# ReactiveX/RxCpp

Reactive Extensions for C++

Repository: https://github.com/ReactiveX/RxCpp
Canonical: https://ross.abutalabs.com/products/rxcpp
Language: C++
License: Apache-2.0
License Family: permissive
Topics: reactivex, c-plus-plus, rxcpp, algorithms, virtuous-procrastination, values-distributed-in-time
Last push: 2024-07-30T22:41:39+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4746, "days_push": 764, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3209, forks 406 (observed 2026-08-28T04:07:48.688985+00:00)

## What it is
RxCpp is a header-only C++ library implementing Reactive Extensions, providing algorithms for composing asynchronous and event-based streams of values distributed in time. It depends only on the standard library and integrates via simple include paths or package managers like vcpkg and NuGet.

## Use cases
- compose asynchronous event streams in C++
- handle values distributed over time reactively
- build reactive pipelines for UI or sensor events
- process streams of data with composable operators
- manage concurrency without manual thread coordination
- transform async callbacks into observable sequences

## When to choose
- you need reactive/observable programming idioms in C++
- you want a header-only library with no external dependencies
- you are coordinating multiple asynchronous data sources or event streams

## When to avoid
- your project is simple and synchronous with no async event handling
- you need actively developed features - the project is in maintenance mode
- you prefer coroutine-based async patterns over Rx-style operators

## Facets
- artifact type: library
- maturity: maintenance
- function: concurrency, streaming, developer-tools
- domain: developer-tools, cross-platform
- platform: cpp, cross-platform, windows
- tags: reactive-extensions, observables, header-only, async, event-streams, algorithms, linux, macos

## Member repositories
- ReactiveX/RxCpp (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:48.688985+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:24:44.799001+00:00, confidence not recorded.
  - readme: https://github.com/ReactiveX/RxCpp (fetched 2026-08-28T04:07:48.688985+00:00, sha 10af7a8cb2b7)
- Data as of 2026-08-30T08:39:29.467469+00:00.