Rusty Ownership and the Lifecycle’s Stone

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  • book

    The Rust Programming Language

    What can I say, I like memes & jokes ¯\_(ツ)_/¯

    On a more serious note, I think lighthearted content is what's needed when it comes to intro stuff. There are no puns in the Rust Book ( ) ;)

  • tokio

    A runtime for writing reliable asynchronous applications with Rust. Provides I/O, networking, scheduling, timers, ...

    Well, the blog examples are quite trivial.

    Take a look at the standard hashmap implementation ( Notice the lifetime annotations everywhere. This is a relatively basic data structure, but it has a ton of visual noise due to the constraints of the lifetime and borrow model, and programmers must know, understand and be able to reason about these constraints when using this data structure.

    Now imagine a case where you need to operate on values with two (or more) different lifetimes (by definition, all must live at least as long as the one with smallest lifetime, but in practice they all can and will have different lifetimes). Now you have `'a` and `'b` (and perhaps more) everywhere *and* developers must now reason about that. (random example pulled from a popular networking crate:

    It isn't trivial to pick up from scratch, especially if one comes from a much higher level language (C#, Java, python, etc.). This is true even for people who are very experienced writing high-quality, durable, and safe code in other languages (e.g., C++) without the help of a compiler, because the ownership and lifetime model are both different and compiler-enforced.

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