R++ is an extension to C++ that supports rule-based programming. Thus, programs written in R++ have all the facilities of C++ plus a new programming construct: a rule. A rule is like an if-statement, but it is located apart from the procedural code and is triggered automatically upon changes to the data that it monitors. R++ was developed at AT&T Labs (just like C and C++). It facilitates the development of event-driven systems, debugging tools, database triggers, and Artificial Intelligence. You can read more about R++ and see samples of R++ vs. C++ code at www.research.att.com/sw/tools/r%2b%2b/.
When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.