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[](https://github.com/skypjack/entt/actions)
[](https://codecov.io/gh/skypjack/entt)
[](https://godbolt.org/z/zxW73f)
[](https://skypjack.github.io/entt/)
[](https://vcpkg.link/ports/entt)
[](https://conan.io/center/recipes/entt)
[](https://gitter.im/skypjack/entt)
[](https://discord.gg/5BjPWBd)
> `EnTT` has been a dream so far, we haven't found a single bug to date and it's
> super easy to work with
>
> -- Every EnTT User Ever
`EnTT` is a header-only, tiny and easy to use library for game programming and
much more written in **modern C++**.<br/>
[Among others](https://github.com/skypjack/entt/wiki/EnTT-in-Action), it's used
in [**Minecraft**](https://minecraft.net/en-us/attribution/) by Mojang, the
[**ArcGIS Runtime SDKs**](https://developers.arcgis.com/arcgis-runtime/) by Esri
and the amazing [**Ragdoll**](https://ragdolldynamics.com/).<br/>
If you don't see your project in the list, please open an issue, submit a PR or
add the [#entt](https://github.com/topics/entt) tag to your _topics_! :+1:
---
Do you want to **keep up with changes** or do you have a **question** that
doesn't require you to open an issue?<br/>
Join the [gitter channel](https://gitter.im/skypjack/entt) and the
[discord server](https://discord.gg/5BjPWBd), meet other users like you. The
more we are, the better for everyone.<br/>
Don't forget to check the
[FAQs](https://github.com/skypjack/entt/wiki/Frequently-Asked-Questions) and the
[wiki](https://github.com/skypjack/entt/wiki) too. Your answers may already be
there.
Do you want to support `EnTT`? Consider becoming a
[**sponsor**](https://github.com/users/skypjack/sponsorship) or making a
donation via [**PayPal**](https://www.paypal.me/skypjack).<br/>
Many thanks to [these people](https://skypjack.github.io/sponsorship/) and
**special** thanks to:
[](https://mojang.com)
[](https://img.ly/)
# Table of Contents
* [Introduction](#introduction)
* [Code Example](#code-example)
* [Motivation](#motivation)
* [Benchmark](#benchmark)
* [Integration](#integration)
* [Requirements](#requirements)
* [CMake](#cmake)
* [Natvis support](#natvis-support)
* [Packaging Tools](#packaging-tools)
* [pkg-config](#pkg-config)
* [Documentation](#documentation)
* [Tests](#tests)
* [EnTT in Action](#entt-in-action)
* [Contributors](#contributors)
* [License](#license)
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# Introduction
The entity-component-system (also known as _ECS_) is an architectural pattern
used mostly in game development. For further details:
* [Entity Systems Wiki](http://entity-systems.wikidot.com/)
* [Evolve Your Hierarchy](http://cowboyprogramming.com/2007/01/05/evolve-your-heirachy/)
* [ECS on Wikipedia](https://en.wikipedia.org/wiki/Entity%E2%80%93component%E2%80%93system)
This project started off as a pure entity-component system. Over time the
codebase has grown as more and more classes and functionalities were added.<br/>
Here is a brief, yet incomplete list of what it offers today:
* Built-in **RTTI system** mostly similar to the standard one.
* A `constexpr` utility for human-readable **resource names**.
* Minimal **configuration system** built using the monostate pattern.
* Incredibly fast **entity-component system** with its own _pay for what you
use_ policy, unconstrained component types with optional pointer stability and
hooks for storage customization.
* Views and groups to iterate entities and components and allow different access
patterns, from **perfect SoA** to fully random.
* A lot of **facilities** built on top of the entity-component system to help
the users and avoid reinventing the wheel.
* General purpose **execution graph builder** for optimal scheduling.
* The smallest and most basic implementation of a **service locator** ever seen.
* A built-in, non-intrusive and macro-free runtime **reflection system**.
* **Static polymorphism** made simple and within everyone's reach.
* A few homemade containers, like a sparse set based **hash map**.
* A **cooperative scheduler** for processes of any type.
* All that is needed for **resource management** (cache, loaders, handles).
* Delegates, **signal handlers** and a tiny event dispatcher.
* A general purpose **event emitter** as a CRTP idiom based class template.
* And **much more**! Check out the
[**wiki**](https://github.com/skypjack/entt/wiki).
Consider this list a work in progress as well as the project. The whole API is
fully documented in-code for those who are brave enough to read it.<br/>
Please, do note that all tools are also DLL-friendly now and run smoothly across
boundaries.
One thing known to most is that `EnTT` is also used in **Minecraft**.<br/>
Given that the game is available literally everywhere, I can confidently say
that the library has been sufficiently tested on every platform that can come to
mind.
