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Advanced

Closure​

fn  add_one_v1   (x: u32) -> u32 { x + 1 }
let add_one_v2 = |x: u32| -> u32 { x + 1 };
let add_one_v3 = |x|             { x + 1 };
let add_one_v4 = |x|               x + 1  ;

Storing closures using Generic and Fn Traits We can create a struct that will hold the closure and the resulting value of calling the closure. The struct will execute the closure only if we need the resulting value, and it will cache the resulting value.

Iterator​

Iterator trait and next method.

Smart Pointers​

  • Box
  • Deref trait and Drop trait