v.1.5.0

The asio_one_thread and asio_thread_pool dispatchers use the standard way of providing custom worker threads introduced in SO-5.7.3 (via abstract_work_thread_t and abstract_work_thread_factory_t interfaces). Because of that Traits-types for those dispatchers are now empty. It can be a breaking change if you are using custom threads via a Traits-type.

A new type of mbox is added. This is unique-subscribers mbox, it allows having several different subscribers if all of those subscribers are subscribed to different message types.