Stack and Heap in #Rust

stack_heap.rs

mod stack_heap_example;
use crate::stack_heap_example::stack_and_heap;

#[allow(dead_code)]
#[allow(unused_variables)]

fn main() {
    stack_and_heap();
}

stack_heap_examples.rs

#![allow(dead_code)]

use std::mem;

struct Point {
    x: f64,
    y: f64
}

fn origin() -> Point {
    Point{x:0.0, y: 0.0}
}

pub fn stack_and_heap() {

    let p1 = origin();
    let p2 = Box::new(origin());

    println!("Object p1 takes up {} bytes", mem::size_of_val(&p1));
    // p2 will take less becasue it stores address of the p1
    println!("Object p2 takes up {} bytes", mem::size_of_val(&p2));

    let p3 = *p2;
    println!("Object p3 takes up {} bytes", mem::size_of_val(&p3));

    println!("Object p1 value for x,y {},{} bytes", p1.x, p1.y);
    println!("Object p3 value for x,y {},{} bytes", p3.x, p3.y);



}