flecs

![flecs](docs/img/logo.png)

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Flecs is a fast and lightweight Entity Component System that lets you build games and simulations with millions of entities ([join the Discord!](https://discord.gg/BEzP5Rgrrp)). Here are some of the framework's highlights:

- Fast and [portable](#language-bindings) zero dependency [C99 API](https://www.flecs.dev/flecs/group__c.html)
- Modern type-safe [C++17 API](https://www.flecs.dev/flecs/group__cpp.html) that doesn't use STL containers
- First open source ECS with full support for [Entity Relationships](https://www.flecs.dev/flecs/Relationships.html)!
- Fast native support for [hierarchies](https://www.flecs.dev/flecs/HierarchiesManual.html) and [prefabs](https://www.flecs.dev/flecs/PrefabsManual.html)
- Code base that builds in less than 5 seconds
- Runs [in the browser](https://flecs.dev/city) without modifications with emscripten
- Cache friendly [archetype/SoA storage](https://ajmmertens.medium.com/building-an-ecs-2-archetypes-and-vectorization-fe21690805f9) that can process millions of entities every frame
- Automatic component registration that works out of the box across shared libraries/DLLs
- Write free functions with [queries](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/queries/basics) or run code automatically in [systems](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/systems/pipeline)
- Run games on multiple CPU cores with a fast lockless scheduler
- Verified on all major compilers and platforms with [CI](https://github.com/SanderMertens/flecs/actions) running more than 13000 tests
- Integrated [reflection framework](https://www.flecs.dev/flecs/group__c__addons__meta.html) with [JSON serializer](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/reflection/basics_json) and support for [runtime components](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/reflection/runtime_component)
- [Unit annotations](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/reflection/units) for components
- Powerful [query language](https://github.com/SanderMertens/flecs/tree/master/examples/cpp/queries) with support for [joins](https://github.com/SanderMertens/flecs/tree/master/examp