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<?php

class Shippo_Util_Set
{
    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]);
    }
    
    // TODO: make Set support foreach
    public function toArray()
    {
        return array_keys($this->_elts);
    }
}