Passing opaque struct between functions/modules

[Sarath Kumar]

On Wednesday, 23 January 2013 at 17:14:31 UTC, Ali Çehreli wrote:
> On 01/23/2013 08:33 AM, Sarath Kumar wrote:
>
> > Can someone please tell me the right way to pass an opaque
> object
> > between module's functions.
>
> I am assuming that you are interfacing with a C library. That 
> library must have a D binding file. I am assuming that it is 
> your libA.d:
>
>
> There is also a library that implements the struct and the 
> functions. Although you would have it in the C library, here is 
> a D module to imitate it:
>
> // libA_impl.d
> // These are presumably defined in a C library. Simply 
> imitating it with this
> // D module
> extern (C)
> {
>     struct Opaque
>     {
>         int i;
>         double d;
>     }
>
>     Opaque* getObject()
>     {
>         return new Opaque(42, 1.5);
>     }
>
>     void doSomething(Opaque *)
>     {}
> }
>

I don't know the contents of the struct as libA and libB are 3rd 
party C libraries.