Struct snarkvm_wasm::alloc::Global

pub struct Global;

🔬This is a nightly-only experimental API. (allocator_api)

The global memory allocator.

This type implements the Allocator trait by forwarding calls to the allocator registered with the #[global_allocator] attribute if there is one, or the std crate’s default.

Note: while this type is unstable, the functionality it provides can be accessed through the free functions in alloc.

Implementations

impl<T> Box<T, Global>

pub fn new(x: T) -> Box<T, Global>

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 new_uninit() -> Box<MaybeUninit<T>, Global>

🔬This is a nightly-only experimental API. (new_uninit)

Constructs a new box with uninitialized contents.

Examples

#![feature(new_uninit)]

let mut five = Box::<u32>::new_uninit();

let five = unsafe {
    // Deferred initialization:
    five.as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5)

pub fn new_zeroed() -> Box<MaybeUninit<T>, Global>

🔬This is a nightly-only experimental API. (new_uninit)

Constructs a new Box with uninitialized contents, with the memory being filled with 0 bytes.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(new_uninit)]

let zero = Box::<u32>::new_zeroed();
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0)

pub fn pin(x: T) -> Pin<Box<T, Global>>

Constructs a new Pin<Box<T>>. If T does not implement Unpin, then x will be pinned in memory and unable to be moved.

Constructing and pinning of the Box can also be done in two steps: Box::pin(x) does the same as Box::into_pin(Box::new(x)). Consider using into_pin if you already have a Box<T>, or if you want to construct a (pinned) Box in a different way than with Box::new.

pub fn try_new(x: T) -> Result<Box<T, Global>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Allocates memory on the heap then places x into it, returning an error if the allocation fails

This doesn’t actually allocate if T is zero-sized.

Examples

#![feature(allocator_api)]

let five = Box::try_new(5)?;

pub fn try_new_uninit() -> Result<Box<MaybeUninit<T>, Global>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new box with uninitialized contents on the heap, returning an error if the allocation fails

Examples

#![feature(allocator_api, new_uninit)]

let mut five = Box::<u32>::try_new_uninit()?;

let five = unsafe {
    // Deferred initialization:
    five.as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5);

pub fn try_new_zeroed() -> Result<Box<MaybeUninit<T>, Global>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Box with uninitialized contents, with the memory being filled with 0 bytes on the heap

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api, new_uninit)]

let zero = Box::<u32>::try_new_zeroed()?;
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0);

impl<T> Box<[T], Global>

pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>], Global>

🔬This is a nightly-only experimental API. (new_uninit)

Constructs a new boxed slice with uninitialized contents.

Examples

#![feature(new_uninit)]

let mut values = Box::<[u32]>::new_uninit_slice(3);

let values = unsafe {
    // Deferred initialization:
    values[0].as_mut_ptr().write(1);
    values[1].as_mut_ptr().write(2);
    values[2].as_mut_ptr().write(3);

    values.assume_init()
};

assert_eq!(*values, [1, 2, 3])

pub fn new_zeroed_slice(len: usize) -> Box<[MaybeUninit<T>], Global>

🔬This is a nightly-only experimental API. (new_uninit)

Constructs a new boxed slice with uninitialized contents, with the memory being filled with 0 bytes.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(new_uninit)]

let values = Box::<[u32]>::new_zeroed_slice(3);
let values = unsafe { values.assume_init() };

assert_eq!(*values, [0, 0, 0])

pub fn try_new_uninit_slice(
    len: usize
) -> Result<Box<[MaybeUninit<T>], Global>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new boxed slice with uninitialized contents. Returns an error if the allocation fails

Examples

#![feature(allocator_api, new_uninit)]

let mut values = Box::<[u32]>::try_new_uninit_slice(3)?;
let values = unsafe {
    // Deferred initialization:
    values[0].as_mut_ptr().write(1);
    values[1].as_mut_ptr().write(2);
    values[2].as_mut_ptr().write(3);
    values.assume_init()
};

assert_eq!(*values, [1, 2, 3]);

pub fn try_new_zeroed_slice(
    len: usize
) -> Result<Box<[MaybeUninit<T>], Global>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new boxed slice with uninitialized contents, with the memory being filled with 0 bytes. Returns an error if the allocation fails

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api, new_uninit)]

let values = Box::<[u32]>::try_new_zeroed_slice(3)?;
let values = unsafe { values.assume_init() };

assert_eq!(*values, [0, 0, 0]);

impl<T> Box<T, Global>where
    T: ?Sized,

pub unsafe fn from_raw(raw: *mut T) -> Box<T, Global>

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. For this to be safe, the memory must have been allocated in accordance with the memory layout used by Box .

Safety

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.

The safety conditions are described in the memory layout section.

