Trait NodeFolder 

pub trait NodeFolder {
    type NodeTy: Node;
    type Result;

    // Required method
    fn visit_up(
        &mut self,
        _node: Self::NodeTy,
        _children: Vec<Self::Result>,
    ) -> VortexResult<FoldUp<Self::Result>>;

    // Provided method
    fn visit_down(
        &mut self,
        _node: &Self::NodeTy,
    ) -> VortexResult<FoldDown<Self::Result>> { ... }
}

This trait is used to implemet a fold (see NodeFolderContext), but without a context.

Required Associated Types

type NodeTy: Node

type Result

Required Methods

fn visit_up( &mut self, _node: Self::NodeTy, _children: Vec<Self::Result>, ) -> VortexResult<FoldUp<Self::Result>>

visit_up is called when a node is last encountered, in a pre-order traversal. If the node should stop traversal, return Stop. Otherwise, return Continue.

Provided Methods

fn visit_down( &mut self, _node: &Self::NodeTy, ) -> VortexResult<FoldDown<Self::Result>>

visit_down is called when a node is first encountered, in a pre-order traversal. If the node’s children are to be skipped, return Skip. If the node should stop traversal, return Stop. Otherwise, return Continue.

Implementors