diff options
Diffstat (limited to 'src/filter.rs')
| -rw-r--r-- | src/filter.rs | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/src/filter.rs b/src/filter.rs index ac0d7b1..d2748bd 100644 --- a/src/filter.rs +++ b/src/filter.rs @@ -6,12 +6,14 @@ //! The filter implementation //! +use std::borrow::Borrow; pub use ops::and::And; pub use ops::bool::Bool; pub use ops::not::Not; pub use ops::xor::XOr; pub use ops::or::Or; +pub use ops::map::MapInput; /// Trait for converting something into a Filter pub trait IntoFilter<N> { @@ -36,7 +38,7 @@ impl<I, T: Fn(&I) -> bool> Filter<I> for T { } } -/// The filter trai +/// The filter trait pub trait Filter<N> { /// The function which is used to filter something @@ -256,6 +258,29 @@ pub trait Filter<N> { Not::new(And::new(self, other)) } + /// Helper to transform the input of a filter + /// + /// ``` + /// use filters::filter::Filter; + /// + /// let a = (|&a: &usize| { a > 1 }); + /// let b = (|&a: &i64| { a < 7 }); + /// let b = b.map_input(|&x: &usize| { x as i64 }); + /// let c = a.and(b); + /// + /// assert!(!c.filter(&1)); + /// assert!(c.filter(&3)); + /// assert!(c.filter(&4)); + /// assert!(c.filter(&6)); + /// assert!(!c.filter(&9)); + /// ``` + fn map_input<O, B, T, M>(self, map: M) -> MapInput<Self, M, O, B> + where Self: Sized, + M: Fn(&T) -> N, + B: Borrow<O> + Sized + { + MapInput::new(self, map) + } } |