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<?php
/**
 * This file is part of PDepend.
 *
 * PHP Version 5
 *
 * Copyright (c) 2008-2017 Manuel Pichler <[email protected]>.
 * 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 Manuel Pichler nor the names of his
 *     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 OWNER OR 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.
 *
 * @copyright 2008-2017 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 *
 * @since 1.0.0
 */

namespace PDepend\Source\AST;

use PDepend\Source\ASTVisitor\ASTVisitor;

/**
 * This class represents a single array element expression.
 *
 * <code>
 * //              _  ______  __________________________
 * //                                __  ___  __________
 * $array = array( 1, 2 => 3, array( $a, &$b, 1 => &$c ) );
 *
 * //         _  ______  _____________________
 * //                      __  ___  ________
 * $array = [ 1, 2 => 3, [ $a, &$b, 1 => &$c ] ];
 * </code>
 *
 * @copyright 2008-2017 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 *
 * @since 1.0.0
 */
class ASTArrayElement extends ASTExpression
{
    /**
     * This method will return <b>true</b> when the element value is passed by
     * reference.
     *
     * @return bool
     */
    public function isByReference()
    {
        return $this->getMetadataBoolean(5);
    }

    /**
     * This method can be used to mark the element value as passed by reference.
     *
     * @return void
     */
    public function setByReference()
    {
        $this->setMetadataBoolean(5, true);
    }

    /**
     * Returns the total number of the used property bag.
     *
     * @return int
     *
     * @since  0.10.4
     * @see    ASTNode#getMetadataSize()
     */
    protected function getMetadataSize()
    {
        return 6;
    }
}