{
  "$type": "site.standard.document",
  "bskyPostRef": {
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    "uri": "at://did:plc:ivbknywyskln22er3nkssdhl/app.bsky.feed.post/3miy7kyvzprn2"
  },
  "path": "/t/alloc-only-hashmap/24071#post_7",
  "publishedAt": "2026-04-06T23:23:29.000Z",
  "site": "https://internals.rust-lang.org",
  "tags": [
    "hashbrown",
    "BTreeMap",
    "BTreeSet"
  ],
  "textContent": "A few alternatives:\n\nHave you considered using the hashbrown crate? It is the crate std uses for its hashmap/hashset implementation. This crate is no_std compatible.\n\nIf you don't want to add a new dependency, then you could use BTreeMap and BTreeSet, which do live in the `alloc` crate.\n\nIf you do need HashMap specifically, then you are a bit out of luck.",
  "title": "`alloc`-only `HashMap`?"
}