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