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laazy 2024-03-23 23:24:12 +08:00
parent a513d90cff
commit 21b4dd14b6
1 changed files with 5 additions and 7 deletions
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10
exercises/23_conversions/as_ref_mut.rs
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@ -7,12 +7,10 @@
// Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a // Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a
// hint. // hint.
// I AM NOT DONE use std::ops::DerefMut;
use std::ops::Mul;
// Obtain the number of bytes (not characters) in the given argument. // Obtain the number of bytes (not characters) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
fn byte_counter<T>(arg: T) -> usize fn byte_counter<T>(arg: T) -> usize
where T: AsRef<str> where T: AsRef<str>
{ {
@ -20,7 +18,6 @@ where T: AsRef<str>
} }
// Obtain the number of characters (not bytes) in the given argument. // Obtain the number of characters (not bytes) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
fn char_counter<T>(arg: T) -> usize fn char_counter<T>(arg: T) -> usize
where T: AsRef<str> where T: AsRef<str>
{ {
@ -30,10 +27,11 @@ where T: AsRef<str>
// Squares a number using as_mut(). // Squares a number using as_mut().
// TODO: Add the appropriate trait bound. // TODO: Add the appropriate trait bound.
fn num_sq<T>(arg: &mut T) fn num_sq<T>(arg: &mut T)
where T: for<'a> AsMut<&'a mut Box<u32>> + for<'a> Mul<&'a mut T, Output = T>// + std::ops::MulAssign<&mut Box<u32>> // where T: DerefMut<Target = u32>,
where T: AsMut<u32>
{ {
// TODO: Implement the function body. // TODO: Implement the function body.
*arg = (*arg) * arg; *arg.as_mut() = *arg.as_mut() * *arg.as_mut();
} }
#[cfg(test)] #[cfg(test)]