{"adoption": {"forks": 224, "observed_at": "2026-08-28T04:05:44.479473+00:00", "stars": 1852}, "canonical_url": "https://ross.abutalabs.com/products/hana", "card": {"archived": false, "artifact_type": "library", "description": "Your standard library for metaprogramming", "domain": ["programming-languages", "developer-tools"], "enriched": true, "function": ["serialization", "developer-tools"], "health_score": 78, "homepage": "http://boostorg.github.io/hana", "language": "C++", "license": "BSL-1.0", "license_family": "other", "maturity": "stable", "member_repos": ["boostorg/hana"], "name": "boostorg/hana", "platform": ["cpp", "cross-platform"], "pushed_at": "2026-08-12T11:35:26+00:00", "repo": "boostorg/hana", "stars": 1852, "tags": ["metaprogramming", "header-only", "cpp14", "cpp11", "boost", "compile-time", "type-level-programming", "constexpr", "algorithms"], "topics": ["hana", "boost", "cpp", "metaprogramming", "cpp14", "cpp11", "header-only"], "urls": [], "use_cases": ["manipulate heterogeneous tuples at compile time in C++", "perform type-level computations with normal C++ syntax", "check expression validity without SFINAE tricks", "unroll loops at compile time", "introspect user-defined struct members", "replace MPL/Fusion-style metaprogramming with a modern API"], "what_it_is": "Boost.Hana is a header-only C++14 metaprogramming library providing a standard library for computations on both types and values, including heterogeneous sequences, algorithms, and compile-time introspection. It is part of Boost and requires no external dependencies.", "when_to_avoid": ["your codebase is limited to C++11-only compilers without full C++14 support", "you only need simple constexpr utilities that don't justify a metaprogramming library", "compile times are extremely critical and heavy template instantiation is unacceptable"], "when_to_choose": ["you need compile-time computations on types and values in C++14 or later", "you want a header-only, dependency-free metaprogramming library", "you want to unify value and type computations in one API"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/hana", "repo": "boostorg/hana", "role": "main", "score": 66}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:05:44.479473+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T03:16:52.468078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "94bdd504cb5b2fa4cee3372aac90498fa51368c73c90ace87dd76d8f0ef0b598", "fetched_at": "2026-08-28T04:05:44.479473+00:00", "kind": "readme", "missing": false, "url": "https://github.com/boostorg/hana"}, {"content_hash": "28d3e72469c54c9ddea2c6bf23e643b3d3d8bb11ccd7bb6f18545fbafe0258e7", "fetched_at": "2026-08-29T10:55:57.527995+00:00", "kind": "homepage", "missing": false, "url": "http://boostorg.github.io/hana"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 97, "longevity": 100, "rhythm": 8}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4491, "days_push": 21, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 66, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}