Trait core::convert::AsMut 1.0.0
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pub trait AsMut<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
AsMutauto-dereferences if the inner type is a reference or a mutable reference (e.g.:foo.as_ref()will work the same iffoohas type&mut Fooor&&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);Run
Required Methods
fn as_mut(&mut self) -> &mut T
Performs the conversion.
Implementors
impl<'a, T: ?Sized, U: ?Sized> AsMut<U> for &'a mut T where
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