ttools - [no description]


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use core::ops::{FromResidual, Residual, Try};

use crate::{Pick, Tupl};

macro_rules! option_of_ref_to_tuple {
    ($name1:ident, $name2:ident, $as_ref:ident, $AsRef:ident $(, $mut:tt)?) => {

pub trait $name1<'a, T: Tupl + 'a>: Try<Output = &'a $($mut)? T> + Sized {
    fn on<const N: usize>(
        self,
    ) -> ChangeOutputType<Self, <T::$AsRef<'a> as Pick<N>>::At>
    where
        <T as Tupl>::$AsRef<'a>: Pick<N>,
        Self:
            Try<Residual: Residual<<T::$AsRef<'a> as Pick<N>>::At> + Sized>,
    {
        match self.branch() {
            core::ops::ControlFlow::Continue(x) =>
                <_>::from_output(x.$as_ref().pick()),
            core::ops::ControlFlow::Break(x) => <_>::from_residual(x),
        }
    }
}
impl<'a, T: Tupl + 'a, R: Try<Output = &'a $($mut)? T>> $name1<'a, T> for R {}
    };
}
pub trait TryTuple<T: Tupl>: Try<Output = T> {
    fn on<const N: usize>(self) -> ChangeOutputType<Self, T::At>
    where
        T: Pick<N>,
        Self: Try<Residual: Residual<T::At>> + Sized,
    {
        match self.branch() {
            core::ops::ControlFlow::Continue(x) =>
                <_>::from_output(x.pick()),
            core::ops::ControlFlow::Break(x) => <_>::from_residual(x),
        }
    }
}
pub type ChangeOutputType<T: Try<Residual: Residual<V>>, V> =
    <T::Residual as Residual<V>>::TryType;

impl<T: Tupl, Tr: Try<Output = T>> TryTuple<T> for Tr {}

// impl<T: Tupl, Tr: Try<Output = T>> TryTuple<T> for Tr {}
// impl<T: Tupl, Tr: Try<Output = T>> TryTuple<T> for Tr {}

option_of_ref_to_tuple!(
    TryRefTuple,
    OptionOfRefToTupleWithF,
    as_ref,
    AsRef
);

option_of_ref_to_tuple!(
    TryRefMutTuple,
    OptionOfMutRefToTupleWithF,
    as_mut,
    AsMut,
    mut
);

#[test]
fn x() {
    struct Y;
    let x = Some(&mut (Y, 2));
    let x = x.on::<1>();
    let x = &mut Some((Y, 2));
    let x = x.as_mut().on::<1>();
    let x = (&Ok::<_, ()>((Y, Y))).as_ref().on::<1>();
}