Struct Ppm 

pub struct Ppm(/* private fields */);

A ratio in [0, 1] expressed as fixed-point parts-per-million.

Authoritative policy thresholds must not be floats: 0.25 is not representable identically in every language/serializer, and a threshold comparison that differs by one ULP is a different kernel decision. Ppm(250_000) is exact everywhere.

Ratios greater than 1.0 (e.g. an over-provisioning multiplier) need a distinct type with its own bound; deliberately not invented here before a real callsite exists.

Implementations

impl Ppm

pub const ZERO: Self

pub const ONE: Self

pub const MAX_PPM: u32 = 1_000_000

pub fn new(parts_per_million: u32) -> Result<Self, WireScalarError>

pub const fn get(self) -> u32

pub fn as_ratio(self) -> f64

Observation/diagnostic projection only — never feed this back into a branch.

pub fn from_ratio(ratio: f64) -> Result<Self, WireScalarError>

Convert a host-supplied ratio at the boundary (rounding to the nearest ppm). The float stops here: everything downstream compares integers.

impl Ppm

pub const fn from_ppm_const(parts_per_million: u32) -> Self

const-constructible ppm for compile-time baselines.

Ppm::new returns a Result and therefore cannot appear in a const initialiser, but the kernel’s default policy table is a compile-time constant. Values above Ppm::MAX_PPM saturate rather than panic: a default table that aborts the process at startup would turn a typo into an outage, and saturation is still a legal ratio.

Trait Implementations

impl Clone for Ppm

fn clone(&self) -> Ppm

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Ppm

impl Debug for Ppm

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

Formats the value using the given formatter.

impl Default for Ppm

fn default() -> Ppm

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Ppm

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Eq for Ppm

impl Hash for Ppm

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 Ppm

fn cmp(&self, other: &Ppm) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Ppm

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Ppm

fn partial_cmp(&self, other: &Ppm) -> 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 Serialize for Ppm

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Ppm