# `null_tree_node_update` Interface

A "null" node updater, indicating that no node updates are required.

Interface::Concepts::Null Policy Classes explains the concept of a null policy.

Defined in: `tree_policy.hpp`

## Template Parameters

Parameter | Description | Default Value
    class Const_Node_Iterator
| Const node iterator type. | -
    class Node_Iterator
| Node iterator type. | -
    class Cmp_Fn
| Comparison functor. | -
    class Allocator
| Allocator type. | -