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
Utilize Syntax Tree Transformations as a C/C++ Test
Seam
http://ceur-ws.org/Vol-2217/paper-mar.pdf
https://github.com/martong/finstrument_mock#how-does-it-work