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discard """
output: "pie"
"""
import tables, lists
type
EventArgs = object of RootObj
EventEmitter = object of RootObj
events*: Table[string, DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]]
proc emit*(emitter: EventEmitter, event: string, args: EventArgs) =
for fn in nodes(emitter.events[event]):
fn.value(args) #call function with args.
proc on*(emitter: var EventEmitter, event: string,
fn: proc(e: EventArgs) {.nimcall.}) =
if not hasKey(emitter.events, event):
var list: DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]
add(emitter.events, event, list) #if not, add it.
append(emitter.events[event], fn)
proc initEmitter(emitter: var EventEmitter) =
emitter.events = initTable[string,
DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]]()
var
ee: EventEmitter
args: EventArgs
initEmitter(ee)
ee.on("print", proc(e: EventArgs) = echo("pie"))
ee.emit("print", args)
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