This is an article about design patterns (in particular the 1994-200x craze for them after the Gang of Four book was published). Having emerged from that era mi

This is an article about design patterns (in particular the 1994-200x craze for them after the Gang of Four book was published). Having emerged from that era might be table stakes for understanding this article. Visitor pattern is a code inversion where inheritance and/or function overloading fills in for a missing language feature (concise runtime pattern matching on types). It has its pros and cons but seemed like opening your third eye circa 1995.