Learning Rust

Borrowing in Rust

Way back in Chapter 2, Variables, we referred to something known as a reference and it was said to be a copy of the pointer to some memory location. This is a big part of what is meant by borrowing in Rust.

In our preceding example, we can make use of borrowing. Our code for it is as follows:

fn sumprod(v1: &Vec<i32>, v2: &Vec<i32>) -> i32 
{ 
    let sum = v1.iter().fold(0i32, |a, &b| a + b); 
    let product = v2.iter().fold(1i32, |a, &b| a * b); 
    return sum + product;  
} 
 
fn main()  
{ 
    let vecone = vec![2,3,5]; 
    let vectwo = vec![3,5];  
    let ans = sumprod(&vecone, &vectwo);  
    println!("ans = {}", ans); 
} 

The code for this section can be found in the 08/handback folder which can be found in the supporting code bundle of this book.

We will ...