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
Couldn't you work around that by compiling your D code with GDC/MinGW and the C++ code with MinGW?
