Enum MutHandle

pub enum MutHandle<'a, T> {
    Borrowed(&'a mut T),
    Owned(T),
}

A mutable access abstraction over a value that may be either borrowed or owned.

MutHandle represents the idea that mutation is the primary capability, while ownership is incidental. It allows code to operate on a value uniformly without caring whether that value is owned or borrowed.

The key semantic guarantee is:

• mutation is always permitted
• ownership is never implicitly changed or upgraded

This makes it suitable for contexts where:

• mutation must be expressed generically
• ownership should remain explicit and stable
• no hidden allocation or cloning is allowed

Conceptually, it models a “mutable view” over data with a fixed ownership mode, enabling APIs to focus on behavior (mutation) rather than representation (ownership).

Variants

Borrowed(&'a mut T)

Owned(T)

Trait Implementations

impl<'a, T> AsMut<T> for MutHandle<'a, T>

fn as_mut(&mut self) -> &mut T

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'a, T> AsRef<T> for MutHandle<'a, T>

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<'a, T> Borrow<T> for MutHandle<'a, T>

fn borrow(&self) -> &T

Immutably borrows from an owned value.

impl<'a, T> BorrowMut<T> for MutHandle<'a, T>

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value.

impl<'a, T: Debug> Debug for MutHandle<'a, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, T: Default> Default for MutHandle<'a, T>

fn default() -> Self

Returns the “default value” for a type.

impl<'a, T> Deref for MutHandle<'a, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<'a, T> DerefMut for MutHandle<'a, T>

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<'a, T: Clone> From<&'a T> for MutHandle<'a, T>

fn from(v: &'a T) -> Self

Converts to this type from the input type.

impl<'a, T> From<&'a mut T> for MutHandle<'a, T>

fn from(v: &'a mut T) -> Self

Converts to this type from the input type.

impl<'a, T: Clone> From<Cow<'a, T>> for MutHandle<'a, T>

fn from(c: Cow<'a, T>) -> Self

Converts to this type from the input type.

impl<'a, T: Clone> From<MutHandle<'a, T>> for Cow<'a, T>

fn from(v: MutHandle<'a, T>) -> Self

Converts to this type from the input type.

impl<'a, T> From<T> for MutHandle<'a, T>

fn from(v: T) -> Self

Converts to this type from the input type.

impl<'a, T: Hash> Hash for MutHandle<'a, T>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a, T: Ord> Ord for MutHandle<'a, T>

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<'a, T: PartialEq> PartialEq for MutHandle<'a, T>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a, T: PartialOrd> PartialOrd for MutHandle<'a, T>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a, T: Eq> Eq for MutHandle<'a, T>