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use std::convert::Infallible;
use std::iter::Map;
use super::*;
impl<I, T, E> QuadSource for I
where
I: Iterator<Item = Result<T, E>>,
T: Quad,
E: 'static + Error,
{
type Error = E;
type Quad = ByValue<T>;
fn try_for_some_quad<F, EF>(&mut self, f: &mut F) -> StreamResult<bool, E, EF>
where
F: FnMut(StreamedQuad<Self::Quad>) -> Result<(), EF>,
EF: Error,
{
match self.next() {
Some(Ok(quad)) => f(StreamedQuad::by_value(quad))
.map_err(SinkError)
.and(Ok(true)),
Some(Err(err)) => Err(SourceError(err)),
None => Ok(false),
}
}
}
pub type AsInfallibleSource<I, T> = Map<I, fn(T) -> Result<T, Infallible>>;
pub trait AsQuadSource<T>: Sized {
fn as_quad_source(self) -> AsInfallibleSource<Self, T>;
}
impl<T, I> AsQuadSource<T> for I
where
I: Iterator<Item = T> + Sized,
T: Quad,
{
fn as_quad_source(self) -> AsInfallibleSource<Self, T> {
self.map(Ok)
}
}