Struct ReserveFraction 

pub struct ReserveFraction { /* private fields */ }

An exact dyadic reserve fraction delta = 1 / 2^d.

The exponent is stored directly so capacity calculations never depend on floating-point rounding.

Implementations

impl ReserveFraction

pub const DEFAULT: Self

The default reserve fraction 1/8.

pub const fn from_exponent(exponent: u32) -> Result<Self, ReserveFractionError>

Creates delta = 1 / 2^exponent.

Errors

Returns ReserveFractionError::ExponentZero for exponent == 0, which would represent delta = 1 rather than a fraction below one.

pub const fn exponent(self) -> u32

Returns d from the exact representation delta = 1 / 2^d.

pub const fn floor_reserved(self, n: usize) -> usize

Returns floor(delta * n) using exact integer arithmetic.

pub const fn floor_half_reserved(self, n: usize) -> usize

Returns floor(delta * n / 2) using exact integer arithmetic.

pub const fn as_f64(self) -> Option<f64>

Returns the exact f64 representation when one exists.

Binary64 represents inverse powers of two through 2^-1074; larger exponents return None rather than underflowing to zero.

Trait Implementations

impl Clone for ReserveFraction

fn clone(&self) -> ReserveFraction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ReserveFraction

impl Debug for ReserveFraction

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

Formats the value using the given formatter.

impl Eq for ReserveFraction

impl Hash for ReserveFraction

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 ReserveFraction

fn cmp(&self, other: &ReserveFraction) -> 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 ReserveFraction

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for ReserveFraction

fn partial_cmp(&self, other: &ReserveFraction) -> 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 StructuralPartialEq for ReserveFraction

impl TryFrom<f64> for ReserveFraction

type Error = ReserveFractionError

The type returned in the event of a conversion error.

fn try_from(value: f64) -> Result<Self, Self::Error>

Performs the conversion.