Struct Revision 

pub struct Revision(pub u64);

A policy record’s own revision, for detecting a stale observation.

Policies are independent records and a poll only ever sees a random point of that set — never a snapshot with a version of its own — so a later poll can observe an older copy of one particular policy than a previous poll already applied (a slow replica, a retried request racing a fresher one, in any order the transport permits). Applying that older copy over the newer one would silently revert an operator’s edit, and in a deny-only system a reversion is a widening — the one direction every other property in this crate exists to prevent.

This crate does not perform that refusal itself: comparing two observations of what is nominally the same policy over time is exactly the kind of state this crate has no I/O and no polling to hold — see the crate root’s “What is deliberately not here”. Revision is here because the type that carries one policy’s declaration is where the value naturally lives; a loader reading two observations of a policy compares their Revisions and refuses to apply the lesser one.

Tuple Fields

0: u64

Trait Implementations

impl Clone for Revision

fn clone(&self) -> Revision

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Revision

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

Formats the value using the given formatter.

impl Hash for Revision

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Revision

fn cmp(&self, other: &Revision) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Revision

fn eq(&self, other: &Revision) -> 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 PartialOrd for Revision

fn partial_cmp(&self, other: &Revision) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Revision

impl Eq for Revision

impl StructuralPartialEq for Revision