C++ binding issues with C++ function returning a simple POD struct.

[ParticlePeter via Digitalmars-d-learn]

On Monday, 22 May 2017 at 01:39:04 UTC, evilrat wrote:
> On Monday, 22 May 2017 at 01:27:22 UTC, Nicholas Wilson wrote:
>>
>> Probably because the D side is expecting to have the struct 
>> returned in a pointer allocated by the callee and then the C++ 
>> puts it in regs and BOOM.
>>
>> If you wrap the C++ side to return the struct by a pointer 
>> then use that in D, then it should work.
>
> And this is actually D problem. In fact first bug report on 
> this thing was dated back to  2014. Still not fixed.

Thanks for your reply, do you have any links to some bug report 
of that issue?

> There is possible hacky workaround to try - put struct as 
> pointer arg instead of return and make helper method to use it, 
> like this
>
> -------- HACK -------------------
> // extern(C++) of course
> void GetCursorPos(ImVec2* v);
>
> // helper
> ImVec2 GetCursorPos()
> {
>  ImVec2 temp;
>  GetCursorPos(&temp);
>  return temp;
> }
> ----------------------------------

Actually, your example would work just fine, my problem and 
possible solution is the other way around :-). First I'll try to 
force a copy with a wrapper func and same sig.