Struct primitive_types::H256

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

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

Tuple Fields§

§0: [u8; 32]

Implementations§

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impl H256

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

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

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pub const fn zero() -> H256

Returns a new zero-initialized fixed hash.

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pub const fn len_bytes() -> usize

Returns the size of this hash in bytes.

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

Extracts a byte slice containing the entire fixed hash.

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

Extracts a mutable byte slice containing the entire fixed hash.

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

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

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

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

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

Returns the inner bytes array.

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

Returns a constant raw pointer to the value.

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

Returns a mutable raw pointer to the value.

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

Assign the bytes from the byte slice src to self.

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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.

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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.

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

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

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pub fn is_zero(&self) -> bool

Returns true if no bits are set.

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impl H256

Utilities using the byteorder crate.

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pub fn to_low_u64_be(&self) -> u64

Returns the lowest 8 bytes interpreted as big-endian.

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

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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.

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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.

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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.
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pub fn from_low_u64_le(val: u64) -> Self

Creates a new hash type from the given u64 value.

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  • 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.
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pub fn from_low_u64_ne(val: u64) -> Self

Creates a new hash type from the given u64 value.

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  • 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.
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impl H256

Utilities using the rand crate.

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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.

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pub fn randomize(&mut self)

Assign self to a cryptographically random value.

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pub fn random_using<R>(rng: &mut R) -> Selfwhere R: Rng + ?Sized,

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

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pub fn random() -> Self

Create a new hash with cryptographically random content.

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impl AsMut<[u8]> for H256

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

Converts this type into a mutable reference of the (usually inferred) input type.
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impl AsRef<[u8]> for H256

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

Converts this type into a shared reference of the (usually inferred) input type.
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impl<'l, 'r> BitAnd<&'r H256> for &'l H256

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type Output = H256

The resulting type after applying the & operator.
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fn bitand(self, rhs: &'r H256) -> Self::Output

Performs the & operation. Read more
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impl BitAnd<H256> for H256

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type Output = H256

The resulting type after applying the & operator.
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fn bitand(self, rhs: Self) -> Self::Output

Performs the & operation. Read more
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impl<'r> BitAndAssign<&'r H256> for H256

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

Performs the &= operation. Read more
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impl BitAndAssign<H256> for H256

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fn bitand_assign(&mut self, rhs: H256)

Performs the &= operation. Read more
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impl<'l, 'r> BitOr<&'r H256> for &'l H256

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type Output = H256

The resulting type after applying the | operator.
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fn bitor(self, rhs: &'r H256) -> Self::Output

Performs the | operation. Read more
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impl BitOr<H256> for H256

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type Output = H256

The resulting type after applying the | operator.
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fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation. Read more
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impl<'r> BitOrAssign<&'r H256> for H256

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

Performs the |= operation. Read more
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impl BitOrAssign<H256> for H256

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fn bitor_assign(&mut self, rhs: H256)

Performs the |= operation. Read more
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impl<'l, 'r> BitXor<&'r H256> for &'l H256

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type Output = H256

The resulting type after applying the ^ operator.
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fn bitxor(self, rhs: &'r H256) -> Self::Output

Performs the ^ operation. Read more
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impl BitXor<H256> for H256

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type Output = H256

The resulting type after applying the ^ operator.
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fn bitxor(self, rhs: Self) -> Self::Output

Performs the ^ operation. Read more
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impl<'r> BitXorAssign<&'r H256> for H256

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

Performs the ^= operation. Read more
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impl BitXorAssign<H256> for H256

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fn bitxor_assign(&mut self, rhs: H256)

Performs the ^= operation. Read more
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impl Clone for H256

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fn clone(&self) -> H256

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for H256

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

Formats the value using the given formatter. Read more
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impl Decode for H256

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

Attempt to deserialise the value from input.
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fn skip<I>(input: &mut I) -> Result<(), Error>where I: Input,

Attempt to skip the encoded value from input. Read more
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fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type. Read more
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impl Default for H256

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for H256

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

Deserialize this value from the given Serde deserializer. Read more
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impl Display for H256

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

Formats the value using the given formatter. Read more
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impl Distribution<H256> for Standard

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fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> H256

Generate a random value of T, using rng as the source of randomness.
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fn sample_iter<R>(self, rng: R) -> DistIter<Self, R, T>where R: Rng, Self: Sized,

Create an iterator that generates random values of T, using rng as the source of randomness. Read more
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fn map<F, S>(self, func: F) -> DistMap<Self, F, T, S>where F: Fn(T) -> S, Self: Sized,

Create a distribution of values of ‘S’ by mapping the output of Self through the closure F Read more
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impl Encode for H256

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fn using_encoded<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R

Convert self to a slice and then invoke the given closure with it.
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fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding. Read more
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fn encode_to<T>(&self, dest: &mut T)where T: Output + ?Sized,

Convert self to a slice and append it to the destination.
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fn encode(&self) -> Vec<u8, Global>

Convert self to an owned vector.
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fn encoded_size(&self) -> usize

Calculates the encoded size. Read more
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impl<'a> From<&'a [u8; 32]> for H256

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

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

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The given bytes are interpreted in big endian order.

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

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

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

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The given bytes are interpreted in big endian order.

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impl From<[u8; 32]> for H256

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

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

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The given bytes are interpreted in big endian order.

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impl From<H160> for H256

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fn from(value: H160) -> H256

Converts to this type from the input type.
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impl From<H256> for [u8; 32]

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fn from(s: H256) -> Self

Converts to this type from the input type.
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impl From<H256> for H160

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fn from(value: H256) -> H160

Converts to this type from the input type.
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impl FromStr for H256

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

Creates a hash type instance from the given string.

