Rust

10.5    Solutions

This section provides the code solutions for the practice exercises in Section 10.4. The code is largely self-explanatory; however, we have included comments and additional explanations wherever necessary to enhance understanding.

1. Resolving borrowing conflicts in mutable and immutable references

   fn main() {    let mut some_str = String::from("I am String");    let ref1 = &some_str;    println!("{ref1}");    let ref2 = &mut some_str;    ref2.push_str(" additional information");    println!("{ref2}");}  

2. Resolving lifetimes in function references

   fn identity(a: &i32) -> &i32 {    a}fn main() {    let mut x_ref: Option<&i32> = None;    {        let x = 7;        x_ref = Some(identity(&x));            assert_eq!(*x_ref.unwrap(), 7);    }}  

3. Correcting scope and lifetimes in option ...