结构体 Writer 

pub struct Writer<B> { /* private fields */ }

一个为内部值实现 io::Write 的 BufMut 适配器。

此结构体通常通过对 BufMut 调用 writer() 创建。详情请参阅 writer() 的文档。

实现

impl<B: BufMut> Writer<B>

pub fn get_ref(&self) -> &B

获取对底层 BufMut 的引用。

不建议直接写入底层 BufMut。

示例

use bytes::BufMut;

let buf = Vec::with_capacity(1024).writer();

assert_eq!(1024, buf.get_ref().capacity());

pub fn get_mut(&mut self) -> &mut B

获取对底层 BufMut 的可变引用。

不建议直接写入底层 BufMut。

示例

use bytes::BufMut;

let mut buf = vec![].writer();

buf.get_mut().reserve(1024);

assert_eq!(1024, buf.get_ref().capacity());

pub fn into_inner(self) -> B

消耗此 Writer，返回底层的值。

示例

use bytes::BufMut;
use std::io;

let mut buf = vec![].writer();
let mut src = &b"hello world"[..];

io::copy(&mut src, &mut buf).unwrap();

let buf = buf.into_inner();
assert_eq!(*buf, b"hello world"[..]);

Trait 实现

impl<B: Debug> Debug for Writer<B>

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

使用给定的格式化器格式化此值。 更多信息

impl<B: BufMut + Sized> Write for Writer<B>

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

Writes a buffer into this writer, returning how many bytes were written. 更多信息

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

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. 更多信息

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

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

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. 更多信息

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

Attempts to write an entire buffer into this writer. 更多信息

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. 更多信息

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

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

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

where Self: Sized,

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