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README.md | 2 years ago |
README.md
box_it
Instructions
Create the following functions:
-
transform_and_save_on_heap
: which accepts a string of numbers separated by spaces. Each number may or may not have a'k'
as a suffix which represents kilograms. The function transforms those numbers into a vector ofu32
, and saves them in the heap usingBox
. -
take_value_ownership
: which accepts the return value fromtransform_and_save_on_heap
, unboxes the value, and returns it.
Expected Functions
pub fn transform_and_save_on_heap(s: String) -> Box<Vec<u32>> {
}
pub fn take_value_ownership(a: Box<Vec<u32>>) -> Vec<u32> {
}
Usage
Here is a program to test your functions
use box_it::*;
fn main() {
let new_str = String::from("5.5k 8.9k 32");
// creating a variable and we save it in the Heap
let a_h = transform_and_save_on_heap(new_str);
println!("Box value : {:?}", &a_h);
println!("size occupied in the stack : {:?} bytes", (std::mem::size_of_val(&a_h)));
let a_b_v = take_value_ownership(a_h);
println!("value : {:?}", &a_b_v);
println!("size occupied in the stack : {:?} bytes", (std::mem::size_of_val(&a_b_v)));
// whenever the box, in this case "a_h", goes out of scope it will be deallocated, freed
}
And its output:
$ cargo run
Box value : [5500, 8900, 32]
size occupied in the stack : 8 bytes
value : [5500, 8900, 32]
size occupied in the stack : 24 bytes
$