nomicon/src/arc.md

# Implementing Arc

In this section, we'll be implementing a simpler version of `std::sync::Arc`.
Similarly to [the implementation of `Vec` we made earlier](vec.md), we won't be
taking advantage of as many optimizations, intrinsics, or unstable code as the
standard library may.

This implementation is loosely based on the standard library's implementation
(technically taken from `alloc::sync` in 1.49, as that's where it's actually
implemented), but it will not support weak references at the moment as they
make the implementation slightly more complex.

Please note that this section is very work-in-progress at the moment.
Simple Arc implementation (without Weak refs) This is a squash of the following commits: - Fix code, remove WIP message as that was while writing this, and link to stable @ fixed 1.49 rather than latest nightly - Improve wording on deref and ignore some code blocks - Improve wording and formatting a bit cause I'm insane - Fix links - Fix links again because we all love relative links - Remove unnecessary Drop import - Use Box::from_raw instead of ptr::drop_in_place as that actually dealloc's the Box (i'm dumb and misinterpreted the std code :/); fix some desync between code in between sections - Fix tests 5 years ago			`# Implementing Arc`

			In this section, we'll be implementing a simpler version of `std::sync::Arc`.
			Similarly to [the implementation of `Vec` we made earlier](vec.md), we won't be
			`taking advantage of as many optimizations, intrinsics, or unstable code as the`
			`standard library may.`

			`This implementation is loosely based on the standard library's implementation`
			(technically taken from `alloc::sync` in 1.49, as that's where it's actually
			`implemented), but it will not support weak references at the moment as they`
			`make the implementation slightly more complex.`

			`Please note that this section is very work-in-progress at the moment.`