The rules behing Rust functions
4 days ago
- #Rust
- #Functions
- #Closures
- Rust functions and closures can be confusing due to their unique behaviors and traits.
- Functions in Rust are zero-sized values called function items, enabling compiler optimizations like inlining.
- Function pointers allow storing different functions in the same variable but use dynamic dispatch.
- Closures are anonymous functions that can capture variables from their enclosing scope.
- Closures implement one of three traits: FnOnce (moves variables), FnMut (mutates variables), or Fn (reads variables).
- The closure traits form a hierarchy: Fn requires FnMut, which requires FnOnce.
- Non-capturing closures can be coerced into function pointers, while function pointers implement all closure traits.
- Closures are transformed into anonymous structs by the compiler, holding captured variables and implementing the appropriate trait.
- Understanding these concepts helps in mastering Rust's function and closure system.