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trait SwapCarriable { | |
type Out; | |
fn swap_carry(self) -> Self::Out; | |
} | |
impl<T> SwapCarriable for Vec<Option<T>> { | |
type Out = Option<Vec<T>>; | |
fn swap_carry(self) -> Option<Vec<T>> { | |
let mut buf = Vec::with_capacity(self.len()); | |
for e in self { | |
match e { | |
Some(e) => buf.push(e), | |
None => return None, | |
} | |
} | |
Some(buf) | |
} | |
} | |
impl<T, E> SwapCarriable for Vec<Result<T, E>> { | |
type Out = Result<Vec<T>, E>; | |
fn swap_carry(self) -> Result<Vec<T>, E> { | |
let mut buf = Vec::with_capacity(self.len()); | |
for e in self { | |
buf.push(e?) | |
} | |
Ok(buf) | |
} | |
} | |
fn main() { | |
println!("{:?}", vec![Some(10), None].swap_carry()); | |
println!("{:?}", vec![Ok(10), Ok(2)].swap_carry()); | |
} |
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