On: Untangling Lifetimes: The Arena Allocator

[williamcotton]

As a C programmer who uses memory arenas quite frequently can you expand on what you know about Rust’s current or future support for such a feature?

I’d like to start writing new projects in Rust and I’d like to continue to use this approach to memory management!

[creata → williamcotton]

You can of course use arenas in Rust just like in C. I think the parent was talking about support for using arenas as the memory for stuff like built-in containers (dynamic arrays, hash maps, etc.):

https://github.com/rust-lang/wg-allocators

[williamcotton → creata]

Thank you! Yeah, something like bumpalo would work just fine right now but for the future this is a great interface:

https://docs.rs/bumpalo/latest/bumpalo/#nightly-rust-allocat...

  use bumpalo::Bump;
  
  let bump = Bump::new();
  
  let mut v = Vec::new_in(&bump);
  v.push(0);
  v.push(1);
  v.push(2);