Struct Witness 

pub struct Witness { /* private fields */ }

Available on crate feature alloc only.

The Witness is the data used to unlock bitcoin since the segwit upgrade.

Can be logically seen as an array of bytestrings, i.e. Vec<Vec<u8>>, and it is serialized on the wire in that format. You can convert between this type and Vec<Vec<u8>> by using Witness::from_slice and Witness::to_vec.

For serialization and deserialization performance it is stored internally as a single Vec, saving some allocations.

Implementations

impl Witness

pub const fn new() -> Self

Constructs a new empty Witness.

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

Constructs a new Witness object from a slice of bytes slices where each slice is a witness item.

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

Convenience method to create an array of byte-arrays from this witness.

pub fn is_empty(&self) -> bool

Returns true if the witness contains no element.

pub fn iter(&self) -> Iter<'_>

Returns a struct implementing Iterator.

pub fn len(&self) -> usize

Returns the number of elements this witness holds.

pub fn size(&self) -> usize

Returns the number of bytes this witness contributes to a transactions total size.

pub fn clear(&mut self)

Clear the witness.

pub fn push<T: AsRef<[u8]>>(&mut self, new_element: T)

Push a new element on the witness, requires an allocation.

pub fn last(&self) -> Option<&[u8]>

Returns the last element in the witness, if any.

pub fn second_to_last(&self) -> Option<&[u8]>

Returns the second-to-last element in the witness, if any.

pub fn third_to_last(&self) -> Option<&[u8]>

Returns the third-to-last element in the witness, if any.

pub fn nth(&self, index: usize) -> Option<&[u8]>

Return the nth element in the witness, if any

Trait Implementations

impl<'a> Arbitrary<'a> for Witness

Available on crate feature arbitrary only.

fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for Witness

fn clone(&self) -> Witness

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Witness

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

Formats the value using the given formatter.

impl Default for Witness

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Witness

Available on crate feature serde only.

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

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<&[&[u8]]> for Witness

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

Converts to this type from the input type.

impl From<&[Vec<u8>]> for Witness

fn from(slice: &[Vec<u8>]) -> Self

Converts to this type from the input type.

impl From<Vec<&[u8]>> for Witness

fn from(vec: Vec<&[u8]>) -> Self

Converts to this type from the input type.

impl From<Vec<Vec<u8>>> for Witness

fn from(vec: Vec<Vec<u8>>) -> Self

Converts to this type from the input type.

impl Hash for Witness

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 Index<usize> for Witness

type Output = [u8]

The returned type after indexing.

fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<'a> IntoIterator for &'a Witness

type IntoIter = Iter<'a>

Which kind of iterator are we turning this into?

type Item = &'a [u8]

The type of the elements being iterated over.

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl Ord for Witness

fn cmp(&self, other: &Witness) -> 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 Witness

fn eq(&self, other: &Witness) -> 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 Witness

fn partial_cmp(&self, other: &Witness) -> 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 Witness

Available on crate feature serde only.

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Witness

impl StructuralPartialEq for Witness