ENtt

EnTT is a header-only, single-header, Entity Component System (ECS) library written in modern C++. It is designed for high performance and ease of use, making it a popular choice for game development and other performance-critical applications. EnTT aims to provide a flexible and powerful way to manage game entities and their associated data.

The core concept of EnTT revolves around entities, components, and systems. Entities are typically simple identifiers, often represented by an integer type. Components are plain old data structures that hold the attributes of an entity. Systems are functions or classes that operate on entities possessing specific sets of components. This separation of data and logic allows for flexible and efficient data management.

EnTT's design emphasizes compile-time polymorphism and zero-overhead abstractions, meaning that the ECS logic adds minimal to no runtime cost. It leverages C++ templates extensively to achieve this. The library provides a rich API for creating and destroying entities, attaching and detaching components, and querying entities based on their components. It also includes features for event handling and group-based processing.

Key advantages of using EnTT include its performance, which is often comparable to hand-optimized C code, its small footprint due to being header-only, and its modern C++ features. It promotes a data-oriented design paradigm, which can lead to better cache utilization and overall application performance. EnTT is actively maintained and has a growing community.