Type Alias DbHash

pub type DbHash = H256;

Hash type that this backend uses for the database.

Aliased Type

struct DbHash(pub [u8; 32]);

Fields

0: [u8; 32]

Implementations

impl H256

pub const fn repeat_byte(byte: u8) -> H256

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

pub const fn zero() -> H256

Returns a new zero-initialized fixed hash.

pub const 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 const 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 const 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]) -> H256

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: &H256) -> 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) -> H256

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) -> H256

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) -> H256

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>(&mut self, rng: &mut R)

where R: Rng + ?Sized,

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>(rng: &mut R) -> H256

where R: Rng + ?Sized,

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

pub fn random() -> H256

Create a new hash with cryptographically random content.

Trait Implementations

impl AsMut<[u8]> for H256

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

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

impl AsRef<[u8]> for H256

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

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

impl BitAnd for H256

type Output = H256

The resulting type after applying the & operator.

fn bitand(self, rhs: H256) -> <H256 as BitAnd>::Output

Performs the & operation.

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

fn bitand_assign(&mut self, rhs: &'r H256)

Performs the &= operation.

impl BitAndAssign for H256

fn bitand_assign(&mut self, rhs: H256)

Performs the &= operation.

impl BitOr for H256

type Output = H256

The resulting type after applying the | operator.

fn bitor(self, rhs: H256) -> <H256 as BitOr>::Output

Performs the | operation.

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

fn bitor_assign(&mut self, rhs: &'r H256)

Performs the |= operation.

impl BitOrAssign for H256

fn bitor_assign(&mut self, rhs: H256)

Performs the |= operation.

impl BitXor for H256

type Output = H256

The resulting type after applying the ^ operator.

fn bitxor(self, rhs: H256) -> <H256 as BitXor>::Output

Performs the ^ operation.

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

fn bitxor_assign(&mut self, rhs: &'r H256)

Performs the ^= operation.

impl BitXorAssign for H256

fn bitxor_assign(&mut self, rhs: H256)

Performs the ^= operation.

impl CheckEqual for H256

fn check_equal(&self, other: &H256)

Perform the equality check.

impl Clone for H256

fn clone(&self) -> H256

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for H256

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

Formats the value using the given formatter.

impl Decodable for H256

fn decode(rlp: &Rlp<'_>) -> Result<H256, DecoderError>

Decode a value from RLP bytes

impl Decode for H256

fn decode<I>(input: &mut I) -> Result<H256, Error>

where I: Input,

Attempt to deserialise the value from input.

fn decode_into<I>( input: &mut I, dst: &mut MaybeUninit<Self>, ) -> Result<DecodeFinished, Error>

where I: Input,

Attempt to deserialize the value from input into a pre-allocated piece of memory.

fn skip<I>(input: &mut I) -> Result<(), Error>

where I: Input,

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Default for H256

fn default() -> H256

Returns the “default value” for a type.

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

fn deserialize<D>( deserializer: D, ) -> Result<H256, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for H256

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

Formats the value using the given formatter.

impl Encodable for H256

fn rlp_append(&self, s: &mut RlpStream)

Append a value to the stream

fn rlp_bytes(&self) -> BytesMut

Get rlp-encoded bytes for this instance

impl Encode for H256

fn using_encoded<R, F>(&self, f: F) -> R

where F: FnOnce(&[u8]) -> R,

Convert self to a slice and then invoke the given closure with it.

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode_to<T>(&self, dest: &mut T)

where T: Output + ?Sized,

Convert self to a slice and append it to the destination.

fn encode(&self) -> Vec<u8>

Convert self to an owned vector.

fn encoded_size(&self) -> usize

Calculates the encoded size.

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

fn from(bytes: &'a [u8; 32]) -> H256

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]) -> H256

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<[u8; 32]> for H256

fn from(bytes: [u8; 32]) -> H256

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

Note

The given bytes are interpreted in big endian order.

impl<T> From<CryptoBytes<32, T>> for H256

fn from(x: CryptoBytes<32, T>) -> H256

Converts to this type from the input type.

impl From<H160> for H256

fn from(value: H160) -> H256

Converts to this type from the input type.

impl FromStr for H256

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

type Err = FromHexError

The associated error which can be returned from parsing.

impl Hash for H256

fn hash<H>(&self, state: &mut H)

where H: Hasher,

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<I> Index<I> for H256

where I: SliceIndex<[u8]>,

type Output = <I as SliceIndex<[u8]>>::Output

The returned type after indexing.

fn index(&self, index: I) -> &<I as SliceIndex<[u8]>>::Output

Performs the indexing (container[index]) operation.

impl<I> IndexMut<I> for H256

where I: SliceIndex<[u8], Output = [u8]>,

fn index_mut(&mut self, index: I) -> &mut <I as SliceIndex<[u8]>>::Output

Performs the mutable indexing (container[index]) operation.

impl LowerHex for H256

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

Formats the value using the given formatter.

impl MaxEncodedLen for H256

fn max_encoded_len() -> usize

Upper bound, in bytes, of the maximum encoded size of this item.

impl Ord for H256

fn cmp(&self, other: &H256) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for H256

fn eq(&self, other: &H256) -> 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 PartialOrd for H256

fn partial_cmp(&self, other: &H256) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for H256

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl TypeInfo for H256

type Identity = H256

The type identifying for which type info is provided.

fn type_info() -> Type

Returns the static type identifier for Self.

impl UpperHex for H256

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

Formats the value using the given formatter.

impl Copy for H256

impl DecodeWithMemTracking for H256

impl EncodeLike for H256

impl Eq for H256