fn_traits/fns/
convert_identity_fn.rs

1use crate::{Fn, FnMut, FnOnce};
2use core::convert;
3use core::marker::PhantomData;
4
5/// [`convert::identity`] function.
6#[derive(Clone, Copy, Default)]
7pub struct ConvertIdentityFn {
8    _phantom: PhantomData<()>,
9}
10
11impl<T> FnOnce<(T,)> for ConvertIdentityFn {
12    type Output = T;
13
14    fn call_once(self, args: (T,)) -> Self::Output {
15        convert::identity(args.0)
16    }
17}
18
19impl<T> FnMut<(T,)> for ConvertIdentityFn {
20    type Output = T;
21
22    fn call_mut(&mut self, args: (T,)) -> Self::Output {
23        self.call_once(args)
24    }
25}
26
27impl<T> Fn<(T,)> for ConvertIdentityFn {
28    type Output = T;
29
30    fn call(&self, args: (T,)) -> Self::Output {
31        self.call_once(args)
32    }
33}
34
35#[cfg(test)]
36mod tests {
37    use super::super::tests::{into_std_fn, into_std_fn_mut, into_std_fn_once};
38    use super::ConvertIdentityFn;
39
40    #[test]
41    fn test_convert_identity_fn() {
42        let f = ConvertIdentityFn::default();
43
44        assert_eq!(into_std_fn_once(Clone::clone(&f))(2), 2);
45        assert_eq!(into_std_fn_mut(Clone::clone(&f))(2), 2);
46        assert_eq!(into_std_fn(Clone::clone(&f))(2), 2);
47    }
48}
fn_traits/fns/convert_identity_fn.rs

fn_traits/fns/
convert_identity_fn.rs
