function bbp_get_public_child_ids( $parent_id = 0, $post_type = 'post' ) {

	// Bail if nothing passed
	if ( empty( $parent_id ) || empty( $post_type ) ) {
		return array();
	}

	// Which statuses
	switch ( $post_type ) {

		// Forum
		case bbp_get_forum_post_type() :
			$post_status = bbp_get_public_forum_statuses();
			break;

		// Topic
		case bbp_get_topic_post_type() :
			$post_status = bbp_get_public_topic_statuses();
			break;

		// Reply
		case bbp_get_reply_post_type() :
		default :
			$post_status = bbp_get_public_reply_statuses();
			break;
	}

	$query = new WP_Query( array(
		'fields'         => 'ids',
		'post_parent'    => $parent_id,
		'post_status'    => $post_status,
		'post_type'      => $post_type,
		'posts_per_page' => -1,
		'orderby'        => array(
			'post_date' => 'DESC',
			'ID'        => 'DESC'
		),

		// Performance
		'nopaging'               => true,
		'suppress_filters'       => true,
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false,
		'ignore_sticky_posts'    => true,
		'no_found_rows'          => true
	) );

	$child_ids = ! empty( $query->posts )
		? $query->posts
		: array();

	unset( $query );

	// Filter & return
	return (array) apply_filters( 'bbp_get_public_child_ids', $child_ids, $parent_id, $post_type );
}