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causal-agent/rust-extending-type.rs

Created August 22, 2016 23:06
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rust-extending-type.rs
use std::ops::{Range, RangeFrom, RangeTo};
pub trait RangeExt<T> {
fn before(&self) -> RangeTo<T>;
fn after(&self) -> RangeFrom<T>;
}
impl<T: Copy> RangeExt<T> for Range<T> {
fn before(&self) -> RangeTo<T> {
..self.start
}
fn after(&self) -> RangeFrom<T> {
self.end..
}
}
#[cfg(test)]
mod tests {
use super::RangeExt;
#[test]
fn range_ext() {
assert_eq!(..3, (3..5).before());
assert_eq!(5.., (3..5).after());
}
}
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