how to catch D Throwables (or exceptions) from C++?

[Nicholas Wilson via Digitalmars-d-learn]

On Thursday, 1 December 2016 at 01:58:13 UTC, Timothee Cour wrote:
> eg:
>
> ```
> dlib.d:
> extern(C) void dfun(){assert(0, "some_msg");}
>
> clib.cpp:
> extern "C" void dfun();
> void fun(){
>   try{
>     dfun();
>   }
>   catch(...){
>     // works but how do i get "some_msg" thrown from D?
>   }
> }
> ```

portably not sure, but if you're using dwarf / libunwind you can 
probably use the API directly and get a pointer to the exception 
object and dereference a field of it's (i.e. p+ 
Throwable.msg.offsetof ).