Calling D from C++

[Johann MacDonagh]

On 7/18/2011 10:40 PM, Andrej Mitrovic wrote:
> You have several problems.
>
> extern(C++) only specifies the calling convention, not the visibility
> of the symbol. To export the symbol, list it in a .def file or mark
> the function with export in the module itself, ala:
>
> export extern(C++) void SetInt(int * foo) {}

If you export it like this, it will be exported as the C++ mangled name. 
If you have extern(C) it will be cdecl "_SetInt" and extern(Windows) 
will be stdcall "_SetInt at 4".

> I don't know why, but if you use a .def file instead of `export` the
> function will be exported as a C function with no name mangling.

If you look at dumpbin /exports you'll see something like this:

     ordinal hint RVA      name

           1    0 0000306C SetInt = ?SetInt@@YAXPAH at Z (void __cdecl 
SetInt(int *))

So the symbol still has C++ name mangling but its exported as whatever 
name you want.