On Fri, 21 Jan 2022 at 14:12, Nicholas Clark <nick@ccl4.org> wrote: > Really you want to know you have a problem *before* you call the callback > (ie what Yves wrote - you want to be able to flag a problem at object > construction time, which might well be program startup. Not fail at > runtime, > unattended, into a log file or even /dev/null) > So am i correct in understanding that you would be ok with exposing an API to check the subs arity signature? If so then I'll try to think up one (others could too). cheers YvesThread Previous | Thread Next