Enum Cached 

pub enum Cached<T>
where
    T: Clone + Debug,
{
    Empty,
    Unused(T),
    Used(T),
}

Helper for caching a value when the value is optionally present in the ‘unused’ state.

Variants

Empty

Unused(T)

Used(T)

Implementations

impl<T> Cached<T>

where T: Clone + Debug,

pub const fn get(&self) -> Option<&T>

Gets the value if in state Self::Used.

pub fn get_mut(&mut self) -> Option<&mut T>

Gets the value mutably if in state Self::Used.

pub const fn is_unused(&self) -> bool

Checks if the value is empty or unused.

pub const fn is_used(&self) -> bool

Checks if the value is used (i.e. cached for access).

pub const fn is_invalidated(&self) -> bool

Checks if the value was previously cached but has been invalidated.

pub fn take_unused(&mut self) -> Option<T>

Takes the buffered value if in state Self::Unused.

pub fn take_used(&mut self) -> Option<T>

Takes the cached value if in state Self::Used.

pub fn set_unused(&mut self)

Moves the value from Self::Used to Self::Unused.

pub fn set_used(&mut self, val: T)

Sets the value to Self::Used.

Trait Implementations

impl<T> Clone for Cached<T>

where T: Clone + Debug,

fn clone(&self) -> Cached<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for Cached<T>

where T: Debug + Clone,

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

Formats the value using the given formatter.