Struct exonum_configuration::MaybeVote

pub struct MaybeVote(_);

A functional equivalent to Option<Vote> used to store votes in the service schema.

Notes

The None variant of the type is represented by a Vote with all bytes set to zero.

Methods

impl MaybeVote

pub fn none() -> Self

Creates a None variant.

pub fn some(vote: Vote) -> Self

Creates a Some variant.

Methods from Deref<Target = Option<Vote>>

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 num_as_str: Option<String> = Some("10".to_string());
// First, cast `Option<String>` to `Option<&String>` with `as_ref`,
// then consume *that* with `map`, leaving `num_as_str` on the stack.
let num_as_int: Option<usize> = num_as_str.as_ref().map(|n| n.len());
println!("still can print num_as_str: {:?}", num_as_str);

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);

Trait Implementations

impl Clone for MaybeVote

fn clone(&self) -> MaybeVote

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MaybeVote

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

Formats the value using the given formatter.

impl PartialEq for MaybeVote

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

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

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

This method tests for !=.

impl From<MaybeVote> for Option<Vote>

fn from(value: MaybeVote) -> Option<Vote>

Performs the conversion.

impl Deref for MaybeVote

type Target = Option<Vote>

The resulting type after dereferencing.

fn deref(&self) -> &Option<Vote>

Dereferences the value.

impl CryptoHash for MaybeVote

fn hash(&self) -> Hash

Returns a hash of the value.

impl StorageValue for MaybeVote

Important traits for Vec<u8>

impl Write for Vec<u8>

fn into_bytes(self) -> Vec<u8>

Serialize a value into a vector of bytes.

fn from_bytes(bytes: Cow<[u8]>) -> Self

Deserialize a value from bytes.