extern(C++, ns)

[NX via Digitalmars-d]

On Wednesday, 13 January 2016 at 10:53:06 UTC, Ola Fosheim 
Grøstad wrote:
> Next version of C++ will probably allow this:
>
> namespace a::b::c::d::e {
>    ...
> }

Current version of D2 allow this:

module a.b.c.d.e;