[color=#000000
ost_uid0]Okay, I found it. Subtle bug: the declaration inside ZStreamable declared zilla:
perator<< to be a friend, but the actual operator was :
perator<< (no namespace).
Besides which I've switched back to
cgicc::MStreamable instead of my custom ZStreamable, because I was able to work out my issues from that.[/color
ost_uid0]