[]Struct primitive_types::H256

#[repr(C)]
pub struct H256(pub [u8; 32]);

Fixed-size uninterpreted hash type with 32 bytes (256 bits) size.

Methods

impl H256

pub fn repeat_byte(byte: u8) -> H256

Returns a new fixed hash where all bits are set to the given byte.

pub fn zero() -> H256

Returns a new zero-initialized fixed hash.

pub fn len_bytes() -> usize

Returns the size of this hash in bytes.

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

Extracts a byte slice containing the entire fixed hash.

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

Extracts a mutable byte slice containing the entire fixed hash.

pub fn as_fixed_bytes(&self) -> &[u8; 32]

Extracts a reference to the byte array containing the entire fixed hash.

pub fn as_fixed_bytes_mut(&mut self) -> &mut [u8; 32]

Extracts a reference to the byte array containing the entire fixed hash.

pub fn to_fixed_bytes(self) -> [u8; 32]

Returns the inner bytes array.

pub fn as_ptr(&self) -> *const u8

Returns a constant raw pointer to the value.

pub fn as_mut_ptr(&mut self) -> *mut u8

Returns a mutable raw pointer to the value.

pub fn assign_from_slice(&mut self, src: &[u8])

Assign the bytes from the byte slice src to self.

Note

The given bytes are interpreted in big endian order.

Panics

If the length of src and the number of bytes in self do not match.

pub fn from_slice(src: &[u8]) -> Self

Create a new fixed-hash from the given slice src.

Note

The given bytes are interpreted in big endian order.

Panics

If the length of src and the number of bytes in Self do not match.

pub fn covers(&self, b: &Self) -> bool

Returns true if all bits set in b are also set in self.

pub fn is_zero(&self) -> bool

Returns true if no bits are set.

impl H256

Utilities using the byteorder crate.

pub fn to_low_u64_be(&self) -> u64

Returns the lowest 8 bytes interpreted as big-endian.

Note

For hash type with less than 8 bytes the missing bytes are interpreted as being zero.

pub fn to_low_u64_le(&self) -> u64

Returns the lowest 8 bytes interpreted as little-endian.

Note

For hash type with less than 8 bytes the missing bytes are interpreted as being zero.

pub fn to_low_u64_ne(&self) -> u64

Returns the lowest 8 bytes interpreted as native-endian.

Note

For hash type with less than 8 bytes the missing bytes are interpreted as being zero.

pub fn from_low_u64_be(val: u64) -> Self

Creates a new hash type from the given u64 value.

Note

  • The given u64 value is interpreted as big endian.
  • Ignores the most significant bits of the given value if the hash type has less than 8 bytes.

pub fn from_low_u64_le(val: u64) -> Self

Creates a new hash type from the given u64 value.

Note

  • The given u64 value is interpreted as little endian.
  • Ignores the most significant bits of the given value if the hash type has less than 8 bytes.

pub fn from_low_u64_ne(val: u64) -> Self

Creates a new hash type from the given u64 value.

Note

  • The given u64 value is interpreted as native endian.
  • Ignores the most significant bits of the given value if the hash type has less than 8 bytes.

impl H256

Utilities using the rand crate.

pub fn randomize_using<R: ?Sized>(&mut self, rng: &mut R) where
    R: Rng

Assign self to a cryptographically random value using the given random number generator.

pub fn randomize(&mut self)

Assign self to a cryptographically random value.

pub fn random_using<R: ?Sized>(rng: &mut R) -> Self where
    R: Rng

Create a new hash with cryptographically random content using the given random number generator.

pub fn random() -> Self

Create a new hash with cryptographically random content.

Trait Implementations

impl AsMut<[u8]> for H256

impl Eq for H256

impl AsRef<[u8]> for H256

impl Default for H256

impl Clone for H256

impl PartialOrd<H256> for H256

impl Ord for H256

impl PartialEq<H256> for H256

impl From<[u8; 32]> for H256

fn from(bytes: [u8; 32]) -> Self

Constructs a hash type from the given bytes array of fixed length.

