extern(C++, ns)

[Carl Sturtivant via Digitalmars-d]

On Thursday, 21 January 2016 at 00:43:13 UTC, David Nadlinger 
wrote:
> If you want to split up the interface to a C++ namespace among 
> different modules, then the different symbols will *always* 
> reside in different fully qualified scopes – with or without 
> additional scopes being introduced by extern(C++)!

This is the nub of the problem, and it's been stated by several 
people in several different ways in this thread.

It means that a C++ namespace which is a single scope, is mapped 
into one scope per module in D. The C++ namespace scope has been 
fragmented to make it consistent with D's module philosophy. The 
result is natural neither for C++ nor for D.