module Concurrent::Concern::Observable

def add_observer(observer = nil, func = :update, &block)

Returns:
  • (Object) - the added observer

Parameters:
  • func (Symbol) -- the function to call on the observer during notification.
  • observer (Object) -- the observer to add 
def add_observer(observer = nil, func = :update, &block)
  observers.add_observer(observer, func, &block)
end