# seanbaxter/circle

The compiler is available for download. Get it!

Repository: https://github.com/seanbaxter/circle
Canonical: https://ross.abutalabs.com/products/seanbaxter-circle
Homepage: http://www.circle-lang.org/
Language: C++
License Family: other
Last push: 2023-11-05T13:17:59+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 2755, "days_push": 1032, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2574, forks 72 (observed 2026-08-28T04:07:01.585846+00:00)

## What it is
Circle is a C++ compiler by Sean Baxter that extends C++ with new language features like choice types, pattern matching, interfaces, and reflection traits while maintaining 100% compatibility with existing C++ code. Its 'New Circle' transformation introduces fine-grained versioning so projects can opt into safer, more productive language features.

## Use cases
- compile C++ code with pattern matching and choice types
- try a modern C++ successor language with full compatibility
- use reflection and pack traits in C++ templates
- experiment with safer C++ language features via feature pragmas
- explore memory safety extensions for C++

## When to choose
- you want cutting-edge C++ language features not yet in standard compilers
- you need 100% compatibility with existing C++ codebases while adopting new syntax
- you're researching C++ language evolution and memory safety

## When to avoid
- you need a fully standard-conforming compiler for production portability
- you require a permissive open-source license (the repo has no license)
- you need long-term vendor support or a large community

## Facets
- artifact type: cli-tool
- maturity: active
- function: compiler, programming-language
- domain: programming-languages, compilers, developer-tools
- platform: windows, cpp
- tags: cpp, c++-compiler, language-evolution, pattern-matching, reflection, memory-safety, circle-lang, compiler, linux, macos

## Member repositories
- seanbaxter/circle (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:01.585846+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 2026-08-30T08:31:48.254957+00:00, confidence not recorded.
  - readme: https://github.com/seanbaxter/circle (fetched 2026-08-28T04:07:01.585846+00:00, sha 03fad83bfdbd)
  - homepage: http://www.circle-lang.org/ (fetched 2026-08-29T10:05:25.791657+00:00, sha 6dc4abbbdf8d)
- Data as of 2026-08-30T08:39:29.467469+00:00.