Struct merkle_tree_stream::DefaultNode

pub struct DefaultNode {
    pub parent: usize,
    pub data: Option<Vec<u8>>,
    pub hash: Vec<u8>,
    pub length: usize,
    pub index: usize,
}

Node representation.

Fields

parent: usize

Reference to this node's parent node.

data: Option<Vec<u8>>

Data if it's a leaf node, nothing if it's a parent node.

hash: Vec<u8>

Hash of the data

length: usize

Total size of all its child nodes combined.

index: usize

Offset into the flat-tree data structure.

Methods

impl DefaultNode

pub fn from_partial(partial: &PartialNode, hash: Vec<u8>) -> Self

Convert a PartialNode to a Node.

Methods from Deref<Target = Option<Vec<u8>>>

pub fn is_some(&self) -> bool

Returns true if the option is a Some value.

Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_some(), true);

let x: Option<u32> = None;
assert_eq!(x.is_some(), false);

pub fn is_none(&self) -> bool

Returns true if the option is a None value.

Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_none(), false);

let x: Option<u32> = None;
assert_eq!(x.is_none(), true);

pub fn as_ref(&self) -> Option<&T>

Converts from Option<T> to Option<&T>.

Examples

Convert an Option<String> into an Option<usize>, preserving the original. The map method takes the self argument by value, consuming the original, so this technique uses as_ref to first take an Option to a reference to the value inside the original.

let text: Option<String> = Some("Hello, world!".to_string());
// First, cast `Option<String>` to `Option<&String>` with `as_ref`,
// then consume *that* with `map`, leaving `text` on the stack.
let text_length: Option<usize> = text.as_ref().map(|s| s.len());
println!("still can print text: {:?}", text);

pub fn as_mut(&mut self) -> Option<&mut T>

Converts from Option<T> to Option<&mut T>.

Examples

let mut x = Some(2);
match x.as_mut() {
    Some(v) => *v = 42,
    None => {},
}
assert_eq!(x, Some(42));

Important traits for Iter<'a, A>

impl<'a, A> Iterator for Iter<'a, A> type Item = &'a A;

pub fn iter(&self) -> Iter<T>

Returns an iterator over the possibly contained value.

Examples

let x = Some(4);
assert_eq!(x.iter().next(), Some(&4));

let x: Option<u32> = None;
assert_eq!(x.iter().next(), None);

Important traits for IterMut<'a, A>

impl<'a, A> Iterator for IterMut<'a, A> type Item = &'a mut A;

pub fn iter_mut(&mut self) -> IterMut<T>

Returns a mutable iterator over the possibly contained value.

Examples

let mut x = Some(4);
match x.iter_mut().next() {
    Some(v) => *v = 42,
    None => {},
}
assert_eq!(x, Some(42));

let mut x: Option<u32> = None;
assert_eq!(x.iter_mut().next(), None);

Important traits for &'a mut W

impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_or_insert(&mut self, v: T) -> &mut T

Inserts v into the option if it is None, then returns a mutable reference to the contained value.

Examples

let mut x = None;

{
    let y: &mut u32 = x.get_or_insert(5);
    assert_eq!(y, &5);

    *y = 7;
}

assert_eq!(x, Some(7));

Important traits for &'a mut W

impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_or_insert_with<F>(&mut self, f: F) -> &mut T where
    F: FnOnce() -> T, 

Inserts a value computed from f into the option if it is None, then returns a mutable reference to the contained value.

Examples

let mut x = None;

{
    let y: &mut u32 = x.get_or_insert_with(|| 5);
    assert_eq!(y, &5);

    *y = 7;
}

assert_eq!(x, Some(7));

pub fn take(&mut self) -> Option<T>

Takes the value out of the option, leaving a None in its place.

Examples

let mut x = Some(2);
x.take();
assert_eq!(x, None);

let mut x: Option<u32> = None;
x.take();
assert_eq!(x, None);

Trait Implementations

impl Debug for DefaultNode

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for DefaultNode

impl Ord for DefaultNode

fn cmp(&self, __arg_0: &DefaultNode) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

impl PartialEq for DefaultNode

fn eq(&self, __arg_0: &DefaultNode) -> bool

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

fn ne(&self, __arg_0: &DefaultNode) -> bool

This method tests for !=.

impl PartialOrd for DefaultNode

fn partial_cmp(&self, __arg_0: &DefaultNode) -> Option<Ordering>

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

fn lt(&self, __arg_0: &DefaultNode) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, __arg_0: &DefaultNode) -> bool

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

fn gt(&self, __arg_0: &DefaultNode) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, __arg_0: &DefaultNode) -> bool

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

impl Clone for DefaultNode

fn clone(&self) -> DefaultNode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Node for DefaultNode

Important traits for &'a mut [u8]

impl<'a> Write for &'a mut [u8]impl<'a> Read for &'a [u8]

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

Get the hash contained in the node.

fn len(&self) -> usize

Get the length of the node.

fn is_empty(&self) -> bool

Check if the length is zero.

fn index(&self) -> usize

Get the position at which the node was found.

fn parent(&self) -> usize

Get the position of the parent of the node.

impl Deref for DefaultNode

type Target = Option<Vec<u8>>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl DerefMut for DefaultNode

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.