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NOTES.md

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Notes

  • I use std::any instead of Java's Object, but could potentially use std::variant<bool, double, std::string> in the future

  • Not sure if string interning will be implemented in the book, but it could greatly reduce the cost of copying std::any objects - it's cheap when it has bool or double in it, but not so when it has the std::string - if there was a global table of strings and std::any had a pointer to a string, it would be much cheaper.

  • Visitor pattern as in book doesn't work in C++ - you can't have template virtual methods. For now only ExprVisitor<std::any> is supported in expressions - but that's enough for now.

  • I don't use code generation as done in the book. Generating C++ feels dangerous and incorporating it into CMake build is not easy. Maybe later?