Trait Visitor 

pub trait Visitor {
    type Output;
    type Err;

    // Required method
    fn finish(self) -> Result<Self::Output, Self::Err>;

    // Provided methods
    fn enter(&mut self, _node: Cursor<'_>) -> Result<Flow, Self::Err> { ... }
    fn leave(&mut self, _node: Cursor<'_>) -> Result<(), Self::Err> { ... }
}

Required Associated Types

type Output

type Err

Required Methods

fn finish(self) -> Result<Self::Output, Self::Err>

Consume the visitor and return its output.

Errors

Implementations may return their visitor-specific error.

Provided Methods

fn enter(&mut self, _node: Cursor<'_>) -> Result<Flow, Self::Err>

Called before visiting a node’s children.

Errors

Implementations may return their visitor-specific error.

fn leave(&mut self, _node: Cursor<'_>) -> Result<(), Self::Err>

Called after visiting a node’s children.

Errors

Implementations may return their visitor-specific error.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors