1.20.0[][src]Struct core::mem::ManuallyDrop

#[lang = "manually_drop"]
#[repr(transparent)]pub struct ManuallyDrop<T: ?Sized> { /* fields omitted */ }

A wrapper to inhibit compiler from automatically calling T’s destructor. This wrapper is 0-cost.

ManuallyDrop<T> is subject to the same layout optimizations as T. As a consequence, it has no effect on the assumptions that the compiler makes about its contents. For example, initializing a ManuallyDrop<&mut T> with mem::zeroed is undefined behavior. If you need to handle uninitialized data, use MaybeUninit<T> instead.

Note that accessing the value inside a ManuallyDrop<T> is safe. This means that a ManuallyDrop<T> whose content has been dropped must not be exposed through a public safe API. Correspondingly, ManuallyDrop::drop is unsafe.

ManuallyDrop and drop order.

Rust has a well-defined drop order of values. To make sure that fields or locals are dropped in a specific order, reorder the declarations such that the implicit drop order is the correct one.

It is possible to use ManuallyDrop to control the drop order, but this requires unsafe code and is hard to do correctly in the presence of unwinding.

For example, if you want to make sure that a specific field is dropped after the others, make it the last field of a struct:

struct Context;

struct Widget {
    children: Vec<Widget>,
    // `context` will be dropped after `children`.
    // Rust guarantees that fields are dropped in the order of declaration.
    context: Context,
}
Run

Implementations

impl<T> ManuallyDrop<T>[src]

#[must_use = "if you don't need the wrapper, you can use `mem::forget` instead"]pub const fn new(value: T) -> ManuallyDrop<T>[src]

Wrap a value to be manually dropped.

Examples

use std::mem::ManuallyDrop;
let mut x = ManuallyDrop::new(String::from("Hello World!"));
x.truncate(5); // You can still safely operate on the value
assert_eq!(*x, "Hello");
// But `Drop` will not be run here
Run

pub const fn into_inner(slot: ManuallyDrop<T>) -> T[src]

Extracts the value from the ManuallyDrop container.

This allows the value to be dropped again.

Examples

use std::mem::ManuallyDrop;
let x = ManuallyDrop::new(Box::new(()));
let _: Box<()> = ManuallyDrop::into_inner(x); // This drops the `Box`.
Run

#[must_use = "if you don't need the value, you can use `ManuallyDrop::drop` instead"]pub unsafe fn take(slot: &mut ManuallyDrop<T>) -> T1.42.0[src]

Takes the value from the ManuallyDrop<T> container out.

This method is primarily intended for moving out values in drop. Instead of using ManuallyDrop::drop to manually drop the value, you can use this method to take the value and use it however desired.

Whenever possible, it is preferable to use into_inner instead, which prevents duplicating the content of the ManuallyDrop<T>.

Safety

This function semantically moves out the contained value without preventing further usage, leaving the state of this container unchanged. It is your responsibility to ensure that this ManuallyDrop is not used again.

impl<T: ?Sized> ManuallyDrop<T>[src]

pub unsafe fn drop(slot: &mut ManuallyDrop<T>)[src]

Manually drops the contained value. This is exactly equivalent to calling ptr::drop_in_place with a pointer to the contained value. As such, unless the contained value is a packed struct, the destructor will be called in-place without moving the value, and thus can be used to safely drop pinned data.

If you have ownership of the value, you can use ManuallyDrop::into_inner instead.

Safety

This function runs the destructor of the contained value. Other than changes made by the destructor itself, the memory is left unchanged, and so as far as the compiler is concerned still holds a bit-pattern which is valid for the type T.

However, this "zombie" value should not be exposed to safe code, and this function should not be called more than once. To use a value after it's been dropped, or drop a value multiple times, can cause Undefined Behavior (depending on what drop does). This is normally prevented by the type system, but users of ManuallyDrop must uphold those guarantees without assistance from the compiler.

Trait Implementations

impl<T: Clone + ?Sized> Clone for ManuallyDrop<T>[src]

impl<T: Copy + ?Sized> Copy for ManuallyDrop<T>[src]

impl<T: Debug + ?Sized> Debug for ManuallyDrop<T>[src]

impl<T: Default + ?Sized> Default for ManuallyDrop<T>[src]

impl<T: ?Sized> Deref for ManuallyDrop<T>[src]

type Target = T

The resulting type after dereferencing.

impl<T: ?Sized> DerefMut for ManuallyDrop<T>[src]

impl<T: Eq + ?Sized> Eq for ManuallyDrop<T>[src]

impl<T: Hash + ?Sized> Hash for ManuallyDrop<T>[src]

impl<T: Ord + ?Sized> Ord for ManuallyDrop<T>[src]

impl<T: PartialEq + ?Sized> PartialEq<ManuallyDrop<T>> for ManuallyDrop<T>[src]

impl<T: PartialOrd + ?Sized> PartialOrd<ManuallyDrop<T>> for ManuallyDrop<T>[src]

impl<T: ?Sized> StructuralEq for ManuallyDrop<T>[src]

impl<T: ?Sized> StructuralPartialEq for ManuallyDrop<T>[src]

Auto Trait Implementations

impl<T: ?Sized> Send for ManuallyDrop<T> where
    T: Send

impl<T: ?Sized> Sync for ManuallyDrop<T> where
    T: Sync

impl<T: ?Sized> Unpin for ManuallyDrop<T> where
    T: Unpin

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.