Specifying C++ symbols in C++ namespaces

[Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>]

I am not sure what is the best option, but it should be readable 
and obvious. So I might prefer to just have "::" if possible. 
Somewhat annoying and verbose, so I am not sure about this, but 
the advantage is that it is easy to see what is C++ and what is D 
function calls.