67 std::ostream& operator<<(std::ostream& o, const AuthorizationSetDifferences& diffs) {  in operator <<()  argument
68     if (!diffs.aWhackB.empty()) {  in operator <<()
69         o << "Set " << diffs.aName << " contains the following that " << diffs.bName << " does not"  in operator <<()
70           << diffs.aWhackB;  in operator <<()
71         if (!diffs.bWhackA.empty()) o << std::endl;  in operator <<()
74     if (!diffs.bWhackA.empty()) {  in operator <<()
75         o << "Set " << diffs.bName << " contains the following that " << diffs.aName << " does not"  in operator <<()
76           << diffs.bWhackA;  in operator <<()
89     AuthorizationSetDifferences diffs = {std::move(aName), std::move(bName), {}, {}};  in difference()  local
90     std::set_difference(a.begin(), a.end(), b.begin(), b.end(), std::back_inserter(diffs.aWhackB));  in difference()
91     std::set_difference(b.begin(), b.end(), a.begin(), a.end(), std::back_inserter(diffs.bWhackA));  in difference()
92     return diffs;  in difference()