I'm curious if this has built-in support for extended C++ syntaxes such as Microsoft's extras ... and are there any specific considerations that need to be made for things like C++/CLR, C++/Cx, C++/WinRT headers, etc? Any difficulties with quirky COM-related code in Win32 headers? Or does it just process all of it just fine?

I was actually about to end up having to write one of these myself, from scratch, but then decided to look here first and see if my favorite person to steal from already had a solution available to use and, as I'd hoped, you already had a whole AST system defined. Looks like ClangSharp is providing the back-end service for it, which is a project I'm very, very interested in but haven't had a chance to use yet. I've been working with CsWin32 and Win32Metadata a bit lately, but I'm definitely very interested in what ClangSharp can do and how it differs from those Microsoft projects. I've been gradually making a custom, lightweight .NET 7 interop wrapper for DirectX 11/12 and have been trying to explore alternative tools, libraries, etc that can benefit my work and add some value ...