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<?php /** * Hoa * * * @license * * New BSD License * * Copyright © 2007-2017, Hoa community. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the Hoa nor the names of its contributors may be * used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ namespace Hoa\Iterator; /** * Class \Hoa\Iterator\CallbackGenerator. * * Yield a value based on a callback. * * @copyright Copyright © 2007-2017 Hoa community * @license New BSD License */ class CallbackGenerator implements Iterator { /** * Callback. * * @var callable */ protected $_callback = null; /** * Current key. * * @var mixed */ protected $_key = 0; /** * Current computed value. * * @var mixed */ protected $_current = null; /** * Constructor. * * @param callable $callback Callback. */ public function __construct(callable $callback) { $this->_callback = $callback; return; } /** * Return the current element. * * @return mixed */ public function current() { $handle = $this->_callback; return $this->_current = $handle($this->_key); } /** * Return the key of the current element. * * @return mixed */ public function key() { return $this->_key; } /** * Move forward to next element. * * @return void */ public function next() { ++$this->_key; return; } /** * Rewind the iterator to the first element. * * @return void */ public function rewind() { $this->_key = 0; $this->_current = null; return; } /** * Check if current position is valid. * * @return bool */ public function valid() { return true; } }
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