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Manishearth/elsa

Append-only collections for Rust where borrows to entries can outlive insertions
Source code at GitHub null
Manishearth/elsa.json
{
  "createdAt": "2018-12-21T00:15:25Z",
  "defaultBranch": "master",
  "description": "Append-only collections for Rust where borrows to entries can outlive insertions",
  "fullName": "Manishearth/elsa",
  "homepage": null,
  "language": "Rust",
  "name": "elsa",
  "pushedAt": "2025-11-18T15:11:53Z",
  "stargazersCount": 264,
  "topics": [],
  "updatedAt": "2025-11-18T15:11:57Z",
  "url": "https://github.com/Manishearth/elsa"
}

elsa

Section titled “elsa”

Build Status Current Version License: MIT/Apache-2.0

🎵 Immutability never bothered me anyway 🎶

This crate provides various “frozen” collections.

These are append-only collections where references to entries can be held on to even across insertions. This is safe because these collections only support storing data that’s present behind some indirection — i.e. String, Vec<T>, Box<T>, etc, and they only yield references to the data behind the allocation (&str, &[T], and &T respectively)

The typical use case is having a global cache of strings or other data which the rest of the program borrows from.

Running all examples

Section titled “Running all examples”
Terminal window
cargo test --examples --features indexmap