diff options
Diffstat (limited to 'crates/ra_hir/src/util.rs')
-rw-r--r-- | crates/ra_hir/src/util.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/crates/ra_hir/src/util.rs b/crates/ra_hir/src/util.rs new file mode 100644 index 000000000..0095ee45d --- /dev/null +++ b/crates/ra_hir/src/util.rs | |||
@@ -0,0 +1,12 @@ | |||
1 | //! Internal utility functions. | ||
2 | |||
3 | use std::sync::Arc; | ||
4 | |||
5 | /// Helper for mutating `Arc<[T]>` (i.e. `Arc::make_mut` for Arc slices). | ||
6 | /// The underlying values are cloned if there are other strong references. | ||
7 | pub(crate) fn make_mut_slice<T: Clone>(a: &mut Arc<[T]>) -> &mut [T] { | ||
8 | if Arc::get_mut(a).is_none() { | ||
9 | *a = a.iter().cloned().collect(); | ||
10 | } | ||
11 | Arc::get_mut(a).unwrap() | ||
12 | } | ||