vendor/doctrine/collections/lib/Doctrine/Common/Collections/AbstractLazyCollection.php

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<?php
/*
 * 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.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\Common\Collections;

use Closure;

/**
 * Lazy collection that is backed by a concrete collection
 *
 * @author Michaël Gallego <mic.gallego@gmail.com>
 * @since  1.2
 */
abstract class AbstractLazyCollection implements Collection
{
    /**
     * The backed collection to use
     *
     * @var Collection
     */
    protected $collection;

    /**
     * @var boolean
     */
    protected $initialized = false;

    /**
     * {@inheritDoc}
     */
    public function count()
    {
        $this->initialize();
        return $this->collection->count();
    }

    /**
     * {@inheritDoc}
     */
    public function add($element)
    {
        $this->initialize();
        return $this->collection->add($element);
    }