If you're thinking of using WP_Query, try using this iterator instead, cleaner boilerplate, auto-cleans up after itself

gistfile1.php

<?php

$pages = new query_loop( array(
	'post_type' => 'page'
));
foreach( $pages as $id => $post ) {
	the_title();
	// etc...
}


// put this below in your functions.php:
/**
 * WordPress Main Posts Loop Iterator
 */
class query_loop implements Iterator {
	public function __construct( $args = array() ) {
		$this->query = new WP_Query( $args );
	}

	function rewind() {
		$this->query->rewind_posts();
	}

	function current() {
		return $this->query->post;
	}

	function key() {
		return $this->query->post->ID;
	}

	function next() {
		$this->query->the_post();
	}

	function valid() {
		if ( $this->query->have_posts() ) {
			return true;
		} else {
			wp_reset_postdata();
			return false;
		}
	}
}