Examples

Recreate a Box which was previously converted to a raw pointer using Box::into_raw:

let x = Box::new(5);
let ptr = Box::into_raw(x);
let x = unsafe { Box::from_raw(ptr) };

Manually create a Box from scratch by using the global allocator:

use std::alloc::{alloc, Layout};

unsafe {
    let ptr = alloc(Layout::new::<i32>()) as *mut i32;
    // In general .write is required to avoid attempting to destruct
    // the (uninitialized) previous contents of `ptr`, though for this
    // simple example `*ptr = 5` would have worked as well.
    ptr.write(5);
    let x = Box::from_raw(ptr);
}

Trait Implementations

impl Allocator for Global

fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to allocate a block of memory.

fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Behaves like allocate, but also ensures that the returned memory is zero-initialized.

unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout)

🔬This is a nightly-only experimental API. (allocator_api)

Deallocates the memory referenced by ptr.

unsafe fn grow(
    &self,
    ptr: NonNull<u8>,
    old_layout: Layout,
    new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to extend the memory block.

unsafe fn grow_zeroed(
    &self,
    ptr: NonNull<u8>,
    old_layout: Layout,
    new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Behaves like grow, but also ensures that the new contents are set to zero before being returned.

unsafe fn shrink(
    &self,
    ptr: NonNull<u8>,
    old_layout: Layout,
    new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to shrink the memory block.

fn by_ref(&self) -> &Selfwhere
    Self: Sized,

🔬This is a nightly-only experimental API. (allocator_api)

Creates a “by reference” adapter for this instance of Allocator.

impl<T> AsFd for Box<T, Global>where
    T: AsFd,

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl<T> AsRawFd for Box<T, Global>where
    T: AsRawFd,

fn as_raw_fd(&self) -> i32

Extracts the raw file descriptor.

impl<T> AsyncBufRead for Box<T, Global>where
    T: AsyncBufRead + Unpin + ?Sized,

fn poll_fill_buf(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<&[u8], Error>>

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

fn consume(self: Pin<&mut Box<T, Global>>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read.

impl<S> AsyncIterator for Box<S, Global>where
    S: AsyncIterator + Unpin + ?Sized,

type Item = <S as AsyncIterator>::Item

🔬This is a nightly-only experimental API. (async_iterator)

The type of items yielded by the async iterator.

fn poll_next(
    self: Pin<&mut Box<S, Global>>,
    cx: &mut Context<'_>
) -> Poll<Option<<Box<S, Global> as AsyncIterator>::Item>>

🔬This is a nightly-only experimental API. (async_iterator)

Attempt to pull out the next value of this async iterator, registering the current task for wakeup if the value is not yet available, and returning None if the async iterator is exhausted.

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

🔬This is a nightly-only experimental API. (async_iterator)

Returns the bounds on the remaining length of the async iterator.

impl<T> AsyncRead for Box<T, Global>where
    T: AsyncRead + Unpin + ?Sized,

fn poll_read(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>,
    buf: &mut ReadBuf<'_>
) -> Poll<Result<(), Error>>

Attempts to read from the AsyncRead into buf.

impl<T> AsyncSeek for Box<T, Global>where
    T: AsyncSeek + Unpin + ?Sized,

fn start_seek(self: Pin<&mut Box<T, Global>>, pos: SeekFrom) -> Result<(), Error>

Attempts to seek to an offset, in bytes, in a stream.

fn poll_complete(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<u64, Error>>

Waits for a seek operation to complete.

impl<T> AsyncWrite for Box<T, Global>where
    T: AsyncWrite + Unpin + ?Sized,

fn poll_write(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>,
    buf: &[u8]
) -> Poll<Result<usize, Error>>

Attempt to write bytes from buf into the object.

fn poll_write_vectored(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>,
    bufs: &[IoSlice<'_>]
) -> Poll<Result<usize, Error>>

Like poll_write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation.

fn poll_flush(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Error>>

Attempts to flush the object, ensuring that any buffered data reach their destination.

fn poll_shutdown(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Error>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down.

impl<T> Body for Box<T, Global>where
    T: Body + Unpin + ?Sized,

type Data = <T as Body>::Data

Values yielded by the Body.

type Error = <T as Body>::Error

The error type this Body might generate.

fn poll_data(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Option<Result<<Box<T, Global> as Body>::Data, <Box<T, Global> as Body>::Error>>>

Attempt to pull out the next data buffer of this stream.

fn poll_trailers(
    self: Pin<&mut Box<T, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<Option<HeaderMap<HeaderValue>>, <Box<T, Global> as Body>::Error>>

Poll for an optional single HeaderMap of trailers.

fn is_end_stream(&self) -> bool

Returns true when the end of stream has been reached.

fn size_hint(&self) -> SizeHint

Returns the bounds on the remaining length of the stream.

fn data(&mut self) -> Data<'_, Self>where
    Self: Unpin + Sized,

Returns future that resolves to next data chunk, if any.

fn trailers(&mut self) -> Trailers<'_, Self>where
    Self: Unpin + Sized,

Returns future that resolves to trailers, if any.

fn map_data<F, B>(self, f: F) -> MapData<Self, F>where
    Self: Sized,
    F: FnMut(Self::Data) -> B,
    B: Buf,

Maps this body’s data value to a different value.

fn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
    Self: Sized,
    F: FnMut(Self::Error) -> E,

Maps this body’s error value to a different value.

impl<T> Buf for Box<T, Global>where
    T: Buf + ?Sized,

fn remaining(&self) -> usize

Returns the number of bytes between the current position and the end of the buffer.

