Passing C++ class to DLL for callbacks from D (Steam)

[rikki cattermole]

On 10/06/2018 10:29 PM, cc wrote:
> And it successfully fires the 3-arg Run method of the callback object.  
> However for some reason the function table of the ISteamClient seems to 
> be off by one.. it kept calling the wrong methods until I commented one 
> out, in this case GetIntPtr() as seen above, then everything seemed to 
> line up.  Not sure what the proper way to ensure it matches the C++ 
> layout here, but at least it seems to be mostly working for now.  Thanks 
> again!

Ugh what GetIntPtr? Unless of course this header file is wrong[0].

Make the members match exactly, order and everything and it should "just 
work".

[0] 
https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/public/steam/isteamclient.h#L113