(PECL ds >= 1.0.0)
Ds\Deque::__construct — Creates a new instance
    Creates a new instance, using either a traversable
    object or an array for the initial values.
  
valuesA traversable object or an array to use for the initial values.
示例 #1 Ds\Deque::__construct() example
<?php
$deque = new \Ds\Deque();
var_dump($deque);
$deque = new \Ds\Deque([1, 2, 3]);
var_dump($deque);
?>以上示例的输出类似于:
object(Ds\Deque)#2 (0) {
}
object(Ds\Deque)#2 (3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}
