Re: [PATCH v2 0/15] MR3157: include: Introduce wine_dbgstr_h and debugstr_h.

[Bernhard Kölbl (＠besentv)]

Bernhard Kölbl (@besentv) commented about include/wine/debug.h:
>  return wine_dbgstr_wn( s, -1 );
>
> }
>
> +static inline const char *wine_dbgstr_h( struct HSTRING__ *hstr )
> +{
> - const WCHAR *str;
> - UINT32 len;
> - if (hstr && !((ULONG_PTR)hstr >> 16)) return "(invalid)";

Just out of curiosity, could someone explain the workings behind this line? Especially `((ULONG_PTR)hstr >> 16))`is really puzzling for me.