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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
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type Err = FromHexError

The associated error which can be returned from parsing.
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impl Hash for H256

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<I> Index<I> for H256where I: SliceIndex<[u8]>,

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

The returned type after indexing.
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fn index(&self, index: I) -> &I::Output

Performs the indexing (container[index]) operation. Read more
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impl<I> IndexMut<I> for H256where I: SliceIndex<[u8], Output = [u8]>,

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fn index_mut(&mut self, index: I) -> &mut I::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl LowerHex for H256

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

Formats the value using the given formatter.
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impl MaxEncodedLen for H256

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fn max_encoded_len() -> usize

Upper bound, in bytes, of the maximum encoded size of this item.
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impl Ord for H256

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl PartialEq<H256> for H256

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd<H256> for H256

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for H256

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

Serialize this value into the given Serde serializer. Read more
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impl TypeInfo for H256

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type Identity = H256

The type identifying for which type info is provided. Read more
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fn type_info() -> Type

Returns the static type identifier for Self.
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impl UpperHex for H256

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

Formats the value using the given formatter.
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impl Copy for H256

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impl EncodeLike<H256> for H256

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impl Eq for H256

Auto Trait Implementations§

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impl RefUnwindSafe for H256

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impl Send for H256

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impl Sync for H256

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impl Unpin for H256

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impl UnwindSafe for H256

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<A, T> AsBits<T> for Awhere A: AsRef<[T]>, T: BitStore,

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fn as_bits<O>(&self) -> &BitSlice<T, O> where O: BitOrder,

Views self as an immutable bit-slice region with the O ordering.
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fn try_as_bits<O>(&self) -> Result<&BitSlice<T, O>, BitSpanError<T>>where O: BitOrder,

Attempts to view self as an immutable bit-slice region with the O ordering. Read more
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impl<T, U> AsByteSlice<T> for Uwhere T: ToByteSlice, U: AsRef<[T]> + ?Sized,

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

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impl<A, T> AsMutBits<T> for Awhere A: AsMut<[T]>, T: BitStore,

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fn as_mut_bits<O>(&mut self) -> &mut BitSlice<T, O> where O: BitOrder,

Views self as a mutable bit-slice region with the O ordering.
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fn try_as_mut_bits<O>(&mut self) -> Result<&mut BitSlice<T, O>, BitSpanError<T>>where O: BitOrder,

Attempts to view self as a mutable bit-slice region with the O ordering. Read more
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impl<T, U> AsMutByteSlice<T> for Uwhere T: ToMutByteSlice, U: AsMut<[T]> + ?Sized,

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

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impl<U> AsMutSliceOf for Uwhere U: AsMut<[u8]> + ?Sized,

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fn as_mut_slice_of<T>(&mut self) -> Result<&mut [T], Error>where T: FromByteSlice,

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impl<U> AsSliceOf for Uwhere U: AsRef<[u8]> + ?Sized,

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fn as_slice_of<T>(&self) -> Result<&[T], Error>where T: FromByteSlice,

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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Conv for T

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fn conv<T>(self) -> Twhere Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> DecodeAll for Twhere T: Decode,

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fn decode_all(input: &mut &[u8]) -> Result<T, Error>

Decode Self and consume all of the given input data. Read more
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impl<T> DecodeLimit for Twhere T: Decode,

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fn decode_all_with_depth_limit( limit: u32, input: &mut &[u8] ) -> Result<T, Error>

Decode Self and consume all of the given input data. Read more
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fn decode_with_depth_limit<I>(limit: u32, input: &mut I) -> Result<T, Error>where I: Input,

Decode Self with the given maximum recursion depth and advance input by the number of bytes consumed. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> KeyedVec for Twhere T: Codec,

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fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8, Global>

Return an encoding of Self prepended by given slice.
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impl<T> Pipe for Twhere T: ?Sized,

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> Rwhere R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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fn pipe_ref_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> Rwhere R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> Rwhere Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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fn pipe_borrow_mut<'a, B, R>( &'a mut self, func: impl FnOnce(&'a mut B) -> R ) -> Rwhere Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> Rwhere Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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fn pipe_as_mut<'a, U, R>(&'a mut self, func: impl FnOnce(&'a mut U) -> R) -> Rwhere Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> Rwhere Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R ) -> Rwhere Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToHex for Twhere T: AsRef<[u8]>,

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fn encode_hex<U>(&self) -> Uwhere U: FromIterator<char>,

Encode the hex strict representing self into the result. Lower case letters are used (e.g. f9b4ca)
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fn encode_hex_upper<U>(&self) -> Uwhere U: FromIterator<char>,

Encode the hex strict representing self into the result. Upper case letters are used (e.g. F9B4CA)
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<S> Codec for Swhere S: Decode + Encode,

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impl<T> DeserializeOwned for Twhere T: for<'de> Deserialize<'de>,

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impl<T> EncodeLike<&&T> for Twhere T: Encode,

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impl<T> EncodeLike<&T> for Twhere T: Encode,

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impl<T> EncodeLike<&mut T> for Twhere T: Encode,

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impl<T> EncodeLike<Arc<T>> for Twhere T: Encode,

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impl<T> EncodeLike<Box<T, Global>> for Twhere T: Encode,

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impl<'a, T> EncodeLike<Cow<'a, T>> for Twhere T: ToOwned + Encode,

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impl<T> EncodeLike<Rc<T>> for Twhere T: Encode,

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impl<S> FullCodec for Swhere S: Decode + FullEncode,

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impl<S> FullEncode for Swhere S: Encode + EncodeLike<S>,

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impl<T> StaticTypeInfo for Twhere T: TypeInfo + 'static,