Re: Is there any good reason why C++ namespaces are "closed" in D?

[Atila Neves via Digitalmars-d]

On Sunday, 29 July 2018 at 07:45:35 UTC, Walter Bright wrote:
On 7/28/2018 9:23 PM, Manu wrote:
Don't troll me on this one, this is a very sensitive topic!
I could have a legit mental breakdown ;)


Here's another method:

------
extern (C++, ns) { int foo() { return 1; } }

mixin template X()
{
  extern (C++, ns) { int bar() { return 2; } }
}

mixin X!() x;

-------

void main() {
    pragma(msg, __traits(allMembers, ns));
    foo;
    bar;
}

$ dmd foo.d
tuple("foo")
foo.d(15): Error: undefined identifier bar

That method doesn't compile.


and another:

-----
extern (C++, ns) { int foo(); }

struct S
{
  extern (C++, ns) { int bar(); }
}
----

void main() {
    foo;
    bar;
}

I changed them to be only declarations, since the goal is to call 
existing C++ code, not to define it in a D file. `foo` works as 
expected, but `bar`...

foo.o:foo.d:function _Dmain: error: undefined reference to 
'S::ns::bar()'
collect2: error: ld returned 1 exit status

Neither method works.