<?php

namespace alveolata\observer;


/**
 */
class struct {
	
	/**
	 * @var array {map<string,any>}
	 */
	public $listeners;
	
	
	/**
	 * @array {map<string,any>}
	 */
	public function __construct(
		array $listeners
	)
	{
		$this->listeners = $listeners;
	}
	
}


/**
 * @return struct
 */
function make(
) : struct
{
	return (
		new struct([])
	);
}


/**
 * @param struct $subject
 * @param \Closure $procedure {function<any,void>}
 */
function register(
	struct $subject,
	\Closure $procedure
) : string
{
	$count = count($subject->listeners);
	$id = sprintf('listener_%d', $count);
	$subject->listeners[$id] = $procedure;
	return $id;
}


/**
 * @param struct $subject
 * @param mixed $data {any}
 */
function notify(
	struct $subject,
	$data
)/* : void*/
{
	$result = [];
	foreach ($subject->listeners as $id => $procedure) {
		$result[$id] = $procedure($data);
	}
	return $result;
}

 ?>