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 5.1.1

<?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 );
	}
}