Highlight current post in the loop

gistfile1.php

<?php

function highlight_current_post( $classes ) {
    global $post, $wp_query;

	if( $post->ID == $wp_query->post->ID ) {
		$classes[] = 'current-post';
	}

	return $classes;
}
add_filter( 'post_class', 'highlight_current_post' );