visit-rs 0.1.0

A generic visitor pattern library for Rust
Documentation 
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use std::any::Any;
use std::marker::PhantomData;

use futures::Stream;

pub use visit_rs_derive::*;

#[cfg(feature = "serde")]
pub mod serde;

pub mod lib {
    pub use async_stream;
    pub use futures;
}

pub trait Visitor {
    type Result;
}

pub trait Visit<V: Visitor> {
    fn visit(&self, visitor: &mut V) -> V::Result;
}

pub trait VisitAsync<V: Visitor> {
    fn visit_async<'a>(&'a self, visitor: &'a mut V) -> impl Future<Output = V::Result> + Send + 'a
    where
        V: Send,
        V::Result: Send;
}
impl<T, V: Visitor> VisitAsync<V> for T
where
    T: Visit<V>,
{
    fn visit_async<'a>(&'a self, visitor: &'a mut V) -> impl Future<Output = V::Result> + Send + 'a
    where
        V: Send,
        V::Result: Send,
    {
        let res = self.visit(visitor);
        async move { res }
    }
}

pub trait VisitFields<V: Visitor> {
    fn visit_fields<'a>(&'a self, visitor: &'a mut V) -> impl Iterator<Item = V::Result> + 'a;
}

pub trait VisitFieldsAsync<V: Visitor> {
    fn visit_fields_async<'a>(
        &'a self,
        visitor: &'a mut V,
    ) -> impl Stream<Item = V::Result> + Send + 'a
    where
        V: Send,
        V::Result: Send;
}

pub trait VisitFieldsNamed<V: Visitor> {
    fn visit_fields_named<'a>(&'a self, visitor: &'a mut V)
        -> impl Iterator<Item = V::Result> + 'a;
}

pub trait VisitFieldsNamedAsync<V: Visitor> {
    fn visit_fields_named_async<'a>(
        &'a self,
        visitor: &'a mut V,
    ) -> impl Stream<Item = V::Result> + Send + 'a
    where
        V: Send,
        V::Result: Send;
}

pub struct Named<'a, T> {
    pub name: Option<&'static str>,
    pub value: &'a T,
}

pub struct NamedMut<'a, T> {
    pub name: Option<&'static str>,
    pub value: &'a mut T,
}