Rama
(Rama)
2
Writing Animation Blueprints in C++
I have two relevant tutorials here!
Writing custom logic for Animation BP in C++
Making your own Animation BP Nodes (code might be a bit out dated but you get the idea)
I personally do all my Anim BP event graph stuff in C++, except anim notifies, and then use the Anim Graph for all animation work 
This allows me to do fancy math calculations at high speeds in the C++ and pass the results to Anim BP via BP variables