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Rust 1.36.0
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Choosing your Guarantees

There is a new edition of the book and this is an old link.

Smart pointers are data structures that act like a pointer, but they also have additional metadata and capabilities. The different smart pointers defined in Rust’s standard library provide extra functionality beyond what references provide.

let b = Box::new(5);
println!("b = {}", b);Run

Here are the relevant sections in the new and old books: