WordPress at a glance
function is not described

update_post_caches() WP 1.5.0

Call major cache updating functions for list of Post objects.

No Hooks.

Return

Nothing (null).

Usage

update_post_caches( &$posts, $post_type, $update_term_cache, $update_meta_cache );
$posts(array) (required)
Array of Post objects
$post_type(string)
Post type.
Default: 'post'
$update_term_cache(true/false)
Whether to update the term cache.
Default: true
$update_meta_cache(true/false)
Whether to update the meta cache.
Default: true

Code of update post caches: wp-includes/post.php VER 5.0.3

<?php
function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
	// No point in doing all this work if we didn't match any posts.
	if ( !$posts )
		return;

	update_post_cache($posts);

	$post_ids = array();
	foreach ( $posts as $post )
		$post_ids[] = $post->ID;

	if ( ! $post_type )
		$post_type = 'any';

	if ( $update_term_cache ) {
		if ( is_array($post_type) ) {
			$ptypes = $post_type;
		} elseif ( 'any' == $post_type ) {
			$ptypes = array();
			// Just use the post_types in the supplied posts.
			foreach ( $posts as $post ) {
				$ptypes[] = $post->post_type;
			}
			$ptypes = array_unique($ptypes);
		} else {
			$ptypes = array($post_type);
		}

		if ( ! empty($ptypes) )
			update_object_term_cache($post_ids, $ptypes);
	}

	if ( $update_meta_cache )
		update_postmeta_cache($post_ids);
}