as_ref_mut solution

This commit is contained in:
mo8it 2024-07-02 01:35:38 +02:00
parent 8ef5d10da2
commit 825637f32c
2 changed files with 62 additions and 5 deletions

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@ -3,22 +3,21 @@
// https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
// Obtain the number of bytes (not characters) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
// TODO: Add the `AsRef` trait appropriately as a trait bound.
fn byte_counter<T>(arg: T) -> usize {
arg.as_ref().as_bytes().len()
}
// Obtain the number of characters (not bytes) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
// TODO: Add the `AsRef` trait appropriately as a trait bound.
fn char_counter<T>(arg: T) -> usize {
arg.as_ref().chars().count()
}
// Squares a number using as_mut().
// Squares a number using `as_mut()`.
// TODO: Add the appropriate trait bound.
fn num_sq<T>(arg: &mut T) {
// TODO: Implement the function body.
???
}
fn main() {

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@ -1 +1,59 @@
// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
// AsRef and AsMut allow for cheap reference-to-reference conversions. Read more
// about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html and
// https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
// Obtain the number of bytes (not characters) in the given argument.
fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
arg.as_ref().as_bytes().len()
}
// Obtain the number of characters (not bytes) in the given argument.
fn char_counter<T: AsRef<str>>(arg: T) -> usize {
arg.as_ref().chars().count()
}
// Squares a number using `as_mut()`.
fn num_sq<T: AsMut<u32>>(arg: &mut T) {
let arg = arg.as_mut();
*arg = *arg * *arg;
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn different_counts() {
let s = "Café au lait";
assert_ne!(char_counter(s), byte_counter(s));
}
#[test]
fn same_counts() {
let s = "Cafe au lait";
assert_eq!(char_counter(s), byte_counter(s));
}
#[test]
fn different_counts_using_string() {
let s = String::from("Café au lait");
assert_ne!(char_counter(s.clone()), byte_counter(s));
}
#[test]
fn same_counts_using_string() {
let s = String::from("Cafe au lait");
assert_eq!(char_counter(s.clone()), byte_counter(s));
}
#[test]
fn mut_box() {
let mut num: Box<u32> = Box::new(3);
num_sq(&mut num);
assert_eq!(*num, 9);
}
}