AI without using Blackboard Componets and Behavior Trees?

I’ve been looking through the code of the shooter game to create my own AI bots. After several hours of searching I’ve found that it uses a Behavior Tree and Blackboards also with some blue prints to run the methods.

Could someone show an example in only c++ of a task that would run a method every tick as the example was very unclear in how it works, especially with the use of blueprints?

Just for more information I’ve already made AI in UE3 so I understand about the method Tick() and navigation paths etc.