Struct BoxedHandler 

pub struct BoxedHandler<Ctx, R>(/* private fields */);

A type-erased handler that owns a Box<dyn Fn(...)>.

Use this only when you need to store handlers in a collection or return them from a function with an erased type. In hot paths, prefer the zero-cost combinator structs.

Constructed via HandlerExt::boxed.

Example

use tree_sitter_utils::{handler_fn, HandlerExt, BoxedHandler, Input};

let h: BoxedHandler<(), String> =
    handler_fn(|_: Input<()>| "hello".to_owned()).boxed();
let _ = h;

Implementations

impl<Ctx, R> BoxedHandler<Ctx, R>

pub fn new<F>(f: F) -> Self

where F: for<'tree> Fn(Input<'tree, Ctx>) -> HandlerResult<R> + Send + Sync + 'static,

Wrap a boxed closure as a BoxedHandler.

Trait Implementations

impl<Ctx, R> Handler<Ctx, R> for BoxedHandler<Ctx, R>

where Ctx: Copy,

fn handle<'tree>(&self, input: Input<'tree, Ctx>) -> HandlerResult<R>

Attempt to produce an output value for the given input.