52 lines
1.4 KiB
PHP
Executable File
52 lines
1.4 KiB
PHP
Executable File
<?php
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/**
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* This file is part of the ramsey/collection library
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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* @license http://opensource.org/licenses/MIT MIT
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*/
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declare(strict_types=1);
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namespace Ramsey\Collection;
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/**
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* This class contains the basic implementation of a collection that does not
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* allow duplicated values (a set), to minimize the effort required to implement
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* this specific type of collection.
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*
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* @template T
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* @extends AbstractCollection<T>
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*/
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abstract class AbstractSet extends AbstractCollection
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{
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public function add(mixed $element): bool
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{
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if ($this->contains($element)) {
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return false;
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}
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// Call offsetSet() on the parent instead of add(), since calling
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// parent::add() will invoke $this->offsetSet(), which will call
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// $this->contains() a second time. This can cause performance issues
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// with extremely large collections. For more information, see
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// https://github.com/ramsey/collection/issues/68.
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parent::offsetSet(null, $element);
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return true;
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}
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public function offsetSet(mixed $offset, mixed $value): void
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{
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if ($this->contains($value)) {
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return;
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}
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parent::offsetSet($offset, $value);
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}
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}
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