Struct WangHash 

#[repr(C)]
pub struct WangHash {
    pub hash: u32,
    pub t_anchor: u32,
}

One anchor-target landmark pair packed into a 32-bit hash.

The type is #[repr(C)] and implements bytemuck::Pod, so it can be safely cast to/from &[u8] for zero-copy persistence (mmap, flat files) or transmitted across a C FFI boundary. Layout is two native-endian u32 fields: hash followed by t_anchor (8 bytes total, no padding).

Hash bit layout (MSB → LSB)

Bits	Field	Meaning
31 – 23	f_a_q	Anchor frequency (9 bits, 512-bucket quantised)
22 – 14	f_b_q	Target frequency (same quantisation)
13 – 0	Δt	Frame distance anchor→target (1 ..= 16 383)

Decode with shifts: let f_a = hash >> 23; let f_b = (hash >> 14) & 0x1FF;

Fields

hash: u32

32-bit hash: f_a_q (9) | f_b_q (9) | Δt (14), MSB first.

t_anchor: u32

STFT frame index of the anchor peak (0-based, monotonically increasing within a fingerprint).

Trait Implementations

impl Clone for WangHash

fn clone(&self) -> WangHash

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WangHash

impl Debug for WangHash

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

Formats the value using the given formatter.

impl Eq for WangHash

impl Hash for WangHash

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 PartialEq for WangHash

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

Equality operator ==.

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

Inequality operator !=.

impl Pod for WangHash

impl StructuralPartialEq for WangHash

impl Zeroable for WangHash

fn zeroed() -> Self

Calls zeroed.