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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061// SPDX-License-Identifier: Apache-2.0 OR MIT
use std::iter;use std::mem::ManuallyDrop;use std::ops::{Deref, DerefMut};use std::option;use std::slice;
#[repr(transparent)]pub(crate) struct NoDrop<T: ?Sized>(ManuallyDrop<T>);
impl<T> NoDrop<T> { pub(crate) fn new(value: T) -> Self where T: TrivialDrop, { NoDrop(ManuallyDrop::new(value)) }}
impl<T: ?Sized> Deref for NoDrop<T> { type Target = T; fn deref(&self) -> &Self::Target { &self.0 }}
impl<T: ?Sized> DerefMut for NoDrop<T> { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 }}
pub(crate) trait TrivialDrop {}
impl<T> TrivialDrop for iter::Empty<T> {}impl<T> TrivialDrop for slice::Iter<'_, T> {}impl<T> TrivialDrop for slice::IterMut<'_, T> {}impl<T> TrivialDrop for option::IntoIter<&T> {}impl<T> TrivialDrop for option::IntoIter<&mut T> {}
#[test]fn test_needs_drop() { use std::mem::needs_drop;
struct NeedsDrop;
impl Drop for NeedsDrop { fn drop(&mut self) {} }
assert!(needs_drop::<NeedsDrop>());
// Test each of the types with a handwritten TrivialDrop impl above. assert!(!needs_drop::<iter::Empty<NeedsDrop>>()); assert!(!needs_drop::<slice::Iter<NeedsDrop>>()); assert!(!needs_drop::<slice::IterMut<NeedsDrop>>()); assert!(!needs_drop::<option::IntoIter<&NeedsDrop>>()); assert!(!needs_drop::<option::IntoIter<&mut NeedsDrop>>());}