mirror of
https://github.com/opencultureconsulting/php-basics.git
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70 lines
2.1 KiB
PHP
70 lines
2.1 KiB
PHP
<?php
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/**
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* Useful PHP Basics
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* Copyright (C) 2023 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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declare(strict_types=1);
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namespace OCC\Basics\DataStructures;
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use RuntimeException;
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/**
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* A type-sensitive, taversable First In, First Out Queue (FIFO).
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*
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* @author Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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* @package opencultureconsulting/basics
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*
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* @implements \ArrayAccess
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* @implements \Countable
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* @implements \Iterator
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* @implements \Serializable
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*/
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class StrictQueue extends StrictList
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{
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/**
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* Set the mode of iteration.
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* @see SplDoublyLinkedList::setIteratorMode()
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*
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* @param int $mode The new iterator mode (0 or 1)
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*
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* @return int The set of flags and modes of iteration
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*
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* @throws \RuntimeException
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*/
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final public function setIteratorMode(int $mode): int
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{
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if ($mode > 1) {
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throw new RuntimeException('Changing the iterator direction of ' . static::class . ' is prohibited.');
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}
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return parent::setIteratorMode($mode);
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}
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/**
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* Create a type-sensitive, traversable queue of items.
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*
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* @param iterable $items Initial set of items
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* @param string[] $allowedTypes Allowed types of items (optional)
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*/
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public function __construct(iterable $items = [], array $allowedTypes = [])
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{
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parent::__construct($items, $allowedTypes);
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$this->setIteratorMode(0);
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}
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}
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