Struct alloc::boxed::Box

pub struct Box<T: ?Sized>(_);

A pointer type for heap allocation.

See the module-level documentation for more.

Methods

impl<T> Box<T>

fn new(x: T) -> Box<T>

Allocates memory on the heap and then moves x`x` into it.

Examples

let x = Box::new(5);

impl<T: ?Sized> Box<T>

unsafe fn from_raw(raw: *mut T) -> Self

Unstable

: may be renamed or moved out of Box scope

Constructs a box from the raw pointer.

After this function call, pointer is owned by resulting box. In particular, it means that Box`Boxdestructor calls destructor ofTand releases memory. Since the wayBoxallocates and releases memory is unspecified, the only valid pointer to pass to this function is the one taken from anotherBoxwith` with Box::into_raw function.

Function is unsafe, because improper use of this function may lead to memory problems like double-free, for example if the function is called twice on the same raw pointer.

fn into_raw(b: Box<T>) -> *mut T

Unstable

: may be renamed

Consumes the Box`Box`, returning the wrapped raw pointer.

After call to this function, caller is responsible for the memory previously managed by Box`Box, in particular caller should properly destroyTand release memory. The proper way to do it is to convert pointer back toBoxwith` with Box::from_raw function, because Box`Box` does not specify, how memory is allocated.

Examples

#![feature(box_raw)]

let seventeen = Box::new(17u32);
let raw = Box::into_raw(seventeen);
let boxed_again = unsafe { Box::from_raw(raw) };

impl Box<Any>

fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>>

Attempt to downcast the box to a concrete type.

impl Box<Any + Send>

fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any + Send>>

Attempt to downcast the box to a concrete type.

Trait Implementations

impl<T> Boxed for Box<T>

type Data = T

type Place = IntermediateBox<T>

unsafe fn finalize(b: IntermediateBox<T>) -> Box<T>

impl<T: Default> Default for Box<T>

fn default() -> Box<T>

impl<T> Default for Box<[T]>

fn default() -> Box<[T]>

impl<T: Clone> Clone for Box<T>

fn clone(&self) -> Box<T>

fn clone_from(&mut self, source: &Box<T>)

impl Clone for Box<str>

fn clone(&self) -> Self

fn clone_from(&mut self, source: &Self)

impl<T: ?Sized + PartialEq> PartialEq for Box<T>

fn eq(&self, other: &Box<T>) -> bool

fn ne(&self, other: &Box<T>) -> bool

impl<T: ?Sized + PartialOrd> PartialOrd for Box<T>

fn partial_cmp(&self, other: &Box<T>) -> Option<Ordering>

fn lt(&self, other: &Box<T>) -> bool

fn le(&self, other: &Box<T>) -> bool

fn ge(&self, other: &Box<T>) -> bool

fn gt(&self, other: &Box<T>) -> bool

impl<T: ?Sized + Ord> Ord for Box<T>

fn cmp(&self, other: &Box<T>) -> Ordering

impl<T: ?Sized + Eq> Eq for Box<T>

impl<T: ?Sized + Hash> Hash for Box<T>

fn hash<H: Hasher>(&self, state: &mut H)

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher

impl<T: Display + ?Sized> Display for Box<T>

fn fmt(&self, f: &mut Formatter) -> Result

impl<T: Debug + ?Sized> Debug for Box<T>

fn fmt(&self, f: &mut Formatter) -> Result

impl<T> Pointer for Box<T>

fn fmt(&self, f: &mut Formatter) -> Result

impl<T: ?Sized> Deref for Box<T>

type Target = T

fn deref(&self) -> &T

impl<T: ?Sized> DerefMut for Box<T>

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

impl<I: Iterator + ?Sized> Iterator for Box<I>

type Item = I::Item

fn next(&mut self) -> Option<I::Item>

fn size_hint(&self) -> (usize, Option<usize>)