Note

The given bytes are interpreted in big endian order.

impl<'a> From<&'a [u8; 32]> for H256

fn from(bytes: &'a [u8; 32]) -> Self

Constructs a hash type from the given reference to the bytes array of fixed length.

Note

The given bytes are interpreted in big endian order.

impl<'a> From<&'a mut [u8; 32]> for H256

fn from(bytes: &'a mut [u8; 32]) -> Self

Constructs a hash type from the given reference to the mutable bytes array of fixed length.

Note

The given bytes are interpreted in big endian order.

impl From<H256> for [u8; 32]

impl From<H160> for H256

impl From<H256> for H160

impl Copy for H256

impl Hash for H256

impl<'l, 'r> BitAnd<&'r H256> for &'l H256

type Output = H256

The resulting type after applying the & operator.

impl BitAnd<H256> for H256

type Output = H256

The resulting type after applying the & operator.

impl<'l, 'r> BitOr<&'r H256> for &'l H256

type Output = H256

The resulting type after applying the | operator.

impl BitOr<H256> for H256

type Output = H256

The resulting type after applying the | operator.

impl<'l, 'r> BitXor<&'r H256> for &'l H256

type Output = H256

The resulting type after applying the ^ operator.

impl BitXor<H256> for H256

type Output = H256

The resulting type after applying the ^ operator.

impl<'r> BitAndAssign<&'r H256> for H256

impl BitAndAssign<H256> for H256

impl<'r> BitOrAssign<&'r H256> for H256

impl BitOrAssign<H256> for H256

impl<'r> BitXorAssign<&'r H256> for H256

impl BitXorAssign<H256> for H256

impl<I> Index<I> for H256 where
    I: SliceIndex<[u8]>, 

type Output = I::Output

The returned type after indexing.

impl<I> IndexMut<I> for H256 where
    I: SliceIndex<[u8], Output = [u8]>, 

impl Display for H256

impl Debug for H256

impl FromStr for H256

type Err = FromHexError

The associated error which can be returned from parsing.

fn from_str(input: &str) -> Result<H256, FromHexError>

Creates a hash type instance from the given string.

Note

The given input string is interpreted in big endian.

Errors

  • When encountering invalid non hex-digits
  • Upon empty string input or invalid input length in general

impl LowerHex for H256

impl UpperHex for H256

impl Distribution<H256> for Standard

impl Serialize for H256

impl<'de> Deserialize<'de> for H256

impl Encode for H256

impl Decode for H256

impl EncodeLike<H256> for H256

Auto Trait Implementations

impl Send for H256

impl Unpin for H256

impl Sync for H256

impl UnwindSafe for H256

impl RefUnwindSafe for H256

Blanket Implementations

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Rand for T where
    Standard: Distribution<T>, 
[src]

impl<T> DeserializeOwned for T where
    T: Deserialize<'de>, 
[src]

impl<T, X> Encode for X where
    T: Encode + ?Sized,
    X: WrapperTypeEncode<Target = T>, 
[src]

impl<T, X> Decode for X where
    T: Decode + Into<X>,
    X: WrapperTypeDecode<Wrapped = T>, 
[src]

impl<S> Codec for S where
    S: Encode + Decode
[src]

impl<S> FullEncode for S where
    S: Encode + EncodeLike<S>, 
[src]

impl<S> FullCodec for S where
    S: Decode + FullEncode
[src]

impl<'_, '_, T> EncodeLike<&'_ &'_ T> for T where
    T: Encode
[src]

impl<'a, T> EncodeLike<Cow<'a, T>> for T where
    T: Encode + ToOwned
[src]

impl<T> EncodeLike<Box<T>> for T where
    T: Encode
[src]

impl<T> EncodeLike<Arc<T>> for T where
    T: Encode
[src]

impl<'_, T> EncodeLike<&'_ T> for T where
    T: Encode
[src]

impl<'_, T> EncodeLike<&'_ mut T> for T where
    T: Encode
[src]

impl<T> EncodeLike<Rc<T>> for T where
    T: Encode
[src]

impl<T> KeyedVec for T where
    T: Codec
[src]

impl<T> DecodeAll for T where
    T: Decode
[src]