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Found this on Mastodon https://fosstodon.org/@dpom/112681955888465502 , and it is a very nice overview of the containers and their layout.
This is outdatded. Mutexes don't allocate anymore. That's how Mutex::new can be const.
Nice sheet, though I have a few critiques:
where T: Sized for references &T? A reference can definitely point to an unsized type, e.g. &str.&T, &[T] and &dyn Trait) may either point to the stack or the heap.
- Why does it say
where T: Sizedfor references&T? A reference can definitely point to an unsized type, e.g.&str.
I think the point being made is that the layout shown only applies for Sized T. Layouts for &[T] and &dyn Trait are shown elsewhere on the sheet. &str is noted under &[T].
Edit: although, similar considerations would apply to other pointer types, but that isn't noted on the sheet except for Box<[T]>
Because when T is !Sized, the layout is different, it looks more like the layout of &[T].