On the contrary, I worked with CAF and I found it one of the simpler frameworks that provide the actor model (simpler to use, that is). Later I learned about Erlang and I noticed a lot of similarities between CAF and message passing in Erlang. Look at this https://github.com/actor-framework/actor-framework/blob/mast..., for example. There are multiple implementations of the same thing (calculator). But each implementation is simple enough to grasp without any prior knowledge of the framework.