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//! Internal utility functions.
use std::sync::Arc;
/// Helper for mutating `Arc<[T]>` (i.e. `Arc::make_mut` for Arc slices).
/// The underlying values are cloned if there are other strong references.
pub(crate) fn make_mut_arc_slice<T: Clone, R>(
a: &mut Arc<[T]>,
f: impl FnOnce(&mut [T]) -> R,
) -> R {
if let Some(s) = Arc::get_mut(a) {
f(s)
} else {
let mut v = a.to_vec();
let r = f(&mut v);
*a = Arc::from(v);
r
}
}
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