Struct NicheRange 

pub struct NicheRange {
    pub offset: u32,
    pub width: u8,
    pub start: u128,
    pub end: u128,
}

A forbidden bit-pattern range within a value of some type.

Reading the width bytes at offset (interpreted as a little-endian unsigned integer) from any valid value will never yield a value in [start, end] (inclusive). Surrounding contexts (e.g. an enclosing enum) can reuse those bit patterns to encode tag information.

Fields

offset: u32

Byte offset within the type where the niche-bearing bytes live.

width: u8

Width of the niche-bearing region, in bytes.

start: u128

Inclusive start of the forbidden range.

end: u128

Inclusive end of the forbidden range.

Implementations

impl NicheRange

pub fn count(&self) -> u128

Number of forbidden bit patterns in this niche.

pub fn max_for_width(width: u8) -> u128

Maximum value representable in width bytes (inclusive).

Trait Implementations

impl Clone for NicheRange

fn clone(&self) -> NicheRange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NicheRange

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

Formats the value using the given formatter.

impl PartialEq for NicheRange

fn eq(&self, other: &NicheRange) -> 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 Copy for NicheRange

impl Eq for NicheRange

impl StructuralPartialEq for NicheRange