カスタム投稿タイプの投稿一覧で現在表示にcurrentを持たせる

wp_list_custompost_posts.php

<ul>
<?php
$current_page_id = $wp_query->get_queried_object_id();
$args = array(
	'post_type' => 'yourcustomposttype',
);
$your_posts = get_posts($args);
foreach ( $your_posts as $post ) {
	setup_postdata($post);
	$current_class = null;
	$listed_page_id = null;
	$listed_page_id = $post->ID;
	if ( $listed_page_id == $current_page_id ) {
		$current_class = ' current_page_item';
	}
	?>
	<li class="page_item<?php echo $current_class; ?>"><a href="<?php the_permalink() ?>"><?php the_title() ?></a></li>
<?php
}	
?>
</ul>