1 // Extracted from the scopeguard crate
2 use core::ops::{Deref, DerefMut};
3
4 pub struct ScopeGuard<T, F>
5 where
6 F: FnMut(&mut T),
7 {
8 dropfn: F,
9 value: T,
10 }
11
12 #[cfg_attr(feature = "inline-more", inline)]
guard<T, F>(value: T, dropfn: F) -> ScopeGuard<T, F> where F: FnMut(&mut T),13 pub fn guard<T, F>(value: T, dropfn: F) -> ScopeGuard<T, F>
14 where
15 F: FnMut(&mut T),
16 {
17 ScopeGuard { dropfn, value }
18 }
19
20 impl<T, F> Deref for ScopeGuard<T, F>
21 where
22 F: FnMut(&mut T),
23 {
24 type Target = T;
25 #[cfg_attr(feature = "inline-more", inline)]
deref(&self) -> &T26 fn deref(&self) -> &T {
27 &self.value
28 }
29 }
30
31 impl<T, F> DerefMut for ScopeGuard<T, F>
32 where
33 F: FnMut(&mut T),
34 {
35 #[cfg_attr(feature = "inline-more", inline)]
deref_mut(&mut self) -> &mut T36 fn deref_mut(&mut self) -> &mut T {
37 &mut self.value
38 }
39 }
40
41 impl<T, F> Drop for ScopeGuard<T, F>
42 where
43 F: FnMut(&mut T),
44 {
45 #[cfg_attr(feature = "inline-more", inline)]
drop(&mut self)46 fn drop(&mut self) {
47 (self.dropfn)(&mut self.value)
48 }
49 }
50