Rust by Example

Mutability

Mutability of data can be changed when ownership is transferred.

fn main() {

let immutable_box = Box::new(5u32);

println!("immutable_box contains {}", immutable_box);

// Mutability error

//*immutable_box = 4;

// *Move* the box, changing the ownership (and mutability)

let mut mutable_box = immutable_box;

println!("mutable_box contains {}", mutable_box);

// Modify the contents of the box

*mutable_box = 4;

println!("mutable_box now contains {}", mutable_box);

}

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