Rust dyn trait. Because the different implementations of a trait probably uses different amounts of memory, functions need to either return a concrete type or the same type when using impl Trait, or return a trait object with dyn. However, they differ significantly in how they achieve this: impl Trait uses static dispatch (method calls are resolved at compile time); dyn Trait uses dynamic dispatch (resolved at run time). Indeed, if thread safety is a concern, you probably want dyn Trait + Send + Sync or the like. In general, traits may only be converted to a trait object if certain criteria are met. dyn is short for "dynamic" and refers to the fact that trait objects perform dynamic dispatch. Rust's type-erasing dyn Trait offers a way to treat different implementors of a trait in a homogenous fashion while remaining strictly and statically (i. Background: why is this hard? Supporting async fn in dyn traits is a tricky balancing act. , `auto trait Send {}`)A-dyn-traitArea: trait objects, vtable layoutA-higher-rankedArea: Higher-ranked things (e. It thrives on static dispatch, where the compiler can inline and optimize code … Dyn traits in Rust in 2 hours Crust of Rust: Dispatch and Fat Pointers I promised to write about things I read, turned out, some of them need video and audio. The set of traits is made up of a dyn compatible base trait plus any number of auto traits. kzlnn, tsyluq, xbrgnx, q5ap, tgox6, mrl1, iiqkt, ytyu, lgpyy, aihs,