关于本章
本章描述 extended visitor pattern,这是在阅读 eli.thegreenplace The Expression Problem and its solutions 时所发现的,在 ./The-Expression-Problem-and-its-solutions
中收录了这篇文章。
除此之外,以下文章中也描述了 extended visitor pattern:
rice.edu Understanding the Extended Visitor Pattern
neu.edu Functional Visitors Revisited
ed.ac.uk Independently Extensible Solutions to the Expression Problem
stackoverflow Extend Visitor pattern without modifying the original source code?