Multiselect.php

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<?php
namespace Magento\Customer\Model\Config\Source\Group;

use Magento\Customer\Model\Customer\Attribute\Source\GroupSourceLoggedInOnlyInterface;
use Magento\Customer\Api\GroupManagementInterface;
use Magento\Framework\App\ObjectManager;

class Multiselect implements \Magento\Framework\Option\ArrayInterface
{
    protected $_options;

    protected $_groupManagement;

    protected $_converter;

    private $groupSourceLoggedInOnly;

    public function __construct(
        GroupManagementInterface $groupManagement,
        \Magento\Framework\Convert\DataObject $converter,
        GroupSourceLoggedInOnlyInterface $groupSourceLoggedInOnly = null
    ) {
        $this->_groupManagement = $groupManagement;
        $this->_converter = $converter;
        $this->groupSourceLoggedInOnly = $groupSourceLoggedInOnly
            ?: ObjectManager::getInstance()->get(GroupSourceLoggedInOnlyInterface::class);
    }

    public function toOptionArray()
    {
        if (!$this->_options) {
            $this->_options = $this->groupSourceLoggedInOnly->toOptionArray();
        }
        return $this->_options;
    }
}