Rust Quick Start Guide

Borrowing self

If the self value is immutably borrowed into a function, then that function has read-only access to the value. This is useful in many situations, because it lets us call the function without making a copy of the self value for it to operate on, and without making the compiler ensure that the rules of write access are maintained.

Here's an example of a function that immutably borrows self:

impl Point2D {    // ...    pub fn magnitude(&self) -> f64 {        return (self.x.powi(2) + self.y.powi(2)).sqrt();    }}

This function returns , or in other words, the distance between the point stored in self and the origin of the coordinate system.

The ...