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fixed_len_vec: Deref to slice

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Michael Sproul 2019-05-21 11:53:29 +10:00
parent 56424d94c6
commit 9a21e41017
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GPG Key ID: 77B1309D2E54E914
1 changed files with 19 additions and 1 deletions
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20
eth2/utils/fixed_len_vec/src/lib.rs
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@ -1,6 +1,6 @@
use serde_derive::{Deserialize, Serialize}; use serde_derive::{Deserialize, Serialize};
use std::marker::PhantomData; use std::marker::PhantomData;
use std::ops::{Index, IndexMut}; use std::ops::{Deref, Index, IndexMut};
use std::slice::SliceIndex; use std::slice::SliceIndex;
use typenum::Unsigned; use typenum::Unsigned;
@ -70,6 +70,14 @@ impl<T, N: Unsigned, I: SliceIndex<[T]>> IndexMut<I> for FixedLenVec<T, N> {
} }
} }
impl<T, N: Unsigned> Deref for FixedLenVec<T, N> {
type Target = [T];
fn deref(&self) -> &[T] {
&self.vec[..]
}
}
#[cfg(test)] #[cfg(test)]
mod test { mod test {
use super::*; use super::*;
@ -104,6 +112,16 @@ mod test {
let fixed: FixedLenVec<u64, U4> = FixedLenVec::from(vec.clone()); let fixed: FixedLenVec<u64, U4> = FixedLenVec::from(vec.clone());
assert_eq!(&fixed[..], &vec![0, 0, 0, 0][..]); assert_eq!(&fixed[..], &vec![0, 0, 0, 0][..]);
} }
#[test]
fn deref() {
let vec = vec![0, 2, 4, 6];
let fixed: FixedLenVec<u64, U4> = FixedLenVec::from(vec);
assert_eq!(fixed.get(0), Some(&0));
assert_eq!(fixed.get(3), Some(&6));
assert_eq!(fixed.get(4), None);
}
} }
#[cfg(test)] #[cfg(test)]