async-trait

What problem does it solve?

Using async functions in trait objects is not natively supported in stable Rust. This skill explains how the #[async_trait] macro enables object-safe async methods, including Send/Sync bounds and performance implications.

Core Features & Use Cases

• Applies #[async_trait] to both trait definitions and implementations to enable async methods on trait objects.
• Documents and compares dynamic dispatch approaches with and without boxing, including the trade-offs of Send vs non-Send variants.
• Provides practical usage patterns for registries, plugins, and dependency-injection scenarios in Rust.

Quick Start

Annotate a trait and its impl with #[async_trait] and start calling async methods on trait objects.