D Bindings for C Opaque Pointers

[Paul Backus]

On Thursday, 3 December 2020 at 00:30:06 UTC, Kyle Ingraham wrote:
>
> // EDSDKTypes.h
> typedef struct __EdsObject* EdsBaseRef;
> typedef EdsBaseRef EdsCameraListRef;
> //
>
[...]
>
> // edsdk.d
> struct EdsBaseRef;
> alias EdsBaseRef EdsCameraListRef;

You've dropped a level of indirection here. In the C header, 
EdsBaseRef is a pointer, but in your D code, it is an opaque 
struct.

The correct way to translate these C declarations into D is:

struct __EdsObject;
alias EdsBaseRef = __EdsObject*;
alias EdsCameraListRef = EdsBaseRef;

Note that unlike C, D does not allow us to refer to an incomplete 
type without first declaring it.