Struct TopicFilter

pub struct TopicFilter(/* private fields */);

When a Contract creates a log, it can include up to 4 pieces of data to be indexed by. The indexed data is hashed and included in a Bloom Filter, which is a data structure that allows for efficient filtering.

So, a filter may correspondingly have up to 4 topic-sets, where each topic-set refers to a condition that must match the indexed log topic in that position (i.e. each condition is AND-ed together).

If a topic-set is null, a log topic in that position is not filtered at all and any value matches.

If a topic-set is a single topic, a log topic in that position must match that topic.

If a topic-set is an array of topics, a log topic in that position must match any one of the topics (i.e. the topic in this position are OR-ed).

Trait Implementations

impl Clone for TopicFilter

fn clone(&self) -> TopicFilter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TopicFilter

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

Formats the value using the given formatter.

impl Default for TopicFilter

fn default() -> TopicFilter

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TopicFilter

fn deserialize<__D>( __deserializer: __D, ) -> Result<TopicFilter, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for TopicFilter

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 PartialEq for TopicFilter

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

Tests for self and other values to be equal, and is used by ==.

const 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 TopicFilter

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 Eq for TopicFilter

impl StructuralPartialEq for TopicFilter