https://www.coldfix.eu/2015/05/16/bison-c++11/
https://www.geeksforgeeks.org/flex-fast-lexical-analyzer-generator/
http://anoopsarkar.github.io/compilers-class/yacc-practice.html
vid calculator written with flex/bison
https://nullprogram.com/blog/2019/01/25/
books
courses
https://github.com/mono/CppSharp/blob/cae9431cd81c62df5e0900dc00f7e7a0ac0940ca/src/CppParser/Bindings/CLI/Decl.cpp#L1845