Enum CapabilityState 

pub enum CapabilityState<T> {
    Absent,
    Cancelled,
    Value(T),
}

Presence state preserved by source and binary round trips.

Variants

Absent

Capability has no stored value.

Cancelled

Capability is explicitly cancelled.

Value(T)

Capability has a concrete value.

Implementations

impl<T> CapabilityState<T>

pub const fn is_absent(&self) -> bool

Reports whether the capability is absent.

pub const fn is_cancelled(&self) -> bool

Reports whether the capability is cancelled.

pub fn as_ref(&self) -> CapabilityState<&T>

Borrows a concrete value while preserving presence state.

Trait Implementations

impl<T: Clone> Clone for CapabilityState<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for CapabilityState<T>

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

Formats the value using the given formatter.

impl<T> Default for CapabilityState<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: Eq> Eq for CapabilityState<T>

impl<T: PartialEq> PartialEq for CapabilityState<T>

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<T: PartialEq> StructuralPartialEq for CapabilityState<T>