Trait core::ops::DerefMutExperimental
[-]
[+]
[src]
pub trait DerefMut<Result: ?Sized>: Deref<Result> + ?Sized { fn deref_mut<'a>(&'a mut self) -> &'a mut Result; }
The DerefMut
trait is used to specify the functionality of dereferencing
mutably like *v = 1;
Example
A struct with a single field which is modifiable via dereferencing the struct.
struct DerefMutExample<T> { value: T } impl<T> Deref<T> for DerefMutExample<T> { fn deref<'a>(&'a self) -> &'a T { &self.value } } impl<T> DerefMut<T> for DerefMutExample<T> { fn deref_mut<'a>(&'a mut self) -> &'a mut T { &mut self.value } } fn main() { let mut x = DerefMutExample { value: 'a' }; *x = 'b'; assert_eq!('b', *x); }struct DerefMutExample<T> { value: T } impl<T> Deref<T> for DerefMutExample<T> { fn deref<'a>(&'a self) -> &'a T { &self.value } } impl<T> DerefMut<T> for DerefMutExample<T> { fn deref_mut<'a>(&'a mut self) -> &'a mut T { &mut self.value } } fn main() { let mut x = DerefMutExample { value: 'a' }; *x = 'b'; assert_eq!('b', *x); }
Required Methods
fn deref_mut<'a>(&'a mut self) -> &'a mut Result
The method called to mutably dereference a value