Struct RefVal

pub struct RefVal<'b, T> { /* private fields */ }

A type containing a value that contains a borrowed reference to a value from a RefCell<T>.

See the module-level documentation for more.

Implementations

impl<'b, T> RefVal<'b, T>

pub fn clone(orig: &RefVal<'b, T>) -> RefVal<'b, T>

where T: Clone,

Copies a RefVal.

The RefCell is already immutably borrowed, so this cannot fail.

This is an associated function that needs to be used as Ref::clone(...). A Clone implementation or a method would interfere with the widespread use of r.borrow().clone() to clone the contents of a RefCell.

pub fn map<U: Sized, F>(orig: RefVal<'b, T>, f: F) -> RefVal<'b, U>

where F: FnOnce(T) -> U,

Make a new RefVal from the another RefVal.

The RefCell is already immutably borrowed, so this operation cannot fail.

Trait Implementations

impl<T: Sized + Debug> Debug for RefVal<'_, T>

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

Formats the value using the given formatter.

impl<T> Deref for RefVal<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for RefVal<'_, T>

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

Mutably dereferences the value.

impl<T: Display> Display for RefVal<'_, T>

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

Formats the value using the given formatter.