fn chunk(&self) -> &[u8]

Returns a slice starting at the current position and of length between 0 and Buf::remaining(). Note that this can return shorter slice (this allows non-continuous internal representation).

fn chunks_vectored<'b>(&'b self, dst: &mut [IoSlice<'b>]) -> usize

Fills dst with potentially multiple slices starting at self’s current position.

fn advance(&mut self, cnt: usize)

Advance the internal cursor of the Buf

fn has_remaining(&self) -> bool

Returns true if there are any more bytes to consume

fn copy_to_slice(&mut self, dst: &mut [u8])

Copies bytes from self into dst.

fn get_u8(&mut self) -> u8

Gets an unsigned 8 bit integer from self.

fn get_i8(&mut self) -> i8

Gets a signed 8 bit integer from self.

fn get_u16(&mut self) -> u16

Gets an unsigned 16 bit integer from self in big-endian byte order.

fn get_u16_le(&mut self) -> u16

Gets an unsigned 16 bit integer from self in little-endian byte order.

fn get_i16(&mut self) -> i16

Gets a signed 16 bit integer from self in big-endian byte order.

fn get_i16_le(&mut self) -> i16

Gets a signed 16 bit integer from self in little-endian byte order.

fn get_u32(&mut self) -> u32

Gets an unsigned 32 bit integer from self in the big-endian byte order.

fn get_u32_le(&mut self) -> u32

Gets an unsigned 32 bit integer from self in the little-endian byte order.

fn get_i32(&mut self) -> i32

Gets a signed 32 bit integer from self in big-endian byte order.

fn get_i32_le(&mut self) -> i32

Gets a signed 32 bit integer from self in little-endian byte order.

fn get_u64(&mut self) -> u64

Gets an unsigned 64 bit integer from self in big-endian byte order.

fn get_u64_le(&mut self) -> u64

Gets an unsigned 64 bit integer from self in little-endian byte order.

fn get_i64(&mut self) -> i64

Gets a signed 64 bit integer from self in big-endian byte order.

fn get_i64_le(&mut self) -> i64

Gets a signed 64 bit integer from self in little-endian byte order.

fn get_uint(&mut self, nbytes: usize) -> u64

Gets an unsigned n-byte integer from self in big-endian byte order.

fn get_uint_le(&mut self, nbytes: usize) -> u64

Gets an unsigned n-byte integer from self in little-endian byte order.

fn get_int(&mut self, nbytes: usize) -> i64

Gets a signed n-byte integer from self in big-endian byte order.

fn get_int_le(&mut self, nbytes: usize) -> i64

Gets a signed n-byte integer from self in little-endian byte order.

fn copy_to_bytes(&mut self, len: usize) -> Bytes

Consumes len bytes inside self and returns new instance of Bytes with this data.

fn get_u128(&mut self) -> u128

Gets an unsigned 128 bit integer from self in big-endian byte order.

fn get_u128_le(&mut self) -> u128

Gets an unsigned 128 bit integer from self in little-endian byte order.

fn get_i128(&mut self) -> i128

Gets a signed 128 bit integer from self in big-endian byte order.

fn get_i128_le(&mut self) -> i128

Gets a signed 128 bit integer from self in little-endian byte order.

fn get_f32(&mut self) -> f32

Gets an IEEE754 single-precision (4 bytes) floating point number from self in big-endian byte order.

fn get_f32_le(&mut self) -> f32

Gets an IEEE754 single-precision (4 bytes) floating point number from self in little-endian byte order.

fn get_f64(&mut self) -> f64

Gets an IEEE754 double-precision (8 bytes) floating point number from self in big-endian byte order.

fn get_f64_le(&mut self) -> f64

Gets an IEEE754 double-precision (8 bytes) floating point number from self in little-endian byte order.

fn take(self, limit: usize) -> Take<Self>where
    Self: Sized,

Creates an adaptor which will read at most limit bytes from self.

fn chain<U>(self, next: U) -> Chain<Self, U>where
    U: Buf,
    Self: Sized,

Creates an adaptor which will chain this buffer with another.

fn reader(self) -> Reader<Self>where
    Self: Sized,

Creates an adaptor which implements the Read trait for self.

impl<T> BufMut for Box<T, Global>where
    T: BufMut + ?Sized,

fn remaining_mut(&self) -> usize

Returns the number of bytes that can be written from the current position until the end of the buffer is reached.

fn chunk_mut(&mut self) -> &mut UninitSlice

Returns a mutable slice starting at the current BufMut position and of length between 0 and BufMut::remaining_mut(). Note that this can be shorter than the whole remainder of the buffer (this allows non-continuous implementation).

unsafe fn advance_mut(&mut self, cnt: usize)

Advance the internal cursor of the BufMut

fn put_slice(&mut self, src: &[u8])

Transfer bytes into self from src and advance the cursor by the number of bytes written.

fn put_u8(&mut self, n: u8)

Writes an unsigned 8 bit integer to self.

fn put_i8(&mut self, n: i8)

Writes a signed 8 bit integer to self.

fn put_u16(&mut self, n: u16)

