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//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
//! Filter -> FailableFilter implementations
//!
//! Will be automatically included when incluing `filter::Filter`, so importing this module
//! shouldn't be necessary.
//!
use std::marker::PhantomData;
use filter::Filter;
use failable::filter::FailableFilter;
#[must_use = "filters are lazy and do nothing unless consumed"]
#[derive(Clone)]
pub struct IntoFailable<F, E>(F, PhantomData<E>);
impl<F, E> IntoFailable<F, E> {
pub fn new(a: F) -> IntoFailable<F, E> {
IntoFailable(a, PhantomData)
}
}
impl<F, N, E> FailableFilter<N, E> for IntoFailable<F, E>
where F: Filter<N>,
{
fn filter(&self, e: &N) -> Result<bool, E> {
Ok(self.0.filter(e))
}
}
#[must_use = "filters are lazy and do nothing unless consumed"]
#[derive(Clone)]
pub struct AsFailable<'a, F: 'a + ?Sized, E>(&'a F, PhantomData<E>);
impl<'a, F: 'a + ?Sized, E> AsFailable<'a, F, E> {
pub fn new(a: &'a F) -> AsFailable<F, E> {
AsFailable(a, PhantomData)
}
}
impl<'a, F, N, E> FailableFilter<N, E> for AsFailable<'a, F, E>
where F: Filter<N> + 'a + ?Sized,
{
fn filter(&self, e: &N) -> Result<bool, E> {
Ok(self.0.filter(e))
}
}
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