Re: extern(C++, ns)

[JohnCK via Digitalmars-d]

On Wednesday, 20 January 2016 at 16:38:19 UTC, Marc Schütz wrote:
// a.d
module a;
extern(C++, ns) {
    void fooa();
    void bar();
}

// b.d
module b;

extern(C++, ns) {
    void foob();
}
void bar();

// main.d
import a, b;

void main() {
    fooa();     // ok
    foob();     // ok
    bar();      // Error: b.bar at b.d(6) conflicts with 
a.ns.bar at a.d(5)
    // let's try to disambiguate: we want ns.bar
    ns.bar();   // Error: a.ns at a.d(3) conflicts with b.ns at 
b.d(3)
    a.ns.bar(); // works, but requires superfluous `a`, even 
though
                // `ns` already makes it unambiguous
}

I think the first error is correct:

    bar();      // Error: b.bar at b.d(6) conflicts with 
a.ns.bar at a.d(5)

So you have two functions bar() one inside 'ns' in module a and 
"outside" 'ns' in module b.

Now, the last 2 errors, Mark Schutz said:

    a.ns.bar(); // works, but requires superfluous `a`, even 
though
                // `ns` already makes it unambiguous

Question: What happens if you do this: using "ns1" in "module a" 
and "ns2" in "module b" and do:

ns1.bar();

?

Because you can't have more than one namespaces with the same 
name in C++, right?

JohnCK.