pub struct AssertAsync<T>(_);
Expand description

Asserts that a type implementing std::io traits can be used as an async type.

The underlying I/O handle should never block nor return the ErrorKind::WouldBlock error. This is usually the case for in-memory buffered I/O.

Examples

use futures_lite::io::{AssertAsync, AsyncReadExt};

let reader: &[u8] = b"hello";

let mut async_reader = AssertAsync::new(reader);
let mut contents = String::new();

// This line works in async manner - note that there is await:
async_reader.read_to_string(&mut contents).await?;

Implementations

Wraps an I/O handle implementing std::io traits.

Examples
use futures_lite::io::AssertAsync;

let reader: &[u8] = b"hello";

let async_reader = AssertAsync::new(reader);

Gets a reference to the inner I/O handle.

Examples
use futures_lite::io::AssertAsync;

let reader: &[u8] = b"hello";

let async_reader = AssertAsync::new(reader);
let r = async_reader.get_ref();

Gets a mutable reference to the inner I/O handle.

Examples
use futures_lite::io::AssertAsync;

let reader: &[u8] = b"hello";

let mut async_reader = AssertAsync::new(reader);
let r = async_reader.get_mut();

Extracts the inner I/O handle.

Examples
use futures_lite::io::AssertAsync;

let reader: &[u8] = b"hello";

let async_reader = AssertAsync::new(reader);
let inner = async_reader.into_inner();

Trait Implementations

Attempt to read from the AsyncRead into buf. Read more

Attempt to read from the AsyncRead into bufs using vectored IO operations. Read more

Attempt to seek to an offset, in bytes, in a stream. Read more

Attempt to write bytes from buf into the object. Read more

Attempt to write bytes from bufs into the object using vectored IO operations. Read more

Attempt to flush the object, ensuring that any buffered data reach their destination. Read more

Attempt to close the object. Read more

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Reads some bytes from the byte stream. Read more

Like read(), except it reads into a slice of buffers. Read more

Reads the entire contents and appends them to a Vec. Read more

Reads the entire contents and appends them to a String. Read more

Reads the exact number of bytes required to fill buf. Read more

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

Converts this AsyncRead into a Stream of bytes. Read more

Creates an adapter which will chain this stream with another. Read more

Boxes the reader and changes its type to dyn AsyncRead + Send + 'a. Read more

Seeks to a new position in a byte stream. Read more

Writes some bytes into the byte stream. Read more

Like write(), except that it writes a slice of buffers. Read more

Writes an entire buffer into the byte stream. Read more

Flushes the stream to ensure that all buffered contents reach their destination. Read more

Closes the writer. Read more

Boxes the writer and changes its type to dyn AsyncWrite + Send + 'a. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.