Adders were easily implementable and readily available pre-Java8, basically they need the new JMM from java5 on (i.e 10+ years). Hence, no really a hot topic, y

Adders were easily implementable and readily available pre-Java8, basically they need the new JMM from java5 on (i.e 10+ years). Hence, no really a hot topic, yet very nice to have. However any serious project already had something of the sort. On the other topic: async/coroutines/friends etc have nothing to do with "adders". The latter are a low-level concurrency primitives that enable fast counters and the like. Feel challenged to write a good a simple counter (like page hit) with co-routines or sync.