D & C++ class question

[bauss]

On Wednesday, 28 November 2018 at 10:44:05 UTC, Nicholas Wilson 
wrote:
> On Wednesday, 28 November 2018 at 07:22:46 UTC, bauss wrote:
>> If I have a class from D.
>>
>> How would you use that class in C++?
>>
>> Like what's the correct approach to this.
>>
>> Would it work just by doing "extern(C++)" or will that only 
>> work for D to use C++ classes?
>
> If you have
>
> foo.d
> ----
> class Foo
> {
>     int aMember;
>     void aMethod() { ... };
>     final aFinalMethod() { ... };
> }
> ----
> to expose that to C++ you need to add extern(C++) too Foo and 
> use it in C++ as a Foo*
> foo.h
> ----
> class Foo
> {
>     int aMember;
>     virtual void aMethod();
>     void aFinalMethod();
> };
> ----
> If you can't/don't want to do that you can always pass it 
> around in C++ as an opaque pointer with functions that call the 
> member functions and get/set the variables (i.e. the pimpl 
> strategy).

Well unfortunately I cannot control the C++ side of things, but I 
assume that it'll work properly with extern(C++) so I guess I 
will just go ahead and try and see if everything works out. I 
have access to the C++ source so at the very least I can see how 
it's used there and if it's possible in the way I want it to. I 
don't hope I have to have a separate C++ "bridge" to make it work.