Struct elrond_wasm::types::H256

pub struct H256(_);

Type that holds 32 bytes of data. Data is kept on the heap to keep wasm size low and avoid copies.

Implementations

impl H256

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

impl H256

pub fn zero() -> Self

Returns a new zero-initialized fixed hash. Allocates directly in heap. Minimal resulting wasm code (14 bytes if not inlined).

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_array(&self) -> &[u8; 32]

pub fn copy_to_array(&self, target: &mut [u8; 32])

pub fn to_vec(&self) -> Vec<u8>

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

Pointer to the data on the heap.

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

Returns an unsafe mutable pointer to the data on the heap. Used by the API to populate data.

pub fn is_zero(&self) -> bool

True if all 32 bytes of the hash are zero.

pub fn into_boxed_bytes(self) -> BoxedBytes

Transmutes self to an (in principle) variable length boxed bytes object. Both BoxedBytes and H256 keep the data on the heap, so only the pointer to that data needs to be transmuted. Does not reallocate or copy data, the data on the heap remains untouched.

impl H256

pub fn decode_from_boxed_bytes_or_exit<ExitCtx: Clone>(
    input: Box<[u8]>,
    c: ExitCtx,
    exit: fn(_: ExitCtx, _: DecodeError) -> !
) -> Self

Trait Implementations

impl AsMut<[u8]> for H256

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

Performs the conversion.

impl AsRef<[u8]> for H256

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

Performs the conversion.

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

Formats the value using the given formatter.

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 Address> for &'a H256

fn from(address: &'a Address) -> Self

Performs the conversion.

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<[u8; 32]> for H256

fn from(arr: [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 From<Address> for H256

fn from(address: Address) -> Self

Performs the conversion.

impl From<Box<[u8; 32], Global>> for H256

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

Performs the conversion.

impl From<H256> for [u8; 32]

fn from(s: H256) -> Self

Performs the conversion.

impl From<H256> for Address

fn from(hash: H256) -> Self

Performs the conversion.

impl Hash for H256

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, 

Feeds a slice of this type into the given Hasher.

impl NestedDecode for H256

fn dep_decode<I: NestedDecodeInput>(input: &mut I) -> Result<Self, DecodeError>

Attempt to deserialise the value from input, using the format of an object nested inside another structure. In case of success returns the deserialized value and the number of bytes consumed during the operation.

fn dep_decode_or_exit<I: NestedDecodeInput, ExitCtx: Clone>(
    input: &mut I,
    c: ExitCtx,
    exit: fn(_: ExitCtx, _: DecodeError) -> !
) -> Self

Version of top_decode that exits quickly in case of error. Its purpose is to create smaller implementations in cases where the application is supposed to exit directly on decode error.

impl NestedEncode for H256

fn dep_encode<O: NestedEncodeOutput>(
    &self,
    dest: &mut O
) -> Result<(), EncodeError>

NestedEncode to output, using the format of an object nested inside another structure. Does not provide compact version.

fn dep_encode_or_exit<O: NestedEncodeOutput, ExitCtx: Clone>(
    &self,
    dest: &mut O,
    _: ExitCtx,
    _: fn(_: ExitCtx, _: EncodeError) -> !
)

Version of top_decode that exits quickly in case of error. Its purpose is to create smaller implementations in cases where the application is supposed to exit directly on decode error.

impl PartialEq<H256> for H256

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &H256) -> bool

This method tests for !=.

impl TopDecode for H256

fn top_decode<I: TopDecodeInput>(input: I) -> Result<Self, DecodeError>

Attempt to deserialize the value from input.

fn top_decode_or_exit<I: TopDecodeInput, ExitCtx: Clone>(
    input: I,
    c: ExitCtx,
    exit: fn(_: ExitCtx, _: DecodeError) -> !
) -> Self

Version of top_decode that exits quickly in case of error. Its purpose is to create smaller implementations in cases where the application is supposed to exit directly on decode error.

impl TopEncode for H256

fn top_encode<O: TopEncodeOutput>(&self, output: O) -> Result<(), EncodeError>

Attempt to serialize the value to ouput.

fn top_encode_or_exit<O: TopEncodeOutput, ExitCtx: Clone>(
    &self,
    output: O,
    _: ExitCtx,
    _: fn(_: ExitCtx, _: EncodeError) -> !
)

Version of top_decode that exits quickly in case of error. Its purpose is to create smaller bytecode implementations in cases where the application is supposed to exit directly on decode error.

impl TypeAbi for H256

fn type_name() -> String

fn provide_type_descriptions<TDC: TypeDescriptionContainer>(
    accumulator: &mut TDC
)

A type can provide more than its own description. For instance, a struct can also provide the descriptions of the type of its fields. TypeAbi doesn’t care for the exact accumulator type, which is abstracted by the TypeDescriptionContainer trait.

impl Eq for H256

impl StructuralEq for H256

impl StructuralPartialEq for H256