- Crazy initialization That sure is a lot of ways to initialize a variable! Even though some of these variables are quite different and would be initialized differently from each other in many other languages, even only counting the initializations that are functionally equivalent, there are a bunch of abuses of syntax that I’ve never seen used in the wild.
Initialization in C++ is so simple that somebody wrote a nearly 300-page book on the subject: https://www.cppstories.com/2023/init-story-print/
I plan to read it after finishing this 260 page book on move schematics in C++: https://www.cppmove.com/
That is not just a book about how to "cut potatoes". That is "A Creative Cooking Guide for Exercising Knife Skills", using potatoes as a medium. Similarly, your Rust book is an book on concurrency using Rust as a medium, as per the title: "Low-Level Concurrency in Practice". Both are complex topics, and both have picked a medium. Thus, they do not necessarily reflect on the underlying complexity of the medium, though concurrency in Rust is a complex topic due to the fact that the core language itself does a lot of work to make it "safe". Async would probably be an even better example of that.
However, in the case of initialization in C++ and in the case of move schematics in C++, these are topics that are complex because the core language has been accumulating complexity for a long time, and because the language designers cannot afford to break backwards compatibility. Which makes implementing and using move-schematics in C++, as an end-user of the language, much, much more complicated than in a language like Rust, that did not have to bolt this behavior on top of an already complicated language. Similarly with initialization, where C++ has accumulated many, syntactically overlapping forms of initialization, for both member and non-member variables variables