Struct allocator_api::boxed::Box
source · Implementations§
source§impl<T: ?Sized> Box<T>
impl<T: ?Sized> Box<T>
sourcepub unsafe fn from_raw(raw: *mut T) -> Self
pub unsafe fn from_raw(raw: *mut T) -> Self
Constructs a box from a raw pointer.
After calling this function, the raw pointer is owned by the
resulting Box
. Specifically, the Box
destructor will call
the destructor of T
and free the allocated memory. Since the
way Box
allocates and releases memory is unspecified, the
only valid pointer to pass to this function is the one taken
from another Box
via the Box::into_raw
function.
This function is unsafe because improper use may lead to memory problems. For example, a double-free may occur if the function is called twice on the same raw pointer.
Examples
extern crate allocator_api;
use allocator_api::Box;
let x = Box::new(5);
let ptr = Box::into_raw(x);
let x = unsafe { Box::from_raw(ptr) };
source§impl<T: ?Sized, A: Alloc> Box<T, A>
impl<T: ?Sized, A: Alloc> Box<T, A>
sourcepub unsafe fn from_raw_in(raw: *mut T, a: A) -> Self
pub unsafe fn from_raw_in(raw: *mut T, a: A) -> Self
Constructs a box from a raw pointer in the given allocator.
This is similar to the Box::from_raw
function, but assumes
the pointer was allocated with the given allocator.
This function is unsafe because improper use may lead to memory problems. For example, specifying the wrong allocator may corrupt the allocator state.
Examples
extern crate allocator_api;
use allocator_api::{Box, Global};
let x = Box::new_in(5, Global);
let ptr = Box::into_raw(x);
let x = unsafe { Box::from_raw_in(ptr, Global) };
sourcepub fn into_raw(b: Box<T, A>) -> *mut T
pub fn into_raw(b: Box<T, A>) -> *mut T
Consumes the Box
, returning the wrapped raw pointer.
After calling this function, the caller is responsible for the
memory previously managed by the Box
. In particular, the
caller should properly destroy T
and release the memory. The
proper way to do so is to convert the raw pointer back into a
Box
with the Box::from_raw
or the Box::from_raw_in
functions, with the appropriate allocator.
Note: this is an associated function, which means that you have
to call it as Box::into_raw(b)
instead of b.into_raw()
. This
is so that there is no conflict with a method on the inner type.
Examples
extern crate allocator_api;
use allocator_api::Box;
let x = Box::new(5);
let ptr = Box::into_raw(x);
sourcepub fn leak<'a>(b: Box<T, A>) -> &'a mut Twhere
T: 'a,
pub fn leak<'a>(b: Box<T, A>) -> &'a mut Twhere
T: 'a,
Consumes and leaks the Box
, returning a mutable reference,
&'a mut T
. Here, the lifetime 'a
may be chosen to be 'static
.
This function is mainly useful for data that lives for the remainder of
the program’s life. Dropping the returned reference will cause a memory
leak. If this is not acceptable, the reference should first be wrapped
with the Box::from_raw
function producing a Box
. This Box
can
then be dropped which will properly destroy T
and release the
allocated memory.
Note: this is an associated function, which means that you have
to call it as Box::leak(b)
instead of b.leak()
. This
is so that there is no conflict with a method on the inner type.
Examples
Simple usage:
extern crate allocator_api;
use allocator_api::Box;
fn main() {
let x = Box::new(41);
let static_ref: &'static mut usize = Box::leak(x);
*static_ref += 1;
assert_eq!(*static_ref, 42);
}
Unsized data:
extern crate allocator_api;
use allocator_api::{Box, RawVec};
struct MyVec<T> {
buf: RawVec<T>,
len: usize,
}
impl<T> MyVec<T> {
pub fn push(&mut self, elem: T) {
if self.len == self.buf.cap() { self.buf.double(); }
// double would have aborted or panicked if the len exceeded
// `isize::MAX` so this is safe to do unchecked now.
unsafe {
ptr::write(self.buf.ptr().offset(self.len as isize), elem);
}
self.len += 1;
}
}
fn main() {
//let x = vec![1, 2, 3].into_boxed_slice();
let mut v = MyVec { buf: RawVec::new(), len: 0 };
v.push(1);
v.push(2);
v.push(3);
v.buf.shrink_to_fit(v.len);
let x = unsafe { v.buf.into_box() };
let static_ref = Box::leak(x);
static_ref[0] = 4;
assert_eq!(*static_ref, [4, 2, 3]);
}
Trait Implementations§
source§impl<T: ?Sized, A: Alloc> BorrowMut<T> for Box<T, A>
impl<T: ?Sized, A: Alloc> BorrowMut<T> for Box<T, A>
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T: Clone, A: Alloc + Clone> Clone for Box<T, A>
impl<T: Clone, A: Alloc + Clone> Clone for Box<T, A>
source§fn clone(&self) -> Box<T, A> ⓘ
fn clone(&self) -> Box<T, A> ⓘ
Returns a new box with a clone()
of this box’s contents.
