How to integrate EnTT with CMake in my project?

Link your target to the EnTT::EnTT alias in CMake; the README details various methods including find_package or add_subdirectory, with options like ENTT_INSTALL for control.

EnTT vs Unity ECS: which should I use for a C++ game?

EnTT is a header-only C++ library offering full native control and performance, ideal for custom engines. Unity ECS is part of the Unity ecosystem with C# focus, better for cross-platform projects using Unity's editor.

Does EnTT support serialization for saving game states?

EnTT's runtime reflection system can aid serialization, but you must implement custom logic using it or external libraries; it doesn't provide built-in serialization out of the box.

What are the real-world performance benchmarks for EnTT?

The README references community benchmarks and encourages compiling the benchmark test yourself, noting EnTT is designed for speed and often outperforms competitors in data-oriented tasks.

Can I use EnTT for non-game applications like simulations?

Yes, its data-oriented design makes it suitable for simulations, GUI systems, or any app requiring efficient entity management, as highlighted in the philosophy and feature list.

How to handle component dependencies and systems in EnTT?

Use views and groups for iteration, and leverage the scheduler for system ordering; the README's code example shows basic usage, but advanced patterns require consulting the wiki or documentation.

Open-Awesome

EnTT

MITC++v4.0.0

A header-only, fast, and reliable entity-component system (ECS) library for modern C++ game development.

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13.1k stars1.1k forks0 contributors

What is EnTT?

EnTT is a header-only C++ library that provides a fast and reliable entity-component system (ECS) for game development and other data-oriented applications. It solves the problem of managing complex game object state efficiently by decoupling data (components) from behavior (systems), enabling high-performance iteration and memory locality.

Target Audience

C++ developers building games, simulations, or other real-time applications that require efficient data management and entity architecture, particularly those using modern C++ (C++20 or later).

Value Proposition

Developers choose EnTT for its exceptional performance, memory efficiency, and comprehensive feature set—all in a header-only, easy-to-integrate package. Its proven adoption in major projects like Minecraft and ArcGIS SDKs underscores its reliability and scalability.

Overview

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

Use Cases

Best For

Building high-performance game engines with data-oriented design
Implementing entity-component architectures in modern C++ projects
Managing complex game object state with optimal memory usage
Adding runtime reflection to C++ applications without macros
Scheduling cooperative tasks and processes in games
Developing simulations requiring efficient entity iteration

Not Ideal For

Projects stuck on C++ standards older than C++20, as EnTT mandates modern compiler support
Teams seeking an all-in-one game engine with built-in graphics, physics, and editor tools
Developers who prefer inheritance-based object models over data-oriented ECS architecture
Rapid prototyping scenarios where drag-and-drop or scripting-heavy engines like Unity are more efficient

Pros & Cons

Pros

Header-Only Integration

EnTT is entirely header-only, allowing seamless inclusion with just a single file and no complex build steps, as emphasized in the README's integration section.

Proven High Performance

Benchmarks and adoption in demanding projects like Minecraft and ArcGIS SDKs validate its speed and memory efficiency for real-time applications, with a 'pay for what you use' philosophy.

Comprehensive Feature Set

Beyond core ECS, it offers runtime reflection, resource management, schedulers, and signal handling, providing a rich toolkit for game programming and more.

Modern C++ API

Leverages C++20 features for an intuitive, type-safe API that encourages best practices, with clean code examples in the README demonstrating ease of use.

Cons

Strict C++20 Requirement

The library requires a full-featured C++20 compiler, excluding legacy projects or environments with older toolchains, as stated in the requirements section.

No Built-in Engine Features

As a pure ECS library, it lacks graphics rendering, physics, or audio systems, forcing developers to integrate and maintain additional third-party libraries for a complete game engine.

Dense, Code-Focused Documentation

Documentation is primarily in-code via doxygen, which the README notes is for 'the brave,' making it less accessible for beginners compared to tutorial-driven guides.

Frequently Asked Questions

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