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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_slice<T: Clone>(a: &mut Arc<[T]>) -> &mut [T] {
if Arc::get_mut(a).is_none() {
*a = a.iter().cloned().collect();
}
Arc::get_mut(a).unwrap()
}
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