2) Is there a way to start adding D code to a C++ projects?
Yes. You'll need to expose parts of the D code as extern(C) or
extern(C++) to interface with it, and remember to initialize
the D runtime.
As he apparently is on Windows, you can only do this with a D
DLL, which are likely to be a PITA (but at least they should work
unlike on un*x); you can't really link D object files and C/C++
object files together, as on win32 OMF is used (you could use
unilink, but that's so obscure I wouldn't expect a newbie to mess
with this at all). So I'd take this as "no"
