Clang-uml – C++ to UML diagram generator based on Clang
Hi, clang-uml is an open-source C++ to UML diagram generator, driven by YAML configuration files. The main idea behind the project is to easily maintain up-to-date diagrams within a code-base or document legacy code. The configuration file for clang-uml defines the types and contents of each generated diagram. The diagrams can be currently generated in PlantUML and JSON formats. Main features: - class, sequence, package and include diagrams - up to C++17 with support for C++20 concepts - visualization of template specialization relationships - declarative diagram content filtering based on…
In plain words
Clang-uml is an open-source C++ to UML diagram generator that uses YAML configuration files to automatically create diagrams from code. It supports class, sequence, package, and include diagrams for C++17 and C++20 code, with output in PlantUML and JSON formats. The tool helps maintain current documentation and understand legacy codebases through configurable filtering, template relationship visualization, and namespace-based package generation.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi, clang-uml is an open-source C++ to UML diagram generator, driven by YAML configuration files. The main idea behind the project is to easily maintain up-to-date diagrams within a code-base or document legacy code. The configuration file for clang-uml defines the types and contents of each generated diagram. The diagrams can be currently generated in PlantUML and JSON formats. Main features: - class, sequence, package and include diagrams - up to C++17 with support for C++20 concepts - visualization of template specialization relationships - declarative diagram content filtering based on namespaces, elements and relationships - relationship inference from C++ containers, smart pointers and custom templates - customizable interactive links in diagrams (SVG output only) - generation of UML packages from namespaces or directories - JSON output containing intermediate diagram model representation for custom processing More features, usage information and examples are in README at https://github.com/bkryza/clang-uml and online docs at https://clang-uml.github.io In particular, checkout diagrams generated from test cases here: https://clang-uml.github.io/md_docs_2test__cases.html
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