Struct CowBox 

pub struct CowBox<T> { /* private fields */ }

A copy-on-write smart pointer.

CowBox<T> wraps a value that is shared (read-only) until a mutation is requested, at which point it copies the value to create a unique owner.

Implementations

impl<T: Clone> CowBox<T>

pub fn new(value: T) -> Self

Create a new CowBox.

pub fn as_ref(&self) -> &T

Get a read-only reference.

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

Get a mutable reference, copying if necessary.

pub fn was_copied(&self) -> bool

Check if a COW copy has been made.

pub fn is_unique(&self) -> bool

Check if this is the unique owner.

pub fn into_owned(self) -> T

Unwrap the value, cloning if not unique.

Trait Implementations

impl<T: Debug> Debug for CowBox<T>

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

Formats the value using the given formatter.

impl<T: Clone + PartialEq> PartialEq for CowBox<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<T: Clone + Eq> Eq for CowBox<T>