r_ex/
from_ref.rs

1pub trait FromRef<T>: Sized {
2    fn from_ref(_: &T) -> Self;
3}
4
5impl<T: Clone, U: From<T>> FromRef<T> for U {
6    #[inline]
7    fn from_ref(val_ref: &T) -> Self {
8        let val = val_ref.clone();
9        Self::from(val)
10    }
11}
12
13pub trait RefInto<T: Sized>: Clone {
14    fn ref_into(&self) -> T;
15}
16
17impl<T, U: Into<T> + Clone> RefInto<T> for U {
18    #[inline]
19    fn ref_into(&self) -> T {
20        let val = self.clone();
21        val.into()
22    }
23}
24
25#[cfg(test)]
26mod tests {
27    use crate::prelude::*;
28
29    #[test]
30    #[allow(unused_must_use)]
31    fn from_ref() {
32        let a = 0u8;
33
34        u16::from(a);
35
36        u16::from_ref(&a);
37
38        let mut a = 0u8;
39
40        u16::from_ref(&mut a);
41    }
42
43    // TODO more tests
44}
r_ex/from_ref.rs

r_ex/
from_ref.rs
