Struct std::boxed::ThinBox

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pub struct ThinBox<T> where
  T: ?Sized, { /* private fields */ }

🔬 This is a nightly-only experimental API. (thin_box #92791)

Expand description

ThinBox.

A thin pointer for heap allocation, regardless of T.

Examples

#![feature(thin_box)]
use std::boxed::ThinBox;
let five = ThinBox::new(5);
let thin_slice = ThinBox::<[i32]>::new_unsize([1, 2, 3, 4]);
use std::mem::{size_of, size_of_val};
let size_of_ptr = size_of::<*const ()>();
assert_eq!(size_of_ptr, size_of_val(&five));
assert_eq!(size_of_ptr, size_of_val(&thin_slice));

Run

Implementations

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impl<T> ThinBox<T>

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pub fn new(value: T) -> ThinBox<T>

🔬 This is a nightly-only experimental API. (thin_box #92791)

Moves a type to the heap with its Metadata stored in the heap allocation instead of on the stack.

Examples

#![feature(thin_box)]
use std::boxed::ThinBox;
let five = ThinBox::new(5);

Run

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impl<Dyn> ThinBox<Dyn> where
Dyn: ?Sized,

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pub fn new_unsize<T>(value: T) -> ThinBox<Dyn> where
T: Unsize<Dyn>,

🔬 This is a nightly-only experimental API. (thin_box #92791)

Moves a type to the heap with its Metadata stored in the heap allocation instead of on the stack.

Examples

#![feature(thin_box)]
use std::boxed::ThinBox;
let thin_slice = ThinBox::<[i32]>::new_unsize([1, 2, 3, 4]);

Run

Trait Implementations

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impl<T> Debug for ThinBox<T> where
T: Debug + ?Sized,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

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impl<T> Deref for ThinBox<T> where
T: ?Sized,

type Target = T

The resulting type after dereferencing.

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fn deref(&self) -> &T

Dereferences the value.

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impl<T> DerefMut for ThinBox<T> where
T: ?Sized,

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fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

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impl<T> Display for ThinBox<T> where
T: Display + ?Sized,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

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impl<T> Drop for ThinBox<T> where
T: ?Sized,

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fn drop(&mut self)

Executes the destructor for this type. Read more

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impl<T: ?Sized + Error> Error for ThinBox<T>

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fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more

1.0.0 · source

fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more

1.0.0 · source

fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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fn provide<'a>(&'a self, req: &mut Demand<'a>)

🔬 This is a nightly-only experimental API. (error_generic_member_access #99301)

Provides type based access to context intended for error reports. Read more

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impl<T> Send for ThinBox<T> where
T: Send + ?Sized,

ThinBox<T> is Send if T is Send because the data is owned.

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impl<T> Sync for ThinBox<T> where
T: Sync + ?Sized,

ThinBox<T> is Sync if T is Sync because the data is owned.