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Understanding Ownership Rules

Ownership is Rust's core memory safety model, replacing garbage collection.

Key Ownership Rules

  • Each value in Rust has a variable that's its owner.
  • There can only be one owner at a time.
  • When the owner goes out of scope, the value is dropped.

Ownership Transfer

let s1 = String::from("hello");
let s2 = s1; // s1 is moved to s2
// println!("{}", s1); // Error: s1 is no longer valid

This prevents double free errors.

Cloning

To deeply copy data:

let s1 = String::from("hello");
let s2 = s1.clone(); // s1 is still valid
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