1.0.0[−][src]Trait std::convert::AsMut
Used to do a cheap mutable-to-mutable reference conversion.
This trait is similar to AsRef
but used for converting between mutable
references. If you need to do a costly conversion it is better to
implement From
with type &mut T
or write a custom function.
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 mutable reference (e.g.:foo.as_mut()
will work the same iffoo
has type&mut Foo
or&mut &mut Foo
)
Examples
Using AsMut
as trait bound for a generic function we can accept all mutable references
that can be converted to type &mut T
. Because Box<T>
implements AsMut<T>
we can
write a function add_one
that takes all arguments that can be converted to &mut u64
.
Because Box<T>
implements AsMut<T>
, add_one
accepts arguments of type
&mut Box<u64>
as well:
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
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impl<'_, T, U> AsMut<U> for &'_ mut T where
T: AsMut<U> + ?Sized,
U: ?Sized,
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T: AsMut<U> + ?Sized,
U: ?Sized,
impl<T> AsMut<[T]> for [T; 0]
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impl<T> AsMut<[T]> for [T; 1]
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impl<T> AsMut<[T]> for [T; 2]
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impl<T> AsMut<[T]> for [T; 3]
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impl<T> AsMut<[T]> for [T; 4]
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impl<T> AsMut<[T]> for [T; 5]
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impl<T> AsMut<[T]> for [T; 6]
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impl<T> AsMut<[T]> for [T; 7]
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impl<T> AsMut<[T]> for [T; 8]
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impl<T> AsMut<[T]> for [T; 9]
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impl<T> AsMut<[T]> for [T; 10]
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impl<T> AsMut<[T]> for [T; 11]
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impl<T> AsMut<[T]> for [T; 12]
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impl<T> AsMut<[T]> for [T; 13]
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impl<T> AsMut<[T]> for [T; 14]
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impl<T> AsMut<[T]> for [T; 15]
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impl<T> AsMut<[T]> for [T; 16]
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impl<T> AsMut<[T]> for [T; 17]
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impl<T> AsMut<[T]> for [T; 18]
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impl<T> AsMut<[T]> for [T; 19]
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impl<T> AsMut<[T]> for [T; 20]
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impl<T> AsMut<[T]> for [T; 21]
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impl<T> AsMut<[T]> for [T; 22]
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impl<T> AsMut<[T]> for [T; 23]
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impl<T> AsMut<[T]> for [T; 24]
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impl<T> AsMut<[T]> for [T; 25]
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impl<T> AsMut<[T]> for [T; 26]
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impl<T> AsMut<[T]> for [T; 27]
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impl<T> AsMut<[T]> for [T; 28]
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impl<T> AsMut<[T]> for [T; 29]
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impl<T> AsMut<[T]> for [T; 30]
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impl<T> AsMut<[T]> for [T; 31]
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impl<T> AsMut<[T]> for [T; 32]
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impl<T> AsMut<[T]> for [T]
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impl<T> AsMut<[T]> for Vec<T>
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impl<T> AsMut<Vec<T>> for Vec<T>
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impl<T> AsMut<T> for Box<T> where
T: ?Sized,
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T: ?Sized,