datatype99

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  "desc": "Algebraic data types for C99",
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  "enrichment_fetched_at": "2026-06-20T23:36:51+00:00",
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  "full_name": "datatype99",
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  "github_last_commit_at": "2025-03-17T03:16:52Z",
  "github_readme_excerpt": "\u003cdiv align=\"center\"\u003e\n  \u003ca href=\"examples/binary_tree.c\"\u003e\u003cimg src=\"images/preview.png\" width=\"600px\" /\u003e\u003c/a\u003e\n  \u003ch1\u003eDatatype99\u003c/h1\u003e\n  \u003ca href=\"https://github.com/hirrolot/datatype99/actions\"\u003e\n    \u003cimg src=\"https://github.com/hirrolot/datatype99/workflows/C/C++%20CI/badge.svg\"\u003e\n  \u003c/a\u003e\n\n  Safe, intuitive [algebraic data types] with exhaustive pattern matching \u0026 compile-time introspection facilities. No external tools required, pure C99.\n\u003c/div\u003e\n\n[algebraic data types]: https://en.wikipedia.org/wiki/Algebraic_data_type\n\n## Highlights\n\n - **Type-safe.** Such things as improperly typed variants, non-exhaustive pattern matching, and invalid field access are caught at compile-time.\n\n - **Portable.** Everything you need is a standard-conforming C99 compiler; neither the standard library, nor compiler/platform-specific functionality or VLA are required.\n\n - **Predictable.** Datatype99 comes with formal [code generation semantics], meaning that the generated data layout is guaranteed to always be the same.\n\n - **Comprehensible errors.** Datatype99 is [resilient to bad code].\n\n - **Battle-tested.** Datatype99 is used at [OpenIPC] to develop real-time streaming software for IP cameras; this includes an [RTSP 1.0 implementation] along with ~50k lines of private code.\n\n[resilient to bad code]: #q-what-about-compile-time-errors\n[OpenIPC]: https://openipc.org/\n[RTSP 1.0 implementation]: https://github.com/OpenIPC/smolrtsp/\n\n## Installation\n\nDatatype99 consists of one header file `datatype99.h` and one dependency [Metalang99]. To use it in your project, you need to:\n\n[Metalang99]: https://github.com/hirrolot/metalang99\n\n 1. Add `datatype99` and `metalang99/include` to your include directories.\n 2. Specify [`-ftrack-macro-expansion=0`] (GCC) or [`-fmacro-backtrace-limit=1`] (Clang) to avoid useless macro expansion errors.\n\n[`-ftrack-macro-expansion=0`]: https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html\n[`-fmacro-backtrace-limit=1`]: https://clang.llvm.org/docs/ClangCommandLine",
  "github_repo": "Hirrolot/datatype99",
  "github_stars": 1500,
  "github_topics": [
    "adt",
    "algebraic",
    "algebraic-data-types",
    "c99",
    "derive",
    "introspection",
    "metalang99",
    "metaprogramming",
    "pattern-matching",
    "reflection-library",
    "sum-types",
    "tagged-unions",
    "type-system",
    "variant"
  ],
  "homepage": "https://github.com/Hirrolot/datatype99",
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  "license": "MIT",
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  "name": "datatype99",
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  "ruby_source_path": "Formula/d/datatype99.rb",
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