1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

use std::ops::{Deref, DerefMut};

pub struct TailDropVec<T> {
    vec: Vec<T>,
}

impl<T> Drop for TailDropVec<T> {
    fn drop(&mut self) {
        loop {
            if let None = self.vec.pop() {
                break;
            }
        }
    }
}

impl<T> From<Vec<T>> for TailDropVec<T> {
    fn from(vec: Vec<T>) -> Self {
        TailDropVec { vec }
    }
}

impl<T> Deref for TailDropVec<T> {
    type Target = Vec<T>;

    fn deref(&self) -> &Self::Target {
        &self.vec
    }
}

impl<T> DerefMut for TailDropVec<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.vec
    }
}