Struct lucia_lang::gc::RefMut

pub struct RefMut<'a, T: ?Sized + 'a> { /* private fields */ }

A wrapper type for a mutably borrowed value from a RefCell<T>.

Implementations

impl<'a, T: ?Sized> RefMut<'a, T>

pub fn map<U: ?Sized, F>(orig: RefMut<'a, T>, f: F) -> RefMut<'a, U>where F: FnOnce(&mut T) -> &mut U,

Makes a new RefMut for a component of the borrowed data, e.g., an enum variant.

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

This is an associated function that needs to be used as RefMut::map(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.

pub fn filter_map<U: ?Sized, F>( orig: RefMut<'a, T>, f: F ) -> Result<RefMut<'a, U>, Self>where F: FnOnce(&mut T) -> Option<&mut U>,

Makes a new RefMut for an optional component of the borrowed data. The original guard is returned as an Err(..) if the closure returns None.

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

This is an associated function that needs to be used as RefMut::filter_map(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.

pub fn map_split<U: ?Sized, V: ?Sized, F>( orig: RefMut<'a, T>, f: F ) -> (RefMut<'a, U>, RefMut<'a, V>)where F: FnOnce(&mut T) -> (&mut U, &mut V),

Splits a RefMut into multiple RefMuts for different components of the borrowed data.

The underlying RefCell will remain mutably borrowed until both returned RefMuts go out of scope.

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

This is an associated function that needs to be used as RefMut::map_split(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.

Trait Implementations

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

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

Formats the value using the given formatter.

impl<T: ?Sized> Deref for RefMut<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: ?Sized> DerefMut for RefMut<'_, T>

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

Mutably dereferences the value.

impl<T: ?Sized + Display> Display for RefMut<'_, T>

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

Formats the value using the given formatter.