- auto c1 = binary.add(r, &Receiver::r2);
- auto c2 = binary.add([&r](const auto& v1, const auto& v2){ r.r2(v1, v2); });
+ ScopedConnection c1 = binary.add(r, &Receiver::r2);
+ ScopedConnection c2 = binary.add([&r](const auto& v1, const auto& v2){ r.r2(v1, v2); });