good idea. I do that myself a lot. I learn from doing stupid things, banging my head on the table repeatedly makes sure the knowledge doesn't fall out.

[ninja01]

banging my head on the table repeatedly makes sure the knowledge doesn't fall out.

Funny and good one.

I still would like if my code above is what it is called technically namespace collision, or just a naming collision, or naming clashing.

I mean have you ever hear about the phrase "namespace collision" or someone invented it, or word It

[coder777]

It's not 'namespace collision'. That term doesn't make too much sense. A namespace can be used several times. So it is rather namespace collision. See this article:

https://www.learncpp.com/cpp-tutorial/naming-collisions-and-an-introduction-to-namespaces/

[Peter87]

The function names are colliding/clashing in the global namespace.

I think a "namespace collision" would be if you for example tried to use two libraries that happen to use the same namespace name.

[George P]

https://heimduo.org/what-is-a-namespace-collision/

Geared more towards Java than C++, though it does mention namespaces in C++ are "similar" to those in Java.