Trait TopicEncoder

pub trait TopicEncoder: Sealed + Sized {
    const REQUIRES_BUFFER: bool;

    // Required methods
    fn encode_topic<T>(value: &T) -> [u8; 32]
       where T: AbiEncodeWith<Self>;
    fn encode_topic_with_hash_buffer<T>(
        value: &T,
        output: &mut [u8; 32],
        buffer: &mut [u8],
    )
       where T: AbiEncodeWith<Self>;
}

Specifies the topic (i.e. indexed event parameter) encoding implementation for the given ABI.

Required Associated Constants

const REQUIRES_BUFFER: bool

True if the topic hashing implementation requires a buffer.

(e.g. when hashing requires calling a pre-compile).

Required Methods

fn encode_topic<T>(value: &T) -> [u8; 32]

where T: AbiEncodeWith<Self>,

Encodes the value as a topic (i.e. an indexed event parameter).

fn encode_topic_with_hash_buffer<T>( value: &T, output: &mut [u8; 32], buffer: &mut [u8], )

where T: AbiEncodeWith<Self>,

Encodes the value as a topic (i.e. an indexed event parameter), utilizing the given buffer for hashing (if necessary).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl TopicEncoder for Ink

const REQUIRES_BUFFER: bool = false

fn encode_topic<T>(value: &T) -> [u8; 32]

where T: AbiEncodeWith<Self>,

fn encode_topic_with_hash_buffer<T>( _value: &T, _output: &mut [u8; 32], _buffer: &mut [u8], )

where T: AbiEncodeWith<Self>,

impl TopicEncoder for Sol

const REQUIRES_BUFFER: bool = false

fn encode_topic<T>(value: &T) -> [u8; 32]

where T: AbiEncodeWith<Self>,

fn encode_topic_with_hash_buffer<T>( _value: &T, _output: &mut [u8; 32], _buffer: &mut [u8], )

where T: AbiEncodeWith<Self>,

Implementors