Enum Topic 

pub enum Topic<T> {
    None,
    Any,
    OneOf(Vec<T>),
    This(T),
}

Acceptable topic possibilities.

Variants

None

Should skip serialize.

Any

Match any.

OneOf(Vec<T>)

Match any of the hashes.

This(T)

Match only this hash.

Implementations

impl<T> Topic<T>

pub fn map<F, O>(self, f: F) -> Topic<O>

where F: Fn(T) -> O,

Map

pub fn is_any(&self) -> bool

Returns true if topic is empty (Topic::Any)

pub fn need_serialize(&self) -> bool

Returns true if topic should be serialized

Trait Implementations

impl<T> Clone for Topic<T>

where T: Clone,

fn clone(&self) -> Topic<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Topic<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Topic<T>

fn default() -> Topic<T>

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Topic<H256>

fn deserialize<D>( deserializer: D, ) -> Result<Topic<H256>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> From<Option<T>> for Topic<T>

fn from(o: Option<T>) -> Topic<T>

Converts to this type from the input type.

impl<T> From<T> for Topic<T>

fn from(topic: T) -> Topic<T>

Converts to this type from the input type.

impl<T> From<Topic<T>> for Vec<T>

fn from(topic: Topic<T>) -> Vec<T>

Converts to this type from the input type.

impl<T> From<Vec<T>> for Topic<T>

fn from(topics: Vec<T>) -> Topic<T>

Converts to this type from the input type.

impl<T> Hash for Topic<T>

where T: Hash,

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

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<T> Index<usize> for Topic<T>

type Output = T

The returned type after indexing.

fn index(&self, index: usize) -> &<Topic<T> as Index<usize>>::Output

Performs the indexing (container[index]) operation.

impl<T> PartialEq for Topic<T>

where T: PartialEq,

fn eq(&self, other: &Topic<T>) -> 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 Serialize for Topic<H256>

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> Eq for Topic<T>

where T: Eq,

impl<T> StructuralPartialEq for Topic<T>