Enum Distribution 

pub enum Distribution {
    TernaryFixed(usize),
    TernaryProb(f64),
    BinaryFixed(usize),
    BinaryProb(f64),
    BinaryBlock(usize),
    ZERO,
    NONE,
}

Describes the probability distribution used to sample secret-key coefficients.

Each variant encodes either a fixed Hamming weight or a per-coefficient probability. The enum is serialised as a single little-endian u64 word via write_to / read_from.

For probabilistic variants the f64 payload is stored with a precision loss below 2^-44 (8 least-significant mantissa bits are discarded to fit the tag byte).

Variants

TernaryFixed(usize)

Ternary in {-1, 0, 1} with exactly h non-zero coefficients.

TernaryProb(f64)

Ternary in {-1, 0, 1} where each coefficient is non-zero with probability p.

BinaryFixed(usize)

Binary in {0, 1} with exactly h ones.

BinaryProb(f64)

Binary in {0, 1} where each coefficient is 1 with probability p.

BinaryBlock(usize)

Binary in {0, 1} split into blocks of size 2^k, with one 1 per block.

ZERO

All-zero secret (debug / testing only).

NONE

Uninitialized — no distribution has been set yet.

Implementations

impl Distribution

pub fn write_to<W: Write>(&self, writer: &mut W) -> Result<()>

Serialises this distribution as a single little-endian u64 word.

The top byte carries a variant tag; the lower 56 bits carry either a usize payload (for fixed/block variants) or a truncated f64 (for probabilistic variants).

pub fn read_from<R: Read>(reader: &mut R) -> Result<Self>

Deserialises a Distribution from a single little-endian u64 word.

Returns std::io::ErrorKind::InvalidData if the tag byte is unrecognised.

Trait Implementations

impl Clone for Distribution

fn clone(&self) -> Distribution

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Distribution

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

Formats the value using the given formatter.

impl PartialEq for Distribution

fn eq(&self, other: &Self) -> 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 Distribution

impl Eq for Distribution