Events
Syntax
Event :
event
IDENTIFIER:
NEWLINE
INDENT
EventField*
DEDENTEventField :
EventIndexability IDENTIFIER:
TypeEventIndexability :
idx
?
An event is a nominal event type defined with the keyword event
. It is emitted with the keyword emit
.
An example of a event
item and its use:
use std::context::Context
contract Foo:
event Transfer:
idx sender: address
idx receiver: address
value: u256
fn transfer(ctx: Context, to: address, value: u256):
# Heavy logic here
# All done, log the event for listeners
emit Transfer(ctx, sender: ctx.msg_sender(), receiver: to, value)