Examples
extern crate allocator_api;
use allocator_api::Box;
let x = Box::new(5);
let y = x.clone();
source§fn clone_from(&mut self, source: &Box<T, A>)
fn clone_from(&mut self, source: &Box<T, A>)
Copies source
’s contents into self
without creating a new allocation.
Examples
extern crate allocator_api;
use allocator_api::Box;
let x = Box::new(5);
let mut y = Box::new(10);
y.clone_from(&x);
assert_eq!(*y, 5);
source§impl<I: DoubleEndedIterator + ?Sized, A: Alloc> DoubleEndedIterator for Box<I, A>
impl<I: DoubleEndedIterator + ?Sized, A: Alloc> DoubleEndedIterator for Box<I, A>
source§fn next_back(&mut self) -> Option<I::Item>
fn next_back(&mut self) -> Option<I::Item>
source§fn advance_back_by(&mut self, n: usize) -> Result<(), usize>
fn advance_back_by(&mut self, n: usize) -> Result<(), usize>
iter_advance_by
)n
elements. Read more1.37.0 · source§fn nth_back(&mut self, n: usize) -> Option<Self::Item>
fn nth_back(&mut self, n: usize) -> Option<Self::Item>
n
th element from the end of the iterator. Read more1.27.0 · source§fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
Iterator::try_fold()
: it takes
elements starting from the back of the iterator. Read moresource§impl<I: ExactSizeIterator + ?Sized, A: Alloc> ExactSizeIterator for Box<I, A>
impl<I: ExactSizeIterator + ?Sized, A: Alloc> ExactSizeIterator for Box<I, A>
source§impl<T: ?Sized + Hasher, A: Alloc> Hasher for Box<T, A>
impl<T: ?Sized + Hasher, A: Alloc> Hasher for Box<T, A>
source§fn write_u128(&mut self, i: u128)
fn write_u128(&mut self, i: u128)
u128
into this hasher.source§fn write_usize(&mut self, i: usize)
fn write_usize(&mut self, i: usize)
usize
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fn write_i128(&mut self, i: i128)
i128
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fn write_isize(&mut self, i: isize)
isize
into this hasher.source§fn write_length_prefix(&mut self, len: usize)
fn write_length_prefix(&mut self, len: usize)
hasher_prefixfree_extras
)source§impl<I: Iterator + ?Sized, A: Alloc> Iterator for Box<I, A>
impl<I: Iterator + ?Sized, A: Alloc> Iterator for Box<I, A>
source§fn next(&mut self) -> Option<I::Item>
fn next(&mut self) -> Option<I::Item>
source§fn size_hint(&self) -> (usize, Option<usize>)
fn size_hint(&self) -> (usize, Option<usize>)
source§fn nth(&mut self, n: usize) -> Option<I::Item>
fn nth(&mut self, n: usize) -> Option<I::Item>
n
th element of the iterator. Read moresource§fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
iter_next_chunk
)N
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Self: Sized,
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iter_advance_by
)n
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Self: Sized,
1.0.0 · source§fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>where
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U: IntoIterator<Item = Self::Item>,
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U: IntoIterator,
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>where
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source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where
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fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where
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)separator
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Self: Sized,
F: FnMut(Self::Item) -> B,
fn map<B, F>(self, f: F) -> Map<Self, F>where
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F: FnMut(Self::Item) -> B,
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F: FnMut(Self::Item) -> Option<B>,
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F: FnMut(Self::Item) -> Option<B>,
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Self: Sized,
fn enumerate(self) -> Enumerate<Self>where
Self: Sized,
1.0.0 · source§fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
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Self: Sized,
P: FnMut(&Self::Item) -> bool,
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>where
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P: FnMut(&Self::Item) -> bool,
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P: FnMut(Self::Item) -> Option<B>,
fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P>where
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P: FnMut(Self::Item) -> Option<B>,
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fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,
n
elements. Read more1.0.0 · source§fn take(self, n: usize) -> Take<Self>where
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fn take(self, n: usize) -> Take<Self>where
Self: Sized,
n
elements, or fewer
if the underlying iterator ends sooner. Read more1.0.0 · source§fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>where
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>where
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
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Self: Sized,
U: IntoIterator,
F: FnMut(Self::Item) -> U,
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>where
Self: Sized,
U: IntoIterator,
F: FnMut(Self::Item) -> U,
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Self: Sized,
F: FnMut(&Self::Item),
fn inspect<F>(self, f: F) -> Inspect<Self, F>where
Self: Sized,
F: FnMut(&Self::Item),
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B: FromIterator<Self::Item>,
Self: Sized,
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Self: Sized,
source§fn collect_into<E>(self, collection: &mut E) -> &mut Ewhere
E: Extend<Self::Item>,
Self: Sized,
fn collect_into<E>(self, collection: &mut E) -> &mut Ewhere
E: Extend<Self::Item>,
Self: Sized,
iter_collect_into
)1.0.0 · source§fn partition<B, F>(self, f: F) -> (B, B)where
Self: Sized,
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
fn partition<B, F>(self, f: F) -> (B, B)where
Self: Sized,
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
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P: FnMut(Self::Item) -> bool,
fn is_partitioned<P>(self, predicate: P) -> boolwhere
Self: Sized,
P: FnMut(Self::Item) -> bool,
iter_is_partitioned
)true
precede all those that return false
. Read more1.27.0 · source§fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
