I am using CreateThreadpoolIO, it takes a callback function as its second argument. My understanding was tB introduced delegates to strngly type function pointers in API declares. But I also saw you post about some bugs int he changelog, although that seemed to be regarding delgates in UDTs.

Is there a blocker or is it a gap or is it something you haven't had time for.

WinDevLib is the main reason I use tB at the moment, it is like more readable C++