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Rust · Concept

Generics

Rust generics let one function or type work with multiple concrete types. Declare type parameters inside angle brackets, commonly using names such as T, to reduce duplicated code.

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Syntax

fn foo<T>(arg: T) { ... }
struct SingleGen<T>(T);

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  • Option<T>
  • Vec<T>
  • HashMap<K, V>
  • Result<T, E>
  • type parameters

Source: Generics - Rust By Example. Checked 2026-11-03.