pub trait Drop {
fn drop(&mut self);
}
The Drop trait is used to run some code when a value goes out of scope. This is sometimes called a 'destructor'.
A trivial implementation of Drop. The drop method is called when _x goes out of scope, and therefore main prints Dropping!.
struct HasDrop;
impl Drop for HasDrop {
fn drop(&mut self) {
println!("Dropping!");
}
}
fn main() {
let _x = HasDrop;
} fn drop(&mut self)A method called when the value goes out of scope.
When this method has been called, self has not yet been deallocated. If it were, self would be a dangling reference.
After this function is over, the memory of self will be deallocated.
This function cannot be called explicitly. This is compiler error E0040. However, the std::mem::drop function in the prelude can be used to call the argument's Drop implementation.
Given that a panic! will call drop() as it unwinds, any panic! in a drop() implementation will likely abort.
impl<'a, T> Drop for PeekMut<'a, T> where T: Ordimpl<K, V> Drop for BTreeMap<K, V>impl<K, V> Drop for std::collections::btree_map::IntoIter<K, V>impl<T> Drop for LinkedList<T>impl<'a> Drop for std::string::Drain<'a>impl<T> Drop for Vec<T>impl<T> Drop for std::vec::IntoIter<T>impl<'a, T> Drop for std::vec::Drain<'a, T>impl<T> Drop for VecDeque<T>impl<'a, T> Drop for std::collections::vec_deque::Drain<'a, T> where T: 'aimpl<T> Drop for IntermediateBox<T> where T: ?Sizedimpl<T> Drop for Box<T> where T: ?Sizedimpl<T> Drop for Arc<T> where T: ?Sizedimpl<T> Drop for std::sync::Weak<T> where T: ?Sizedimpl<T> Drop for Rc<T> where T: ?Sizedimpl<T> Drop for std::rc::Weak<T> where T: ?Sizedimpl<T> Drop for RawVec<T>impl Drop for CStringimpl<W: Write> Drop for BufWriter<W>impl Drop for Selectimpl<'rx, T: Send> Drop for Handle<'rx, T>impl<T> Drop for Sender<T>impl<T> Drop for SyncSender<T>impl<T> Drop for Receiver<T>impl Drop for Condvarimpl<T: ?Sized> Drop for Mutex<T>impl<'a, T: ?Sized> Drop for MutexGuard<'a, T>impl<T: ?Sized> Drop for RwLock<T>impl<'a, T: ?Sized> Drop for RwLockReadGuard<'a, T>impl<'a, T: ?Sized> Drop for RwLockWriteGuard<'a, T>
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ops/trait.Drop.html