## Code Example
```cpp
#include <entt/entt.hpp>
struct position {
float x;
float y;
};
struct velocity {
float dx;
float dy;
};
void update(entt::registry ®istry) {
auto view = registry.view<const position, velocity>();
// use a callback
view.each([](const auto &pos, auto &vel) { /* ... */ });
// use an extended callback
view.each([](const auto entity, const auto &pos, auto &vel) { /* ... */ });
// use a range-for
for(auto [entity, pos, vel]: view.each()) {
// ...
}
// use forward iterators and get only the components of interest
for(auto entity: view) {
auto &vel = view.get<velocity>(entity);
// ...
}
}
int main() {
entt::registry registry;
for(auto i = 0u; i < 10u; ++i) {
const auto entity = registry.create();
registry.emplace<position>(entity, i * 1.f, i * 1.f);
if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
}
update(registry);
}
```
## Motivation
I started developing `EnTT` for the _wrong_ reason: my goal was to design an
entity-component system to beat another well known open source library both in
terms of performance and possibly memory usage.<br/>
In the end, I did it, but it wasn't very satisfying. Actually it wasn't
satisfying at all. The fastest and nothing more, fairly little indeed. When I
realized it, I tried hard to keep intact the great performance of `EnTT` and to
add all the features I wanted to see in *my own library* at the same time.
Nowadays, `EnTT` is finally what I was looking for: still faster than its
_competitors_, lower memory usage in the average case, a really good API and an
amazing set of features. And even more, of course.
## Benchmark
For what it's worth, you'll **never** see me trying to make other projects look
bad or offer dubious comparisons just to make this library seem cooler.<br/>
I leave this activity to others, if they enjoy it (and it seems that some people
actually like it). I prefer to make better use of my time.
If you are interested, you can compile the `benchmark` test in release mode (to
enable compiler optimizations, otherwise it would make little sense) by setting
the `ENTT_BUILD_BENCHMARK` option of `CMak
EnTT，快速可靠的实体组件系统 （ECS）
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EnTT，快速可靠的实体组件系统 （ECS） （272个子文件） 
AUTHORS 503B BUILD.bazel 648B BUILD.bazel 648B MODULE.bazel 271B BUILD.bazel 255B BUILD.bazel 229B MODULE.bazel 186B BUILD.bazel 110B WORKSPACE.bazel 20B WORKSPACE.bazel 19B BUILD.bazel 0B BUILD.bazel 0B .bazelignore 5B .bazeliskrc 22B .bazelrc 472B .bazelrc 32B copts.bzl 397B .clang-format 1KB .clang-tidy 955B JoinPaths.cmake 815B sparse_set.cpp 73KB registry.cpp 72KB storage.cpp 65KB group.cpp 56KB view.cpp 55KB any.cpp 44KB dense_map.cpp 40KB meta_any.cpp 39KB benchmark.cpp 36KB snapshot.cpp 34KB dense_set.cpp 31KB meta_type.cpp 25KB storage_no_instance.cpp 25KB storage_entity.cpp 24KB meta_container.cpp 24KB meta_data.cpp 20KB sigh_mixin.cpp 20KB adjacency_matrix.cpp 17KB meta_func.cpp 17KB meta_context.cpp 15KB organizer.cpp 15KB delegate.cpp 14KB type_traits.cpp 13KB resource_cache.cpp 13KB meta_pointer.cpp 12KB sigh.cpp 11KB meta_utility.cpp 11KB runtime_view.cpp 10KB poly.cpp 10KB memory.cpp 10KB handle.cpp 9KB observer.cpp 9KB flow.cpp 8KB hashed_string.cpp 7KB snapshot.cpp 6KB process.cpp 6KB entity.cpp 6KB meta_ctor.cpp 6KB meta_base.cpp 6KB compressed_pair.cpp 5KB dispatcher.cpp 5KB helper.cpp 5KB scheduler.cpp 5KB type_info.cpp 4KB emitter.cpp 4KB reserved_bits.cpp 4KB entity_copy.cpp 4KB resource.cpp 4KB meta_prop.cpp 3KB algorithm.cpp 3KB locator.cpp 3KB meta_range.cpp 3KB meta_dtor.cpp 2KB tuple.cpp 2KB enum.cpp 2KB main.cpp 2KB meta_conv.cpp 2KB dot.cpp 2KB meta_template.cpp 2KB utility.cpp 2KB meta_handle.cpp 2KB main.cpp 2KB main.cpp 2KB component.cpp 2KB signal_less.cpp 2KB custom_identifier.cpp 1KB storage_utility.cpp 1KB iterator.cpp 1KB plugin.cpp 1KB plugin.cpp 1KB test_package.cpp 1KB lib.cpp 981B ident.cpp 941B main.cpp 931B plugin.cpp 901B main.cpp 843B main.cpp 728B lib.cpp 677B main.cpp 667B family.cpp 655B共 272 条
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