Enum Scope 

pub enum Scope<T>
where
    T: Ord + Clone,
{
    All,
    Only(BTreeSet<T>),
}

A set-valued authority axis: either unrestricted (All, the top of this axis) or exactly the listed items.

Ordered so that Only(s) ⊑ All for every s, and Only(a) ⊑ Only(b) ⟺ a ⊆ b. The meet is intersection, with All acting as the identity.

Variants

All

Unrestricted — authorizes every item. The ⊤ of this axis.

Only(BTreeSet<T>)

Authorizes exactly the items in the set (canonical: a BTreeSet).

Implementations

impl<T> Scope<T>

where T: Ord + Clone,

pub fn top() -> Scope<T>

The top of this axis (All, unrestricted).

pub fn none() -> Scope<T>

The empty authority on this axis — authorizes nothing.

pub fn only<I>(items: I) -> Scope<T>

where I: IntoIterator<Item = T>,

Build a bounded scope from an iterator of items.

pub fn leq(&self, other: &Scope<T>) -> bool

self ⊑ other — does self authorize no more than other?

pub fn meet(&self, other: &Scope<T>) -> Scope<T>

self ⊓ other — the greatest lower bound (most permissive scope still ⊑ both). All is the identity; otherwise intersection.

Trait Implementations

impl<T> Clone for Scope<T>

where T: Clone + Ord,

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Scope<T>

where T: Debug + Ord + Clone,

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

Formats the value using the given formatter.

impl<'de, T> Deserialize<'de> for Scope<T>

where T: Ord + Clone + Deserialize<'de>,

fn deserialize<__D>( __deserializer: __D, ) -> Result<Scope<T>, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Eq for Scope<T>

where T: Eq + Ord + Clone,

impl<T> PartialEq for Scope<T>

where T: PartialEq + Ord + Clone,

fn eq(&self, other: &Scope<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Ord + Clone> ScopeExt<T> for Scope<T>

fn permits(&self, item: &T) -> bool

Does this scope authorize item?

impl<T> Serialize for Scope<T>

where T: Ord + Clone + Serialize,

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> StructuralPartialEq for Scope<T>

where T: PartialEq + Ord + Clone,