On Thursday, 22 October 2020 at 19:57:08 UTC, mw wrote: > Do you pass any variable from D to C? and how does those > variables look like? > > And if you are passing any D object to C, do you always hold a > reference to them before the C returns? I mean: the D's gc s/before/after > think the object is no longer used, but actually is used by the > C side.