Struct FixedBytes 

pub struct FixedBytes<const N: usize> { /* private fields */ }

Generic fixed-size byte array with const generic size.

Provides a type-safe wrapper around fixed-size arrays with useful utility methods for encoding, comparison, and serialization.

Type Safety

Different sizes create incompatible types at compile time:

let hash32 = FixedBytes::<32>::new([0u8; 32]);
let hash64 = FixedBytes::<64>::new([0u8; 64]);
// hash32 == hash64; // Compile error: different types

Implementations

impl<const N: usize> FixedBytes<N>

pub const fn new(bytes: [u8; N]) -> Self

Create a new fixed-size byte array.

pub fn from_slice(slice: &[u8]) -> Option<Self>

Create from a byte slice. Returns None if the slice length doesn’t match.

Example

let bytes = &[1, 2, 3, 4];
let fixed = FixedBytes::<4>::from_slice(bytes).unwrap();
assert_eq!(fixed.as_bytes(), bytes);

pub fn from_hex(hex: &str) -> Result<Self, String>

Create from a hexadecimal string.

Errors

Returns error if the hex string is invalid or has wrong length.

pub const fn as_bytes(&self) -> &[u8; N]

Get the byte array as a slice.

pub fn as_bytes_mut(&mut self) -> &mut [u8; N]

Get the byte array as a mutable slice.

pub fn to_hex(&self) -> String

Convert to hexadecimal string.

pub const fn size() -> usize

Get the size of this array type at compile time.

pub fn is_zero(&self) -> bool

Check if all bytes are zero.

pub const fn zero() -> Self

Create a zeroed array.

Trait Implementations

impl<const N: usize> AsMut<[u8]> for FixedBytes<N>

fn as_mut(&mut self) -> &mut [u8]

Converts this type into a mutable reference of the (usually inferred) input type.

impl<const N: usize> AsRef<[u8]> for FixedBytes<N>

fn as_ref(&self) -> &[u8]

Converts this type into a shared reference of the (usually inferred) input type.

impl<const N: usize> Clone for FixedBytes<N>

fn clone(&self) -> FixedBytes<N>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const N: usize> Debug for FixedBytes<N>

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

Formats the value using the given formatter.

impl<const N: usize> Default for FixedBytes<N>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, const N: usize> Deserialize<'de> for FixedBytes<N>

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

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<const N: usize> Display for FixedBytes<N>

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

Formats the value using the given formatter.

impl<const N: usize> From<[u8; N]> for FixedBytes<N>

fn from(bytes: [u8; N]) -> Self

Converts to this type from the input type.

impl<const N: usize> From<FixedBytes<N>> for [u8; N]

fn from(fixed: FixedBytes<N>) -> Self

Converts to this type from the input type.

impl<const N: usize> Hash for FixedBytes<N>

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<const N: usize> PartialEq for FixedBytes<N>

fn eq(&self, other: &FixedBytes<N>) -> 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<const N: usize> Serialize for FixedBytes<N>

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<const N: usize> Copy for FixedBytes<N>

impl<const N: usize> Eq for FixedBytes<N>

impl<const N: usize> StructuralPartialEq for FixedBytes<N>