std​::ops

Traits

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Trait std::ops::DerefMut[src]

pub trait DerefMut<Result>: Deref<Result> {
    fn deref_mut<Result>(&'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<Result>(&'a mut self) -> &'a mut Result

The method called to mutably dereference a value

Implementors