fn count(self) -> usize

fn last(self) -> Option<Self::Item>

fn nth(&mut self, n: usize) -> Option<Self::Item>

fn chain<U>(self, other: U) -> Chain<Self, U::IntoIter> where U: IntoIterator<Item=Self::Item>

fn zip<U>(self, other: U) -> Zip<Self, U::IntoIter> where U: IntoIterator

fn map<B, F>(self, f: F) -> Map<Self, F> where F: FnMut(Self::Item) -> B

fn filter<P>(self, predicate: P) -> Filter<Self, P> where P: FnMut(&Self::Item) -> bool

fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> where F: FnMut(Self::Item) -> Option<B>

fn enumerate(self) -> Enumerate<Self>

fn peekable(self) -> Peekable<Self>

fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where P: FnMut(&Self::Item) -> bool

fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where P: FnMut(&Self::Item) -> bool

fn skip(self, n: usize) -> Skip<Self>

fn take(self, n: usize) -> Take<Self>

fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where F: FnMut(&mut St, Self::Item) -> Option<B>

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where F: FnMut(Self::Item) -> U, U: IntoIterator

fn fuse(self) -> Fuse<Self>

fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnMut(&Self::Item) -> ()

fn by_ref(&mut self) -> &mut Self

fn collect<B>(self) -> B where B: FromIterator<Self::Item>

fn partition<B, F>(self, f: F) -> (B, B) where F: FnMut(&Self::Item) -> bool, B: Default + Extend<Self::Item>

fn fold<B, F>(self, init: B, f: F) -> B where F: FnMut(B, Self::Item) -> B

fn all<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool

fn any<F>(&mut self, f: F) -> bool where F: FnMut(Self::Item) -> bool

fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where P: FnMut(&Self::Item) -> bool

fn position<P>(&mut self, predicate: P) -> Option<usize> where P: FnMut(Self::Item) -> bool

fn rposition<P>(&mut self, predicate: P) -> Option<usize> where Self: ExactSizeIterator + DoubleEndedIterator, P: FnMut(Self::Item) -> bool

fn max(self) -> Option<Self::Item> where Self::Item: Ord

fn min(self) -> Option<Self::Item> where Self::Item: Ord

fn min_max(self) -> MinMaxResult<Self::Item> where Self::Item: Ord

fn max_by<B, F>(self, f: F) -> Option<Self::Item> where F: FnMut(&Self::Item) -> B, B: Ord

fn min_by<B, F>(self, f: F) -> Option<Self::Item> where B: Ord, F: FnMut(&Self::Item) -> B

fn rev(self) -> Rev<Self> where Self: DoubleEndedIterator

fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where FromA: Default + Extend<A>, Self: Iterator<Item=(A, B)>, FromB: Default + Extend<B>

fn cloned<'a, T>(self) -> Cloned<Self> where Self: Iterator<Item=&'a T>, T: 'a + Clone

fn cycle(self) -> Cycle<Self> where Self: Clone

fn reverse_in_place<'a, T>(&mut self) where Self: Iterator<Item=&'a mut T> + DoubleEndedIterator, T: 'a

fn sum<S = Self::Item>(self) -> S where S: Add<Self::Item, Output=S> + Zero

fn product<P = Self::Item>(self) -> P where P: Mul<Self::Item, Output=P> + One

impl<I: DoubleEndedIterator + ?Sized> DoubleEndedIterator for Box<I>

fn next_back(&mut self) -> Option<I::Item>

impl<I: ExactSizeIterator + ?Sized> ExactSizeIterator for Box<I>

fn len(&self) -> usize

impl<'a, A, R> FnOnce<A> for Box<FnBox<A, Output=R> + 'a>

type Output = R

extern "rust-call" fn call_once(self, args: A) -> R

impl<'a, A, R> FnOnce<A> for Box<FnBox<A, Output=R> + Send + 'a>

type Output = R

extern "rust-call" fn call_once(self, args: A) -> R

impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T>

impl<T: Clone> Clone for Box<[T]>

fn clone(&self) -> Self

fn clone_from(&mut self, source: &Self)