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Edit File: AbstractSet.php

<?php

/**
 * This file is part of the ramsey/collection library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Collection;

/**
 * This class contains the basic implementation of a collection that does not
 * allow duplicated values (a set), to minimize the effort required to implement
 * this specific type of collection.
 *
 * @template T
 * @extends AbstractCollection<T>
 */
abstract class AbstractSet extends AbstractCollection
{
    public function add(mixed $element): bool
    {
        if ($this->contains($element)) {
            return false;
        }

// Call offsetSet() on the parent instead of add(), since calling
        // parent::add() will invoke $this->offsetSet(), which will call
        // $this->contains() a second time. This can cause performance issues
        // with extremely large collections. For more information, see
        // https://github.com/ramsey/collection/issues/68.
        parent::offsetSet(null, $element);

return true;
    }

public function offsetSet(mixed $offset, mixed $value): void
    {
        if ($this->contains($value)) {
            return;
        }

parent::offsetSet($offset, $value);
    }
}