Writes an unsigned 16 bit integer to self in big-endian byte order.

fn put_u16_le(&mut self, n: u16)

Writes an unsigned 16 bit integer to self in little-endian byte order.

fn put_i16(&mut self, n: i16)

Writes a signed 16 bit integer to self in big-endian byte order.

fn put_i16_le(&mut self, n: i16)

Writes a signed 16 bit integer to self in little-endian byte order.

fn put_u32(&mut self, n: u32)

Writes an unsigned 32 bit integer to self in big-endian byte order.

fn put_u32_le(&mut self, n: u32)

Writes an unsigned 32 bit integer to self in little-endian byte order.

fn put_i32(&mut self, n: i32)

Writes a signed 32 bit integer to self in big-endian byte order.

fn put_i32_le(&mut self, n: i32)

Writes a signed 32 bit integer to self in little-endian byte order.

fn put_u64(&mut self, n: u64)

Writes an unsigned 64 bit integer to self in the big-endian byte order.

fn put_u64_le(&mut self, n: u64)

Writes an unsigned 64 bit integer to self in little-endian byte order.

fn put_i64(&mut self, n: i64)

Writes a signed 64 bit integer to self in the big-endian byte order.

fn put_i64_le(&mut self, n: i64)

Writes a signed 64 bit integer to self in little-endian byte order.

fn has_remaining_mut(&self) -> bool

Returns true if there is space in self for more bytes.

fn put<T>(&mut self, src: T)where
    T: Buf,
    Self: Sized,

Transfer bytes into self from src and advance the cursor by the number of bytes written.

fn put_bytes(&mut self, val: u8, cnt: usize)

Put cnt bytes val into self.

fn put_u128(&mut self, n: u128)

Writes an unsigned 128 bit integer to self in the big-endian byte order.

fn put_u128_le(&mut self, n: u128)

Writes an unsigned 128 bit integer to self in little-endian byte order.

fn put_i128(&mut self, n: i128)

Writes a signed 128 bit integer to self in the big-endian byte order.

fn put_i128_le(&mut self, n: i128)

Writes a signed 128 bit integer to self in little-endian byte order.

fn put_uint(&mut self, n: u64, nbytes: usize)

Writes an unsigned n-byte integer to self in big-endian byte order.

fn put_uint_le(&mut self, n: u64, nbytes: usize)

Writes an unsigned n-byte integer to self in the little-endian byte order.

fn put_int(&mut self, n: i64, nbytes: usize)

Writes low nbytes of a signed integer to self in big-endian byte order.

fn put_int_le(&mut self, n: i64, nbytes: usize)

Writes low nbytes of a signed integer to self in little-endian byte order.

fn put_f32(&mut self, n: f32)

Writes an IEEE754 single-precision (4 bytes) floating point number to self in big-endian byte order.

fn put_f32_le(&mut self, n: f32)

Writes an IEEE754 single-precision (4 bytes) floating point number to self in little-endian byte order.

fn put_f64(&mut self, n: f64)

Writes an IEEE754 double-precision (8 bytes) floating point number to self in big-endian byte order.

fn put_f64_le(&mut self, n: f64)

Writes an IEEE754 double-precision (8 bytes) floating point number to self in little-endian byte order.

fn limit(self, limit: usize) -> Limit<Self>where
    Self: Sized,

Creates an adaptor which can write at most limit bytes to self.

fn writer(self) -> Writer<Self>where
    Self: Sized,

Creates an adaptor which implements the Write trait for self.

fn chain_mut<U>(self, next: U) -> Chain<Self, U>where
    U: BufMut,
    Self: Sized,

Creates an adapter which will chain this buffer with another.

impl<B> BufRead for Box<B, Global>where
    B: BufRead + ?Sized,

fn fill_buf(&mut self) -> Result<&[u8], Error>

Returns the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

fn consume(&mut self, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to read.

fn read_until(
    &mut self,
    byte: u8,
    buf: &mut Vec<u8, Global>
) -> Result<usize, Error>

Read all bytes into buf until the delimiter byte or EOF is reached.

fn read_line(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. You do not need to clear the buffer before appending.

fn has_data_left(&mut self) -> Result<bool, Error>

🔬This is a nightly-only experimental API. (buf_read_has_data_left)

Check if the underlying Read has any data left to be read.

fn split(self, byte: u8) -> Split<Self>where
    Self: Sized,

Returns an iterator over the contents of this reader split on the byte byte.

fn lines(self) -> Lines<Self>where
    Self: Sized,

Returns an iterator over the lines of this reader.

impl Clone for Box<CStr, Global>

fn clone(&self) -> Box<CStr, Global>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Clone for Box<OsStr, Global>

fn clone(&self) -> Box<OsStr, Global>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Clone for Box<Path, Global>

fn clone(&self) -> Box<Path, Global>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Clone for Box<str, Global>

fn clone(&self) -> Box<str, Global>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Clone for Global

fn clone(&self) -> Global

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Global

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

Formats the value using the given formatter.

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

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

Returns the “default value” for a type.

impl Default for Box<CStr, Global>

fn default() -> Box<CStr, Global>

Returns the “default value” for a type.

impl Default for Box<OsStr, Global>

fn default() -> Box<OsStr, Global>

Returns the “default value” for a type.

impl<T> Default for Box<T, Global>where
    T: Default,

fn default() -> Box<T, Global>

Creates a Box<T>, with the Default value for T.

impl Default for Box<str, Global>

fn default() -> Box<str, Global>

Returns the “default value” for a type.

impl Default for Global

fn default() -> Global

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Box<[T], Global>where
    T: Deserialize<'de>,

fn deserialize<D>(
    deserializer: D
) -> Result<Box<[T], Global>, <D as Deserializer<'de>>::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserialize<'de> for Box<CStr, Global>

fn deserialize<D>(
    deserializer: D
) -> Result<Box<CStr, Global>, <D as Deserializer<'de>>::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserialize<'de> for Box<Path, Global>

fn deserialize<D>(
    deserializer: D
) -> Result<Box<Path, Global>, <D as Deserializer<'de>>::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de, T> Deserialize<'de> for Box<T, Global>where
    T: Deserialize<'de>,

fn deserialize<D>(
    deserializer: D
) -> Result<Box<T, Global>, <D as Deserializer<'de>>::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserialize<'de> for Box<str, Global>

fn deserialize<D>(
    deserializer: D
) -> Result<Box<str, Global>, <D as Deserializer<'de>>::Error>where
    D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Error for Box<ErrorKind, Global>

fn custom<T>(desc: T) -> Box<ErrorKind, Global>where
    T: Display,

Raised when there is general error when deserializing a type.

fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a type different from what it was expecting.

fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a value of the right type but that is wrong for some other reason.

fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements.

fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize enum type received a variant with an unrecognized name.

fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize struct type received a field with an unrecognized name.

fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.

fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.

impl Error for Box<ErrorKind, Global>

fn custom<T>(msg: T) -> Box<ErrorKind, Global>where
    T: Display,

Used when a Serialize implementation encounters any error while serializing a type.

impl<T> Error for Box<T, Global>where
    T: Error,

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

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

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

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

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

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

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

Provides type based access to context intended for error reports.

impl<T> From<&[T]> for Box<[T], Global>where
    T: Copy,

fn from(slice: &[T]) -> Box<[T], Global>

Converts a &[T] into a Box<[T]>

This conversion allocates on the heap and performs a copy of slice and its contents.

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 From<&CStr> for Box<CStr, Global>

fn from(s: &CStr) -> Box<CStr, Global>

Converts a &CStr into a Box<CStr>, by copying the contents into a newly allocated Box.

impl From<&OsStr> for Box<OsStr, Global>

fn from(s: &OsStr) -> Box<OsStr, Global>

Copies the string into a newly allocated Box<OsStr>.

impl From<&Path> for Box<Path, Global>

fn from(path: &Path) -> Box<Path, Global>

Creates a boxed Path from a reference.

This will allocate and clone path to it.

impl From<&str> for Box<dyn Error + 'static, Global>

fn from(err: &str) -> Box<dyn Error + 'static, Global>

Converts a str into a box of dyn Error.

Examples

use std::error::Error;
use std::mem;

let a_str_error = "a str error";
let a_boxed_error = Box::<dyn Error>::from(a_str_error);
assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))

impl<'a> From<&str> for Box<dyn Error + Sync + Send + 'a, Global>

fn from(err: &str) -> Box<dyn Error + Sync + Send + 'a, Global>

Converts a str into a box of dyn Error + Send + Sync.

Examples

use std::error::Error;
use std::mem;

let a_str_error = "a str error";
let a_boxed_error = Box::<dyn Error + Send + Sync>::from(a_str_error);
assert!(
    mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))

impl From<&str> for Box<str, Global>

fn from(s: &str) -> Box<str, Global>

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, const N: usize> From<[T; N]> for Box<[T], Global>

fn from(array: [T; N]) -> Box<[T], Global>

Converts a [T; N] into a Box<[T]>

This conversion moves the array to newly heap-allocated memory.

Examples

let boxed: Box<[u8]> = Box::from([4, 2]);
println!("{boxed:?}");

impl From<CString> for Box<CStr, Global>

fn from(s: CString) -> Box<CStr, Global>

Converts a CString into a Box<CStr> without copying or allocating.

impl<T> From<Cow<'_, [T]>> for Box<[T], Global>where
    T: Copy,

fn from(cow: Cow<'_, [T]>) -> Box<[T], Global>

Converts a Cow<'_, [T]> into a Box<[T]>

When cow is the Cow::Borrowed variant, this conversion allocates on the heap and copies the underlying slice. Otherwise, it will try to reuse the owned Vec’s allocation.

impl From<Cow<'_, CStr>> for Box<CStr, Global>

fn from(cow: Cow<'_, CStr>) -> Box<CStr, Global>

Converts a Cow<'a, CStr> into a Box<CStr>, by copying the contents if they are borrowed.

impl From<Cow<'_, OsStr>> for Box<OsStr, Global>

fn from(cow: Cow<'_, OsStr>) -> Box<OsStr, Global>

Converts a Cow<'a, OsStr> into a Box<OsStr>, by copying the contents if they are borrowed.

impl From<Cow<'_, Path>> for Box<Path, Global>

fn from(cow: Cow<'_, Path>) -> Box<Path, Global>

Creates a boxed Path from a clone-on-write pointer.

Converting from a Cow::Owned does not clone or allocate.

impl From<Cow<'_, str>> for Box<str, Global>

fn from(cow: Cow<'_, str>) -> Box<str, Global>

Converts a Cow<'_, str> into a Box<str>

When cow is the Cow::Borrowed variant, this conversion allocates on the heap and copies the underlying str. Otherwise, it will try to reuse the owned String’s allocation.

Examples

use std::borrow::Cow;

let unboxed = Cow::Borrowed("hello");
let boxed: Box<str> = Box::from(unboxed);
println!("{boxed}");

let unboxed = Cow::Owned("hello".to_string());
let boxed: Box<str> = Box::from(unboxed);
println!("{boxed}");

impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static, Global>

fn from(err: Cow<'a, str>) -> Box<dyn Error + 'static, Global>

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::<dyn Error>::from(a_cow_str_error);
assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))

impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + Sync + Send + 'a, Global>

fn from(err: Cow<'b, str>) -> Box<dyn Error + Sync + Send + 'a, Global>

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::<dyn 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<'a, E> From<E> for Box<dyn Error + 'a, Global>where
    E: 'a + Error,

fn from(err: E) -> Box<dyn Error + 'a, Global>

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 {}

let an_error = AnError;
assert!(0 == mem::size_of_val(&an_error));
let a_boxed_error = Box::<dyn Error>::from(an_error);
assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))

impl<'a, E> From<E> for Box<dyn Error + Sync + Send + 'a, Global>where
    E: 'a + Error + Send + Sync,

fn from(err: E) -> Box<dyn Error + Sync + Send + 'a, Global>

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 {}

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::<dyn Error + Send + Sync>::from(an_error);
assert!(
    mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))

impl From<Error> for Box<ErrorKind, Global>

fn from(err: Error) -> Box<ErrorKind, Global>

Converts to this type from the input type.

impl From<Error> for Box<dyn Error + 'static, Global>

fn from(error: Error) -> Box<dyn Error + 'static, Global>

Converts to this type from the input type.

impl From<Error> for Box<dyn Error + Send + 'static, Global>

fn from(error: Error) -> Box<dyn Error + Send + 'static, Global>

Converts to this type from the input type.

impl From<Error> for Box<dyn Error + Sync + Send + 'static, Global>

fn from(error: Error) -> Box<dyn Error + Sync + Send + 'static, Global>

Converts to this type from the input type.

impl From<OsString> for Box<OsStr, Global>

fn from(s: OsString) -> Box<OsStr, Global>

Converts an OsString into a Box<OsStr> without copying or allocating.

impl From<PathBuf> for Box<Path, Global>

fn from(p: PathBuf) -> Box<Path, Global>

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 From<String> for Box<dyn Error + 'static, Global>

fn from(str_err: String) -> Box<dyn Error + 'static, Global>

Converts a String into a box of dyn Error.

Examples

use std::error::Error;
use std::mem;

let a_string_error = "a string error".to_string();
let a_boxed_error = Box::<dyn Error>::from(a_string_error);
assert!(mem::size_of::<Box<dyn Error>>() == mem::size_of_val(&a_boxed_error))

impl From<String> for Box<dyn Error + Sync + Send + 'static, Global>

fn from(err: String) -> Box<dyn Error + Sync + Send + 'static, Global>

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::<dyn Error + Send + Sync>::from(a_string_error);
assert!(
    mem::size_of::<Box<dyn Error + Send + Sync>>() == mem::size_of_val(&a_boxed_error))

impl From<String> for Box<str, Global>

fn from(s: String) -> Box<str, Global>

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<T> for Box<T, Global>

fn from(t: T) -> Box<T, Global>

Converts a 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<I> FromIterator<I> for Box<[I], Global>

fn from_iter<T>(iter: T) -> Box<[I], Global>where
    T: IntoIterator<Item = I>,

Creates a value from an iterator.

impl FromWasmAbi for Box<[JsValue], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[JsValue], Global>

Recover a Self from Self::Abi.

impl<T> FromWasmAbi for Box<[T], Global>where
    T: JsObject,

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[T], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[f32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[f32], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[f64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[f64], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[i16], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[i16], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[i32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[i32], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[i64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[i64], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[i8], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[i8], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[isize], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[isize], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[u16], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[u16], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[u32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[u32], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[u64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[u64], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[u8], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[u8], Global>

Recover a Self from Self::Abi.

impl FromWasmAbi for Box<[usize], Global>

type Abi = WasmSlice

The wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: WasmSlice) -> Box<[usize], Global>

Recover a Self from Self::Abi.

impl<F> FusedFuture for Box<F, Global>where
    F: FusedFuture + Unpin + ?Sized,

fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.

impl<S> FusedStream for Box<S, Global>where
    S: FusedStream + Unpin + ?Sized,

fn is_terminated(&self) -> bool

Returns true if the stream should no longer be polled.

impl IntoWasmAbi for Box<[JsValue], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl<T> IntoWasmAbi for Box<[T], Global>where
    T: JsObject,

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[f32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[f64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[i16], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[i32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[i64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[i8], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[isize], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[u16], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[u32], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[u64], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[u8], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl IntoWasmAbi for Box<[usize], Global>

type Abi = WasmSlice

The wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> WasmSlice

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl OptionFromWasmAbi for Box<[JsValue], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl<T> OptionFromWasmAbi for Box<[T], Global>where
    T: JsObject,

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[f32], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[f64], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[i16], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[i32], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[i64], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[i8], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[isize], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[u16], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[u32], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[u64], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[u8], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionFromWasmAbi for Box<[usize], Global>

fn is_none(slice: &WasmSlice) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionIntoWasmAbi for Box<[JsValue], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl<T> OptionIntoWasmAbi for Box<[T], Global>where
    T: JsObject,

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[f32], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[f64], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[i16], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[i32], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[i64], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[i8], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[isize], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[u16], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[u32], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[u64], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[u8], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Box<[usize], Global>

fn none() -> WasmSlice

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl<'a, I, O, E> Parser<I, O, E> for Box<dyn Parser<I, O, E> + 'a, Global>

fn parse(&mut self, input: I) -> Result<(I, O), Err<E>>

A parser takes in input type, and returns a Result containing either the remaining input and the output value, or an error

fn map<G, O2>(self, g: G) -> Map<Self, G, O>where
    G: Fn(O) -> O2,
    Self: Sized,

Maps a function over the result of a parser

fn flat_map<G, H, O2>(self, g: G) -> FlatMap<Self, G, O>where
    G: FnMut(O) -> H,
    H: Parser<I, O2, E>,
    Self: Sized,

Creates a second parser from the output of the first one, then apply over the rest of the input

fn and_then<G, O2>(self, g: G) -> AndThen<Self, G, O>where
    G: Parser<O, O2, E>,
    Self: Sized,

Applies a second parser over the output of the first one

fn and<G, O2>(self, g: G) -> And<Self, G>where
    G: Parser<I, O2, E>,
    Self: Sized,

Applies a second parser after the first one, return their results as a tuple

fn or<G>(self, g: G) -> Or<Self, G>where
    G: Parser<I, O, E>,
    Self: Sized,

Applies a second parser over the input if the first one failed

fn into<O2, E2>(self) -> Into<Self, O, O2, E, E2>where
    O2: From<O>,
    E2: From<E>,
    Self: Sized,

automatically converts the parser’s output and error values to another type, as long as they implement the From trait

impl<R> Read for Box<R, Global>where
    R: Read + ?Sized,

fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_buf(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8, Global>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Read the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Selfwhere
    Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>where
    Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>where
    R: Read,
    Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>where
    Self: Sized,

Creates an adapter which will read at most limit bytes from it.

impl<R> RngCore for Box<R, Global>where
    R: RngCore + ?Sized,

fn next_u32(&mut self) -> u32

Return the next random u32.

fn next_u64(&mut self) -> u64

Return the next random u64.

fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data.

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

Fill dest entirely with random data.

impl<S> Seek for Box<S, Global>where
    S: Seek + ?Sized,

fn seek(&mut self, pos: SeekFrom) -> Result<u64, Error>

Seek to an offset, in bytes, in a stream.

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

impl<T> Serialize for Box<T, Global>where
    T: Serialize + ?Sized,

fn serialize<S>(
    &self,
    serializer: S
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
    S: Serializer,

Serialize this value into the given Serde serializer.

impl<S, Request> Service<Request> for Box<S, Global>where
    S: Service<Request> + ?Sized,

type Response = <S as Service<Request>>::Response

Responses given by the service.

type Error = <S as Service<Request>>::Error

Errors produced by the service.

type Future = <S as Service<Request>>::Future

The future response value.

fn poll_ready(
    &mut self,
    cx: &mut Context<'_>
) -> Poll<Result<(), <S as Service<Request>>::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, request: Request) -> <S as Service<Request>>::Future

Process the request and return the response asynchronously.

impl<S, Item> Sink<Item> for Box<S, Global>where
    S: Sink<Item> + Unpin + ?Sized,

type Error = <S as Sink<Item>>::Error

The type of value produced by the sink when an error occurs.

fn poll_ready(
    self: Pin<&mut Box<S, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), <Box<S, Global> as Sink<Item>>::Error>>

Attempts to prepare the Sink to receive a value.

fn start_send(
    self: Pin<&mut Box<S, Global>>,
    item: Item
) -> Result<(), <Box<S, Global> as Sink<Item>>::Error>

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Poll::Ready(Ok(())).

fn poll_flush(
    self: Pin<&mut Box<S, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), <Box<S, Global> as Sink<Item>>::Error>>

Flush any remaining output from this sink.

fn poll_close(
    self: Pin<&mut Box<S, Global>>,
    cx: &mut Context<'_>
) -> Poll<Result<(), <Box<S, Global> as Sink<Item>>::Error>>

Flush any remaining output and close this sink, if necessary.

impl<T> Source for Box<T, Global>where
    T: Source + ?Sized,

fn register(
    &mut self,
    registry: &Registry,
    token: Token,
    interests: Interest
) -> Result<(), Error>

Register self with the given Registry instance.

fn reregister(
    &mut self,
    registry: &Registry,
    token: Token,
    interests: Interest
) -> Result<(), Error>

Re-register self with the given Registry instance.

fn deregister(&mut self, registry: &Registry) -> Result<(), Error>

Deregister self from the given Registry instance.

impl<S> Stream for Box<S, Global>where
    S: Stream + Unpin + ?Sized,

type Item = <S as Stream>::Item

Values yielded by the stream.

fn poll_next(
    self: Pin<&mut Box<S, Global>>,
    cx: &mut Context<'_>
) -> Poll<Option<<Box<S, Global> as Stream>::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.

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

Returns the bounds on the remaining length of the stream.

impl<S> Subscriber for Box<S, Global>where
    S: Subscriber + ?Sized,

fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest

Registers a new callsite with this subscriber, returning whether or not the subscriber is interested in being notified about the callsite.

fn enabled(&self, metadata: &Metadata<'_>) -> bool

Returns true if a span or event with the specified metadata would be recorded.

fn max_level_hint(&self) -> Option<LevelFilter>

Returns the highest verbosity level that this Subscriber will enable, or None, if the subscriber does not implement level-based filtering or chooses not to implement this method.

fn new_span(&self, span: &Attributes<'_>) -> Id

Visit the construction of a new span, returning a new span ID for the span being constructed.

fn record(&self, span: &Id, values: &Record<'_>)

Record a set of values on a span.

fn record_follows_from(&self, span: &Id, follows: &Id)

Adds an indication that span follows from the span with the id follows.

fn event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded.

fn event(&self, event: &Event<'_>)

Records that an Event has occurred.

fn enter(&self, span: &Id)

Records that a span has been entered.

fn exit(&self, span: &Id)

Records that a span has been exited.

fn clone_span(&self, id: &Id) -> Id

Notifies the subscriber that a span ID has been cloned.

fn try_close(&self, id: Id) -> bool

Notifies the subscriber that a span ID has been dropped, and returns true if there are now 0 IDs that refer to that span.

fn drop_span(&self, id: Id)

👎Deprecated since 0.1.2: use Subscriber::try_close instead

This method is deprecated.

fn current_span(&self) -> Current

Returns a type representing this subscriber’s view of the current span.

unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()>

If self is the same type as the provided TypeId, returns an untyped *const pointer to that type. Otherwise, returns None.

fn on_register_dispatch(&self, subscriber: &Dispatch)

Invoked when this subscriber becomes a Dispatch.

impl<T, const N: usize> TryFrom<Box<[T], Global>> for Box<[T; N], Global>

fn try_from(
    boxed_slice: Box<[T], Global>
) -> Result<Box<[T; N], Global>, <Box<[T; N], Global> as TryFrom<Box<[T], Global>>>::Error>

Attempts to convert a Box<[T]> into a Box<[T; N]>.

The conversion occurs in-place and does not require a new memory allocation.

Errors

Returns the old Box<[T]> in the Err variant if boxed_slice.len() does not equal N.

type Error = Box<[T], Global>

The type returned in the event of a conversion error.

impl<T, const N: usize> TryFrom<Vec<T, Global>> for Box<[T; N], Global>

fn try_from(
    vec: Vec<T, Global>
) -> Result<Box<[T; N], Global>, <Box<[T; N], Global> as TryFrom<Vec<T, Global>>>::Error>

Attempts to convert a Vec<T> into a Box<[T; N]>.

Like Vec::into_boxed_slice, this is in-place if vec.capacity() == N, but will require a reallocation otherwise.

Errors

Returns the original Vec<T> in the Err variant if boxed_slice.len() does not equal N.

Examples

This can be used with vec! to create an array on the heap:

let state: Box<[f32; 100]> = vec![1.0; 100].try_into().unwrap();
assert_eq!(state.len(), 100);

type Error = Vec<T, Global>

The type returned in the event of a conversion error.

impl<T> Value for Box<T, Global>where
    T: Value + ?Sized,

fn record(&self, key: &Field, visitor: &mut dyn Visit)

Visits this value with the given Visitor.

impl<W> Write for Box<W, Global>where
    W: Write + ?Sized,

fn write(&mut self, buf: &[u8]) -> Result<usize, Error>

Write a buffer into this writer, returning how many bytes were written.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn flush(&mut self) -> Result<(), Error>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

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

Writes a formatted string into this writer, returning any error encountered.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn by_ref(&mut self) -> &mut Selfwhere
    Self: Sized,

Creates a “by reference” adapter for this instance of Write.

impl Copy for Global

impl<R> CryptoRng for Box<R, Global>where
    R: CryptoRng + ?Sized,

impl<T, U> DispatchFromDyn<Box<U, Global>> for Box<T, Global>where
    T: Unsize<U> + ?Sized,
    U: ?Sized,