std::convert::AsMut

Trait std::convert::AsMut

pub trait AsMut<T> where    T: ?Sized, {
    fn as_mut(&mut self) -> &mut T;
}

A cheap, mutable reference-to-mutable reference conversion.

This trait is similar to AsRef but used for converting between mutable references.

Note: this trait must not fail. If the conversion can fail, use a dedicated method which returns an Option<T> or a Result<T, E>.

Generic Implementations

• AsMut auto-dereferences if the inner type is a reference or a mutable reference (e.g.: foo.as_ref() will work the same if foo has type &mut Foo or &&mut Foo)

Examples

Box<T> implements AsMut<T>:

fn add_one<T: AsMut<u64>>(num: &mut T) {
    *num.as_mut() += 1;
}

let mut boxed_num = Box::new(0);
add_one(&mut boxed_num);
assert_eq!(*boxed_num, 1);

Required Methods

Implementors

• impl<T> AsMut<Vec<T>> for Vec<T>
• impl<T> AsMut<[T]> for Vec<T>
• impl<T> AsMut<T> for Box<T> where
    T: ?Sized, 
• impl<'a, T, U> AsMut<U> for &'a mut T where
    T: AsMut<U> + ?Sized,
    U: ?Sized, 
• impl<T> AsMut<[T]> for [T]
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