Enum Dereference 

pub enum Dereference<'a, T> {
    NoSuchEntity,
    Residual(Expr),
    Data(&'a T),
}

Results from dereferencing values from the Entity Store

Variants

NoSuchEntity

No entity with the dereferenced EntityUID exists. This is an error.

Residual(Expr)

The entity store has returned a residual

Data(&'a T)

The entity store has returned the requested data.

Implementations

impl<'a, T> Dereference<'a, T>

where T: Debug,

pub fn unwrap(self) -> &'a T

Returns the contained Data value, consuming the self value.

Because this function may panic, its use is generally discouraged. Instead, prefer to use pattern matching and handle the NoSuchEntity and Residual cases explicitly.

Panics

Panics if the self value is not Data.

pub fn expect(self, msg: &str) -> &'a T

Returns the contained Data value, consuming the self value.

Because this function may panic, its use is generally discouraged. Instead, prefer to use pattern matching and handle the NoSuchEntity and Residual cases explicitly.

Panics

Panics if the self value is not Data.

Trait Implementations

impl<'a, T: Clone> Clone for Dereference<'a, T>

fn clone(&self) -> Dereference<'a, T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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

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

Formats the value using the given formatter.