The current implementation requires repetition of type name if delivery filter is used with so_5::single_sink_binding_t and so_5::multi_sink_binding_t:

so_5::single_sink_binding_t binding;
binding.bind<MyMsg>(src_mbox, dest_msink, [](const MyMsg & msg) {...});

It would be cool to have a possibility to use const auto& as argument type for delivery filter:

so_5::single_sink_binding_t binding;
binding.bind<MyMsg>(src_mbox, dest_msink, [](const auto & msg) {...});

It may make code more flexible (especially in case of templates).