arximboldi/immer
Postmodern immutable and persistent data structures for C++ — value semantics at scale observed · 2026-08-28
Health v2 · maintenance only
80/100
- Activity 91
- Release rhythm 53
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 34
- age_days: 3667
- days_rel: 232
- days_push: 59
- n_releases_24m: 2
Adoption not part of the score
2867 stars · 204 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Immer is a C++ library of persistent and immutable data structures such as vectors, maps, and sets built on RRB-trees and HAMTs. It enables value-oriented architectures for interactive and concurrent programs with efficient structural sharing.
Use cases
- immutable vectors in C++
- persistent data structures for concurrent programs
- value semantics for undo/redo or Redux-like state
- efficient structural sharing for large collections
- immutable maps and sets in C++14
When to choose
- you need cheap copies and safe sharing of collections across threads
- you are building interactive apps with value-oriented state management
- you want Clojure-style persistent data structures in C++
When to avoid
- you need mutable in-place performance above all
- you require a very small binary footprint with no structural sharing overhead
Facets
library · maturity stable
data-science developer-tools cpp cross-platform immutable-data-structures persistent-data-structures rrb-tree hamt value-semantics c-plus-plus algorithms
5 sources
- readme: https://github.com/arximboldi/immer · fetched 2026-08-28 · ca3fd8ce8526
- homepage: https://sinusoid.es/immer · fetched 2026-08-29 · ff6a2a268d98
- site_page: https://sinusoid.es/immer/introduction.html · fetched 2026-08-29 · 8f34ac1063e3
- site_page: https://sinusoid.es/immer/python.html · fetched 2026-08-29 · 70b9b482b68b
- site_page: https://sinusoid.es/immer/guile.html · fetched 2026-08-29 · 16ef63222c18
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| arximboldi/immer | main | 80 |
For agents
markdown · JSON · MCP: product_card(name="arximboldi/immer")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem