1.0.0[−][src]Struct alloc::boxed::Box
A pointer type for heap allocation.
See the module-level documentation for more.
Methods
impl<T> Box<T>
[src]
impl<T> Box<T>
ⓘImportant traits for Box<W>
pub fn new(x: T) -> Box<T> | [src] |
Allocates memory on the heap and then places x
into it.
This doesn't actually allocate if T
is zero-sized.
Examples
let five = Box::new(5);
pub fn pin(x: T) -> Pin<Box<T>> | 1.33.0 [src] |
Constructs a new Pin<Box<T>>
. If T
does not implement Unpin
, then
x
will be pinned in memory and unable to be moved.
impl<T> Box<T> where
T: ?Sized,
[src]
impl<T> Box<T> where
T: ?Sized,
ⓘImportant traits for Box<W>
pub unsafe fn from_raw(raw: *mut T) -> Box<T> | 1.4.0 [src] |
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
let x = Box::new(5); let ptr = Box::into_raw(x); let x = unsafe { Box::from_raw(ptr) };
pub fn into_raw(b: Box<T>) -> *mut T | 1.4.0 [src] |
Consumes the Box
, returning a wrapped raw pointer.
The pointer will be properly aligned and non-null.
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
function.
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
let x = Box::new(5); let ptr = Box::into_raw(x);
pub fn into_raw_non_null(b: Box<T>) -> NonNull<T> | [src] |
box_into_raw_non_null
)Consumes the Box
, returning the wrapped pointer as NonNull<T>
.
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 NonNull<T>
pointer
into a raw pointer and back into a Box
with the Box::from_raw
function.
Note: this is an associated function, which means that you have
to call it as Box::into_raw_non_null(b)
instead of b.into_raw_non_null()
. This
is so that there is no conflict with a method on the inner type.
Examples
#![feature(box_into_raw_non_null)] fn main() { let x = Box::new(5); let ptr = Box::into_raw_non_null(x); }
pub fn leak<'a>(b: Box<T>) -> &'a mut T where | 1.26.0 [src] |
Consumes and leaks the Box
, returning a mutable reference,
&'a mut T
. Note that the type T
must outlive the chosen lifetime
'a
. If the type has only static references, or none at all, then this
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:
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:
fn main() { let x = vec![1, 2, 3].into_boxed_slice(); let static_ref = Box::leak(x); static_ref[0] = 4; assert_eq!(*static_ref, [4, 2, 3]); }
pub fn into_pin(boxed: Box<T>) -> Pin<Box<T>> | [src] |
box_into_pin
)Converts a Box<T>
into a Pin<Box<T>>
This conversion does not allocate on the heap and happens in place.
This is also available via From
.
impl Box<dyn Any + 'static>
[src]
impl Box<dyn Any + 'static>
pub fn downcast<T>(self) -> Result<Box<T>, Box<dyn Any + 'static>> where | [src] |
Attempt to downcast the box to a concrete type.
Examples
use std::any::Any; fn print_if_string(value: Box<dyn Any>) { if let Ok(string) = value.downcast::<String>() { println!("String ({}): {}", string.len(), string); } } fn main() { let my_string = "Hello World".to_string(); print_if_string(Box::new(my_string)); print_if_string(Box::new(0i8)); }
impl Box<dyn Any + 'static + Send>
[src]
impl Box<dyn Any + 'static + Send>
pub fn downcast<T>(self) -> Result<Box<T>, Box<dyn Any + 'static + Send>> where | [src] |
Attempt to downcast the box to a concrete type.
Examples
use std::any::Any; fn print_if_string(value: Box<dyn Any + Send>) { if let Ok(string) = value.downcast::<String>() { println!("String ({}): {}", string.len(), string); } } fn main() { let my_string = "Hello World".to_string(); print_if_string(Box::new(my_string)); print_if_string(Box::new(0i8)); }
Trait Implementations
impl Clone for Box<Path>
1.29.0[src]
impl Clone for Box<Path>
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<Path> | [src] |
fn clone_from(&mut self, source: &Self) | [src] |
Performs copy-assignment from source
. Read more
impl Clone for Box<CStr>
1.29.0[src]
impl Clone for Box<CStr>
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<CStr> | [src] |
fn clone_from(&mut self, source: &Self) | [src] |
Performs copy-assignment from source
. Read more
impl Clone for Box<OsStr>
1.29.0[src]
impl Clone for Box<OsStr>
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<OsStr> | [src] |
fn clone_from(&mut self, source: &Self) | [src] |
Performs copy-assignment from source
. Read more
impl<T> Error for Box<T> where
T: Error,
1.8.0[src]
impl<T> Error for Box<T> where
T: Error,
fn description(&self) -> &str | [src] |
fn cause(&self) -> Option<&dyn Error> | [src] |
fn source(&self) -> Option<&(dyn Error + 'static)> | 1.30.0 [src] |
The lower-level source of this error, if any. Read more
impl<B> BufRead for Box<B> where
B: BufRead + ?Sized,
[src]
impl<B> BufRead for Box<B> where
B: BufRead + ?Sized,
fn fill_buf(&mut self) -> Result<&[u8], Error> | [src] |
fn consume(&mut self, amt: usize) | [src] |
fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> Result<usize, Error> | [src] |
fn read_line(&mut self, buf: &mut String) -> Result<usize, Error> | [src] |
fn split(self, byte: u8) -> Split<Self> | [src] |
Returns an iterator over the contents of this reader split on the byte byte
. Read more
fn lines(self) -> Lines<Self> | [src] |
Returns an iterator over the lines of this reader. Read more
impl<S> Seek for Box<S> where
S: Seek + ?Sized,
[src]
impl<S> Seek for Box<S> where
S: Seek + ?Sized,
impl<W> Write for Box<W> where
W: Write + ?Sized,
[src]
impl<W> Write for Box<W> where
W: Write + ?Sized,
fn write(&mut self, buf: &[u8]) -> Result<usize, Error> | [src] |
fn flush(&mut self) -> Result<(), Error> | [src] |
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error> | [src] |
fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error> | [src] |
fn by_ref(&mut self) -> &mut Self | [src] |
Creates a "by reference" adaptor for this instance of Write
. Read more
impl<R> Read for Box<R> where
R: Read + ?Sized,
[src]
impl<R> Read for Box<R> where
R: Read + ?Sized,
fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error> | [src] |
unsafe fn initializer(&self) -> Initializer | [src] |
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error> | [src] |
fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error> | [src] |
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error> | [src] |
fn by_ref(&mut self) -> &mut Self | [src] |
Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self> | [src] |
Transforms this Read
instance to an [Iterator
] over its bytes. Read more
fn chain<R>(self, next: R) -> Chain<Self, R> where | [src] |
Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self> | [src] |
Creates an adaptor which will read at most limit
bytes from it. Read more
impl Default for Box<OsStr>
1.17.0[src]
impl Default for Box<OsStr>
impl Default for Box<CStr>
1.17.0[src]
impl Default for Box<CStr>
impl From<OsString> for Box<OsStr>
1.20.0[src]
impl From<OsString> for Box<OsStr>
impl<'a, 'b> From<&'b str> for Box<dyn Error + 'a + Send + Sync>
[src]
impl<'a, 'b> From<&'b str> for Box<dyn Error + 'a + Send + Sync>
impl From<String> for Box<dyn Error + 'static>
1.6.0[src]
impl From<String> for Box<dyn Error + 'static>
impl<'a> From<&'a OsStr> for Box<OsStr>
1.17.0[src]
impl<'a> From<&'a OsStr> for Box<OsStr>
impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static>
1.22.0[src]
impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static>
ⓘImportant traits for Box<W>
fn from(err: Cow<'a, str>) -> Box<dyn Error + 'static> | [src] |
Converts a [Cow
] into a box of dyn [Error
].
Examples
use std::error::Error; use std::mem; use std::borrow::Cow; let a_cow_str_error = Cow::from("a str error"); let a_boxed_error = Box::<Error>::from(a_cow_str_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))
impl From<PathBuf> for Box<Path>
1.20.0[src]
impl From<PathBuf> for Box<Path>
ⓘImportant traits for Box<W>
fn from(p: PathBuf) -> Box<Path> | [src] |
Converts a PathBuf
into a Box<Path>
This conversion currently should not allocate memory, but this behavior is not guaranteed on all platforms or in all future versions.
impl<'a> From<&'a Path> for Box<Path>
1.17.0[src]
impl<'a> From<&'a Path> for Box<Path>
impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + 'a + Send + Sync>
1.22.0[src]
impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + 'a + Send + Sync>
ⓘImportant traits for Box<W>
fn from(err: Cow<'b, str>) -> Box<dyn Error + 'a + Send + Sync> | [src] |
Converts a [Cow
] into a box of dyn [Error
] + Send
+ Sync
.
Examples
use std::error::Error; use std::mem; use std::borrow::Cow; let a_cow_str_error = Cow::from("a str error"); let a_boxed_error = Box::<Error + Send + Sync>::from(a_cow_str_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl From<CString> for Box<CStr>
1.20.0[src]
impl From<CString> for Box<CStr>
impl From<String> for Box<dyn Error + 'static + Send + Sync>
[src]
impl From<String> for Box<dyn Error + 'static + Send + Sync>
ⓘImportant traits for Box<W>
fn from(err: String) -> Box<dyn Error + 'static + Send + Sync> | [src] |
Converts a String
into a box of dyn [Error
] + Send
+ Sync
.
Examples
use std::error::Error; use std::mem; let a_string_error = "a string error".to_string(); let a_boxed_error = Box::<Error + Send + Sync>::from(a_string_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl<'a, E> From<E> for Box<dyn Error + 'a + Send + Sync> where
E: 'a + Error + Send + Sync,
[src]
impl<'a, E> From<E> for Box<dyn Error + 'a + Send + Sync> where
E: 'a + Error + Send + Sync,
ⓘImportant traits for Box<W>
fn from(err: E) -> Box<dyn Error + 'a + Send + Sync> | [src] |
Converts a type of [Error
] + Send
+ Sync
into a box of dyn [Error
] +
Send
+ Sync
.
Examples
use std::error::Error; use std::fmt; use std::mem; #[derive(Debug)] struct AnError; impl fmt::Display for AnError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f , "An error") } } impl Error for AnError { fn description(&self) -> &str { "Description of an error" } } unsafe impl Send for AnError {} unsafe impl Sync for AnError {} let an_error = AnError; assert!(0 == mem::size_of_val(&an_error)); let a_boxed_error = Box::<Error + Send + Sync>::from(an_error); assert!( mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))
impl<'a> From<&'a str> for Box<dyn Error + 'static>
1.6.0[src]
impl<'a> From<&'a str> for Box<dyn Error + 'static>
impl<'a> From<&'a CStr> for Box<CStr>
1.17.0[src]
impl<'a> From<&'a CStr> for Box<CStr>
impl<'a, E> From<E> for Box<dyn Error + 'a> where
E: 'a + Error,
[src]
impl<'a, E> From<E> for Box<dyn Error + 'a> where
E: 'a + Error,
ⓘImportant traits for Box<W>
fn from(err: E) -> Box<dyn Error + 'a> | [src] |
Converts a type of [Error
] into a box of dyn [Error
].
Examples
use std::error::Error; use std::fmt; use std::mem; #[derive(Debug)] struct AnError; impl fmt::Display for AnError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f , "An error") } } impl Error for AnError { fn description(&self) -> &str { "Description of an error" } } let an_error = AnError; assert!(0 == mem::size_of_val(&an_error)); let a_boxed_error = Box::<Error>::from(an_error); assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))
impl<T> AsMut<T> for Box<T> where
T: ?Sized,
1.5.0[src]
impl<T> AsMut<T> for Box<T> where
T: ?Sized,
impl<T> Pointer for Box<T> where
T: ?Sized,
[src]
impl<T> Pointer for Box<T> where
T: ?Sized,
impl<T, U> DispatchFromDyn<Box<U>> for Box<T> where
T: Unsize<U> + ?Sized,
U: ?Sized,
[src]
impl<T, U> DispatchFromDyn<Box<U>> for Box<T> where
T: Unsize<U> + ?Sized,
U: ?Sized,
impl<T> Eq for Box<T> where
T: Eq + ?Sized,
[src]
impl<T> Eq for Box<T> where
T: Eq + ?Sized,
impl<F> Future for Box<F> where
F: Unpin + Future + ?Sized,
[src]
impl<F> Future for Box<F> where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
The result of the Future
.
fn poll( | [src] |
impl Clone for Box<str>
1.3.0[src]
impl Clone for Box<str>
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<str> | [src] |
fn clone_from(&mut self, source: &Self) | [src] |
Performs copy-assignment from source
. Read more
impl<T> Clone for Box<T> where
T: Clone,
[src]
impl<T> Clone for Box<T> where
T: Clone,
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<T> | [src] |
Returns a new box with a clone()
of this box's contents.
Examples
let x = Box::new(5); let y = x.clone();
fn clone_from(&mut self, source: &Box<T>) | [src] |
Copies source
's contents into self
without creating a new allocation.
Examples
let x = Box::new(5); let mut y = Box::new(10); y.clone_from(&x); assert_eq!(*y, 5);
impl<T> Clone for Box<[T]> where
T: Clone,
1.3.0[src]
impl<T> Clone for Box<[T]> where
T: Clone,
ⓘImportant traits for Box<W>
fn clone(&self) -> Box<[T]> | [src] |
fn clone_from(&mut self, source: &Self) | [src] |
Performs copy-assignment from source
. Read more
impl<T> Hash for Box<T> where
T: Hash + ?Sized,
[src]
impl<T> Hash for Box<T> where
T: Hash + ?Sized,
fn hash<H>(&self, state: &mut H) where | [src] |
fn hash_slice<H>(data: &[Self], state: &mut H) where | 1.3.0 [src] |
Feeds a slice of this type into the given [Hasher
]. Read more
impl<T> DerefMut for Box<T> where
T: ?Sized,
[src]
impl<T> DerefMut for Box<T> where
T: ?Sized,
impl<T, U> CoerceUnsized<Box<U>> for Box<T> where
T: Unsize<U> + ?Sized,
U: ?Sized,
[src]
impl<T, U> CoerceUnsized<Box<U>> for Box<T> where
T: Unsize<U> + ?Sized,
U: ?Sized,
impl<T> PartialEq<Box<T>> for Box<T> where
T: PartialEq<T> + ?Sized,
[src]
impl<T> PartialEq<Box<T>> for Box<T> where
T: PartialEq<T> + ?Sized,
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + 'a>
[src]
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + 'a>
type Output = R
The returned type after the call operator is used.
extern "rust-call" fn call_once(self, args: A) -> R | [src] |
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + 'a + Send>
[src]
impl<'a, A, R> FnOnce<A> for Box<dyn FnBox<A, Output = R> + 'a + Send>
type Output = R
The returned type after the call operator is used.
extern "rust-call" fn call_once(self, args: A) -> R | [src] |
impl<T> BorrowMut<T> for Box<T> where
T: ?Sized,
1.1.0[src]
impl<T> BorrowMut<T> for Box<T> where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T | [src] |
impl<T> PartialOrd<Box<T>> for Box<T> where
T: PartialOrd<T> + ?Sized,
[src]
impl<T> PartialOrd<Box<T>> for Box<T> where
T: PartialOrd<T> + ?Sized,
fn partial_cmp(&self, other: &Box<T>) -> Option<Ordering> | [src] |
fn lt(&self, other: &Box<T>) -> bool | [src] |
fn le(&self, other: &Box<T>) -> bool | [src] |
fn ge(&self, other: &Box<T>) -> bool | [src] |
fn gt(&self, other: &Box<T>) -> bool | [src] |
impl<T> Deref for Box<T> where
T: ?Sized,
[src]
impl<T> Deref for Box<T> where
T: ?Sized,
impl<I> ExactSizeIterator for Box<I> where
I: ExactSizeIterator + ?Sized,
[src]
impl<I> ExactSizeIterator for Box<I> where
I: ExactSizeIterator + ?Sized,
impl<A> FromIterator<A> for Box<[A]>
1.32.0[src]
impl<A> FromIterator<A> for Box<[A]>
ⓘImportant traits for Box<W>
fn from_iter<T>(iter: T) -> Box<[A]> where | [src] |
impl<I> Iterator for Box<I> where
I: Iterator + ?Sized,
[src]
impl<I> Iterator for Box<I> where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item
The type of the elements being iterated over.
fn next(&mut self) -> Option<<I as Iterator>::Item> | [src] |
fn size_hint(&self) -> (usize, Option<usize>) | [src] |
fn nth(&mut self, n: usize) -> Option<<I as Iterator>::Item> | [src] |
fn count(self) -> usize | [src] |
Consumes the iterator, counting the number of iterations and returning it. Read more
fn last(self) -> Option<Self::Item> | [src] |
Consumes the iterator, returning the last element. Read more
fn step_by(self, step: usize) -> StepBy<Self> | 1.28.0 [src] |
Creates an iterator starting at the same point, but stepping by the given amount at each iteration. Read more
fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter> where | [src] |
Takes two iterators and creates a new iterator over both in sequence. Read more
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter> where | [src] |
'Zips up' two iterators into a single iterator of pairs. Read more
fn map<B, F>(self, f: F) -> Map<Self, F> where | [src] |
Takes a closure and creates an iterator which calls that closure on each element. Read more
fn for_each<F>(self, f: F) where | 1.21.0 [src] |
Calls a closure on each element of an iterator. Read more
fn filter<P>(self, predicate: P) -> Filter<Self, P> where | [src] |
Creates an iterator which uses a closure to determine if an element should be yielded. Read more
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> where | [src] |
Creates an iterator that both filters and maps. Read more
fn enumerate(self) -> Enumerate<Self> | [src] |
Creates an iterator which gives the current iteration count as well as the next value. Read more
fn peekable(self) -> Peekable<Self> | [src] |
Creates an iterator which can use peek
to look at the next element of the iterator without consuming it. Read more
fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where | [src] |
Creates an iterator that [skip
]s elements based on a predicate. Read more
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where | [src] |
Creates an iterator that yields elements based on a predicate. Read more
fn skip(self, n: usize) -> Skip<Self> | [src] |
Creates an iterator that skips the first n
elements. Read more
fn take(self, n: usize) -> Take<Self> | [src] |
Creates an iterator that yields its first n
elements. Read more
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where | [src] |
An iterator adaptor similar to [fold
] that holds internal state and produces a new iterator. Read more
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> where | [src] |
Creates an iterator that works like map, but flattens nested structure. Read more
fn flatten(self) -> Flatten<Self> where | 1.29.0 [src] |
Creates an iterator that flattens nested structure. Read more
fn fuse(self) -> Fuse<Self> | [src] |
Creates an iterator which ends after the first [None
]. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where | [src] |
Do something with each element of an iterator, passing the value on. Read more
fn by_ref(&mut self) -> &mut Self | [src] |
Borrows an iterator, rather than consuming it. Read more
| [src] |
Transforms an iterator into a collection. Read more
fn partition<B, F>(self, f: F) -> (B, B) where | [src] |
Consumes an iterator, creating two collections from it. Read more
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R where | 1.27.0 [src] |
An iterator method that applies a function as long as it returns successfully, producing a single, final value. Read more
fn try_for_each<F, R>(&mut self, f: F) -> R where | 1.27.0 [src] |
An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error. Read more
fn fold<B, F>(self, init: B, f: F) -> B where | [src] |
An iterator method that applies a function, producing a single, final value. Read more
fn all<F>(&mut self, f: F) -> bool where | [src] |
Tests if every element of the iterator matches a predicate. Read more
fn any<F>(&mut self, f: F) -> bool where | [src] |
Tests if any element of the iterator matches a predicate. Read more
fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where | [src] |
Searches for an element of an iterator that satisfies a predicate. Read more
fn find_map<B, F>(&mut self, f: F) -> Option<B> where | 1.30.0 [src] |
Applies function to the elements of iterator and returns the first non-none result. Read more
fn position<P>(&mut self, predicate: P) -> Option<usize> where | [src] |
Searches for an element in an iterator, returning its index. Read more
fn rposition<P>(&mut self, predicate: P) -> Option<usize> where | [src] |
Searches for an element in an iterator from the right, returning its index. Read more
fn max(self) -> Option<Self::Item> where | [src] |
Returns the maximum element of an iterator. Read more
fn min(self) -> Option<Self::Item> where | [src] |
Returns the minimum element of an iterator. Read more
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item> where | 1.6.0 [src] |
Returns the element that gives the maximum value from the specified function. Read more
fn max_by<F>(self, compare: F) -> Option<Self::Item> where | 1.15.0 [src] |
Returns the element that gives the maximum value with respect to the specified comparison function. Read more
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item> where | 1.6.0 [src] |
Returns the element that gives the minimum value from the specified function. Read more
fn min_by<F>(self, compare: F) -> Option<Self::Item> where | 1.15.0 [src] |
Returns the element that gives the minimum value with respect to the specified comparison function. Read more
fn rev(self) -> Rev<Self> where | [src] |
Reverses an iterator's direction. Read more
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where | [src] |
Converts an iterator of pairs into a pair of containers. Read more
fn copied<'a, T>(self) -> Copied<Self> where | [src] |
iter_copied
)Creates an iterator which copies all of its elements. Read more
fn cloned<'a, T>(self) -> Cloned<Self> where | [src] |
Creates an iterator which [clone
]s all of its elements. Read more
fn cycle(self) -> Cycle<Self> where | [src] |
Repeats an iterator endlessly. Read more
fn sum<S>(self) -> S where | 1.11.0 [src] |
Sums the elements of an iterator. Read more
fn product<P>(self) -> P where | 1.11.0 [src] |
Iterates over the entire iterator, multiplying all the elements Read more
fn cmp<I>(self, other: I) -> Ordering where | 1.5.0 [src] |
Lexicographically compares the elements of this Iterator
with those of another. Read more
fn partial_cmp<I>(self, other: I) -> Option<Ordering> where | 1.5.0 [src] |
Lexicographically compares the elements of this Iterator
with those of another. Read more
fn eq<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are equal to those of another. Read more
fn ne<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are unequal to those of another. Read more
fn lt<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are lexicographically less than those of another. Read more
fn le<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are lexicographically less or equal to those of another. Read more
fn gt<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are lexicographically greater than those of another. Read more
fn ge<I>(self, other: I) -> bool where | 1.5.0 [src] |
Determines if the elements of this Iterator
are lexicographically greater than or equal to those of another. Read more
impl<T> Unpin for Box<T> where
T: ?Sized,
1.33.0[src]
impl<T> Unpin for Box<T> where
T: ?Sized,
impl<I> DoubleEndedIterator for Box<I> where
I: DoubleEndedIterator + ?Sized,
[src]
impl<I> DoubleEndedIterator for Box<I> where
I: DoubleEndedIterator + ?Sized,
