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<?php

class Stripe_Util_Set implements IteratorAggregate
{
    private $_elts;

    public function __construct($members = array())
    {
        $this->_elts = array();
        foreach ($members as $item) {
            $this->_elts[$item] = true;
        }
    }

    public function includes($elt)
    {
        return isset($this->_elts[$elt]);
    }

    public function add($elt)
    {
        $this->_elts[$elt] = true;
    }

    public function discard($elt)
    {
        unset($this->_elts[$elt]);
    }

    public function toArray()
    {
        return array_keys($this->_elts);
    }

    public function getIterator()
    {
        return new ArrayIterator($this->toArray());
    }
}