Struct id_tree::NodeBuilder

pub struct NodeBuilder<T> { /* fields omitted */ }

A Node builder that provides more control over how a Node is created.

Implementations

impl<T> NodeBuilder<T>

pub fn new(data: T) -> NodeBuilder<T>

Creates a new NodeBuilder with the required data.

use id_tree::NodeBuilder;

let _node_builder = NodeBuilder::new(5);

pub fn with_child_capacity(self, child_capacity: usize) -> NodeBuilder<T>

Set the child capacity of the NodeBuilder.

As Nodes are added to a Tree, parent and child references must be maintained. To do this, an allocation must be made every time a child is added to a Node. Using this setting allows the Node to pre-allocate space for its children so that the allocations aren’t made as children are added.

Use of this setting is recommended if you know the maximum number of children (not including grandchildren, great-grandchildren, etc.) that a Node will have at any given time.

use id_tree::NodeBuilder;

let _node_builder = NodeBuilder::new(5).with_child_capacity(3);

pub fn build(self) -> Node<T>

Build a Node based upon the current settings in the NodeBuilder.

use id_tree::NodeBuilder;
use id_tree::Node;

let node: Node<i32> = NodeBuilder::new(5)
        .with_child_capacity(3)
        .build();

assert_eq!(node.data(), &5);
assert_eq!(node.children().capacity(), 3);