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Self: Sized,
F: FnMut(Self::Item) -> R,
R: Try<Output = ()>,
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Self: Sized,
F: FnMut(Self::Item) -> R,
R: Try<Output = ()>,
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Self: Sized,
F: FnMut(B, Self::Item) -> B,
fn fold<B, F>(self, init: B, f: F) -> Bwhere
Self: Sized,
F: FnMut(B, Self::Item) -> B,
1.51.0 · source§fn reduce<F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
fn reduce<F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
source§fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
<R as Try>::Residual: Residual<Option<Self::Item>>,
fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
<R as Try>::Residual: Residual<Option<Self::Item>>,
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)1.0.0 · source§fn all<F>(&mut self, f: F) -> boolwhere
Self: Sized,
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Self: Sized,
F: FnMut(Self::Item) -> bool,
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F: FnMut(Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
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P: FnMut(&Self::Item) -> bool,
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F: FnMut(Self::Item) -> Option<B>,
fn find_map<B, F>(&mut self, f: F) -> Option<B>where
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F: FnMut(Self::Item) -> Option<B>,
source§fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
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F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
<R as Try>::Residual: Residual<Option<Self::Item>>,
fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
Self: Sized,
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R: Try<Output = bool>,
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)1.0.0 · source§fn position<P>(&mut self, predicate: P) -> Option<usize>where
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P: FnMut(Self::Item) -> bool,
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F: FnMut(&Self::Item) -> B,
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B: Ord,
Self: Sized,
F: FnMut(&Self::Item) -> B,
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Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn max_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
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B: Ord,
Self: Sized,
F: FnMut(&Self::Item) -> B,
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item>where
B: Ord,
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F: FnMut(&Self::Item) -> B,
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F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn min_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
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FromB: Default + Extend<B>,
Self: Sized + Iterator<Item = (A, B)>,
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Sized + Iterator<Item = (A, B)>,
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fn copied<'a, T>(self) -> Copied<Self>where
T: 'a + Copy,
Self: Sized + Iterator<Item = &'a T>,
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source§fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N>where
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fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N>where
Self: Sized,
iter_array_chunks
)N
elements of the iterator at a time. Read more1.11.0 · source§fn sum<S>(self) -> Swhere
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Self: Sized,
P: Product<Self::Item>,
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P: Product<Self::Item>,
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I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Ordering,
fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere
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I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Ordering,
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)Iterator
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I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
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source§fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
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fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
iter_order_by
)Iterator
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Self::Item: PartialEq<<I as IntoIterator>::Item>,
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)1.5.0 · source§fn ne<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
Self: Sized,
fn ne<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,
Self: Sized,
1.5.0 · source§fn lt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
fn lt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
Iterator
are lexicographically
less than those of another. Read more1.5.0 · source§fn le<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
fn le<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
Iterator
are lexicographically
less or equal to those of another. Read more1.5.0 · source§fn gt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
fn gt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
Iterator
are lexicographically
greater than those of another. Read more1.5.0 · source§fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
Iterator
are lexicographically
greater than or equal to those of another. Read moresource§fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
is_sorted
)source§fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,
fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,
is_sorted
)source§impl<T: ?Sized + Ord, A: Alloc> Ord for Box<T, A>
impl<T: ?Sized + Ord, A: Alloc> Ord for Box<T, A>
source§impl<T: ?Sized + PartialEq, A: Alloc> PartialEq<Box<T, A>> for Box<T, A>
impl<T: ?Sized + PartialEq, A: Alloc> PartialEq<Box<T, A>> for Box<T, A>
source§impl<T: ?Sized + PartialOrd, A: Alloc> PartialOrd<Box<T, A>> for Box<T, A>
impl<T: ?Sized + PartialOrd, A: Alloc> PartialOrd<Box<T, A>> for Box<T, A>
source§fn le(&self, other: &Box<T, A>) -> bool
fn le(&self, other: &Box<T, A>) -> bool
self
and other
) and is used by the <=
operator. Read more