fn next_back(&mut self) -> Option<<I as Iterator>::Item> | [src] |
fn nth_back(&mut self, n: usize) -> Option<Self::Item> | [src] |
iter_nth_back
)Returns the n
th element from the end of the iterator. Read more
fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> R where | 1.27.0 [src] |
This is the reverse version of [try_fold()
]: it takes elements starting from the back of the iterator. Read more
fn rfold<B, F>(self, accum: B, f: F) -> B where | 1.27.0 [src] |
An iterator method that reduces the iterator's elements to a single, final value, starting from the back. Read more
fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item> where | 1.27.0 [src] |
Searches for an element of an iterator from the back that satisfies a predicate. Read more
impl<T> Debug for Box<T> where
T: Debug + ?Sized,
[src]
impl<T> Debug for Box<T> where
T: Debug + ?Sized,
impl<T> Display for Box<T> where
T: Display + ?Sized,
[src]
impl<T> Display for Box<T> where
T: Display + ?Sized,
impl<T> Generator for Box<T> where
T: Generator + ?Sized,
[src]
impl<T> Generator for Box<T> where
T: Generator + ?Sized,
type Yield = <T as Generator>::Yield
generator_trait
)The type of value this generator yields. Read more
type Return = <T as Generator>::Return
generator_trait
)The type of value this generator returns. Read more
unsafe fn resume( | [src] |
impl<T> Borrow<T> for Box<T> where
T: ?Sized,
1.1.0[src]
impl<T> Borrow<T> for Box<T> where
T: ?Sized,
impl<T> Ord for Box<T> where
T: Ord + ?Sized,
[src]
impl<T> Ord for Box<T> where
T: Ord + ?Sized,
fn cmp(&self, other: &Box<T>) -> Ordering | [src] |
fn max(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the minimum of two values. Read more
impl<T> Default for Box<T> where
T: Default,
[src]
impl<T> Default for Box<T> where
T: Default,
ⓘImportant traits for Box<W>
fn default() -> Box<T> | [src] |
Creates a Box<T>
, with the Default
value for T.
impl Default for Box<str>
1.17.0[src]
impl Default for Box<str>
impl<T> Default for Box<[T]>
[src]
impl<T> Default for Box<[T]>
impl<I> FusedIterator for Box<I> where
I: FusedIterator + ?Sized,
1.26.0[src]
impl<I> FusedIterator for Box<I> where
I: FusedIterator + ?Sized,
impl<T> Hasher for Box<T> where
T: Hasher + ?Sized,
1.22.0[src]
impl<T> Hasher for Box<T> where
T: Hasher + ?Sized,
fn finish(&self) -> u64 | [src] |
fn write(&mut self, bytes: &[u8]) | [src] |
fn write_u8(&mut self, i: u8) | [src] |
fn write_u16(&mut self, i: u16) | [src] |
fn write_u32(&mut self, i: u32) | [src] |
fn write_u64(&mut self, i: u64) | [src] |
fn write_u128(&mut self, i: u128) | [src] |
fn write_usize(&mut self, i: usize) | [src] |
fn write_i8(&mut self, i: i8) | [src] |
fn write_i16(&mut self, i: i16) | [src] |
fn write_i32(&mut self, i: i32) | [src] |
fn write_i64(&mut self, i: i64) | [src] |
fn write_i128(&mut self, i: i128) | [src] |
fn write_isize(&mut self, i: isize) | [src] |
impl<T> Drop for Box<T> where
T: ?Sized,
[src]
impl<T> Drop for Box<T> where
T: ?Sized,
impl<T> From<Box<T>> for Arc<T> where
T: ?Sized,
1.21.0[src]
impl<T> From<Box<T>> for Arc<T> where
T: ?Sized,
impl From<String> for Box<str>
1.20.0[src]
impl From<String> for Box<str>
ⓘImportant traits for Box<W>
fn from(s: String) -> Box<str> | [src] |
Converts the given String
to a boxed str
slice that is owned.
Examples
Basic usage:
let s1: String = String::from("hello world"); let s2: Box<str> = Box::from(s1); let s3: String = String::from(s2); assert_eq!("hello world", s3)
impl<T> From<Box<T>> for Rc<T> where
T: ?Sized,
1.21.0[src]
impl<T> From<Box<T>> for Rc<T> where
T: ?Sized,
impl From<Box<str>> for String
1.18.0[src]
impl From<Box<str>> for String
fn from(s: Box<str>) -> String | [src] |
Converts the given boxed str
slice to a String
.
It is notable that the str
slice is owned.
