C++ / Wrong function signature generated for reference parameter

[kinke]

On Thursday, 3 May 2018 at 07:00:03 UTC, Robert M. Münch wrote:
> using struct won't give the correct signature

That's why there's `extern(C++, class) struct Image`, see 
https://dlang.org/spec/cpp_interface.html#classes.

> Not sure about the const part too, if this is correct on the D 
> side...

As const is transitive in D, mangling a const object reference as 
C++ `const T *const` is consistent, but also means that a `const 
T *` cannot be mapped directly to D via a class (but as 
`const(T)*` if T is a D struct).