Comment by Panzerschrek

> Don’t use RTTI.

That's the core feature of the language. Not using it doesn't make any sense.

> Don’t use stream (<iostream>, <stringstream>, etc.), use printf style functions instead.

printf is type-unsafe and bug-prone. Also modern C++ standards have better formatting utilities.

> Don’t use anything from STL that allocates memory, unless you don’t care about memory management.

In 99.9% of the time one should not care. Using something like std::vector is perfectly fine.

Overall I find such "Orthodox" C++ harmful. I call it "pure C heresy".