Examples
Basic usage:
let s1: String = String::from("hello world"); let s2: Box<str> = s1.into_boxed_str(); let s3: String = String::from(s2); assert_eq!("hello world", s3)
impl<'a, T> From<&'a [T]> for Box<[T]> where
T: Copy,
1.17.0[src]
impl<'a, T> From<&'a [T]> for Box<[T]> where
T: Copy,
ⓘImportant traits for Box<W>
fn from(slice: &'a [T]) -> Box<[T]> | [src] |
Converts a &[T]
into a Box<[T]>
This conversion allocates on the heap
and performs a copy of slice
.
Examples
// create a &[u8] which will be used to create a Box<[u8]> let slice: &[u8] = &[104, 101, 108, 108, 111]; let boxed_slice: Box<[u8]> = Box::from(slice); println!("{:?}", boxed_slice);
impl<'a> From<&'a str> for Box<str>
1.17.0[src]
impl<'a> From<&'a str> for Box<str>
ⓘImportant traits for Box<W>
fn from(s: &'a str) -> Box<str> | [src] |
Converts a &str
into a Box<str>
This conversion allocates on the heap
and performs a copy of s
.
Examples
let boxed: Box<str> = Box::from("hello"); println!("{}", boxed);
impl<T> From<Box<[T]>> for Vec<T>
1.18.0[src]
impl<T> From<Box<[T]>> for Vec<T>
impl<T> From<Vec<T>> for Box<[T]>
1.20.0[src]
impl<T> From<Vec<T>> for Box<[T]>
impl<T> From<T> for Box<T>
1.6.0[src]
impl<T> From<T> for Box<T>
ⓘImportant traits for Box<W>
fn from(t: T) -> Box<T> | [src] |
Converts a generic type T
into a Box<T>
The conversion allocates on the heap and moves t
from the stack into it.
Examples
let x = 5; let boxed = Box::new(5); assert_eq!(Box::from(x), boxed);
impl From<Box<str>> for Box<[u8]>
1.19.0[src]
impl From<Box<str>> for Box<[u8]>
ⓘImportant traits for Box<W>
fn from(s: Box<str>) -> Box<[u8]> | [src] |
Converts a Box<str>>
into a Box<[u8]>
This conversion does not allocate on the heap and happens in place.
Examples
// create a Box<str> which will be used to create a Box<[u8]> let boxed: Box<str> = Box::from("hello"); let boxed_str: Box<[u8]> = Box::from(boxed); // create a &[u8] which will be used to create a Box<[u8]> let slice: &[u8] = &[104, 101, 108, 108, 111]; let boxed_slice = Box::from(slice); assert_eq!(boxed_slice, boxed_str);
impl<T> AsRef<T> for Box<T> where
T: ?Sized,
1.5.0[src]
impl<T> AsRef<T> for Box<T> where
T: ?Sized,
Auto Trait Implementations
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
[src]
impl<T, U> Into for T where
U: From<T>,
impl<T> ToOwned for T where
T: Clone,
[src]
impl<T> ToOwned for T where
T: Clone,
impl<T> From for T
[src]
impl<T> From for T
impl<I> IntoIterator for I where
I: Iterator,
[src]
impl<I> IntoIterator for I where
I: Iterator,
type Item = <I as Iterator>::Item
The type of the elements being iterated over.
type IntoIter = I
Which kind of iterator are we turning this into?
fn into_iter(self) -> I | [src] |
impl<T> ToString for T where
T: Display + ?Sized,
[src]
impl<T> ToString for T where
T: Display + ?Sized,
impl<T, U> TryFrom for T where
T: From<U>,
[src]
impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error> | [src] |
impl<T> Borrow for T where
T: ?Sized,
[src]
impl<T> Borrow for T where
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
[src]
impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId | [src] |
impl<T, U> TryInto for T where
U: TryFrom<T>,
[src]
impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error> | [src] |
impl<T> BorrowMut for T where
T: ?Sized,
[src]
impl<T> BorrowMut for T where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T | [src] |
impl<A, F> FnBox for F where
F: FnOnce<A>,
[src]
impl<A, F> FnBox for F where
F: FnOnce<A>,