feat(as_ref_mut): add AsMut section
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@ -1,6 +1,7 @@
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// AsRef and AsMut allow for cheap reference-to-reference conversions.
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// AsRef and AsMut allow for cheap reference-to-reference conversions.
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// Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
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// Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
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// and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
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// and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
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// Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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// I AM NOT DONE
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@ -16,10 +17,10 @@ fn char_counter<T>(arg: T) -> usize {
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arg.as_ref().chars().count()
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arg.as_ref().chars().count()
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}
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}
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fn main() {
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// Squares a number using AsMut. Add the trait bound as is appropriate and
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let s = "Café au lait";
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// implement the function body.
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println!("{}", char_counter(s));
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fn num_sq<T>(arg: &mut T) {
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println!("{}", byte_counter(s));
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???
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}
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}
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#[cfg(test)]
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#[cfg(test)]
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@ -49,4 +50,11 @@ mod tests {
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let s = String::from("Cafe au lait");
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let s = String::from("Cafe au lait");
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assert_eq!(char_counter(s.clone()), byte_counter(s));
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assert_eq!(char_counter(s.clone()), byte_counter(s));
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}
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}
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#[test]
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fn mult_box() {
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let mut num: Box<u32> = Box::new(3);
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num_sq(&mut num);
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assert_eq!(*num, 9);
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}
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}
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}
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