Function sp_finality_grandpa::localized_payload_with_buffer

pub fn localized_payload_with_buffer<E: Encode>(
    round: RoundNumber, 
    set_id: SetId, 
    message: &E, 
    buf: &mut Vec<u8>
)

Encode round message localized to a given round and set id using the given buffer. The given buffer will be cleared and the resulting encoded payload will always be written to the start of the buffer.