# Struct bytes::buf::Chain

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    pub struct Chain<T, U> { /* private fields */ }

Expand description

A `Chain` sequences two buffers.

`Chain` is an adapter that links two underlying buffers and provides a continuous view across both buffers. It is able to sequence either immutable buffers (`Buf` values) or mutable buffers (`BufMut` values).

This struct is generally created by calling `Buf::chain`. Please see that function’s documentation for more detail.

## §Examples

    use bytes::{Bytes, Buf};

    let mut buf = (&b"hello "[..])
        .chain(&b"world"[..]);

    let full: Bytes = buf.copy_to_bytes(11);
    assert_eq!(full[..], b"hello world"[..]);

## Implementations§

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### impl<T, U> Chain<T, U>

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#### pub fn first_ref(&self) -> &T

Gets a reference to the first underlying `Buf`.

##### §Examples

    use bytes::Buf;

    let buf = (&b"hello"[..])
        .chain(&b"world"[..]);

    assert_eq!(buf.first_ref()[..], b"hello"[..]);

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#### pub fn first_mut(&mut self) -> &mut T

Gets a mutable reference to the first underlying `Buf`.

##### §Examples

    use bytes::Buf;

    let mut buf = (&b"hello"[..])
        .chain(&b"world"[..]);

    buf.first_mut().advance(1);

    let full = buf.copy_to_bytes(9);
    assert_eq!(full, b"elloworld"[..]);

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#### pub fn last_ref(&self) -> &U

Gets a reference to the last underlying `Buf`.

##### §Examples

    use bytes::Buf;

    let buf = (&b"hello"[..])
        .chain(&b"world"[..]);

    assert_eq!(buf.last_ref()[..], b"world"[..]);

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#### pub fn last_mut(&mut self) -> &mut U

Gets a mutable reference to the last underlying `Buf`.

##### §Examples

    use bytes::Buf;

    let mut buf = (&b"hello "[..])
        .chain(&b"world"[..]);

    buf.last_mut().advance(1);

    let full = buf.copy_to_bytes(10);
    assert_eq!(full, b"hello orld"[..]);

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#### pub fn into_inner(self) -> (T, U)

Consumes this `Chain`, returning the underlying values.

##### §Examples

    use bytes::Buf;

    let chain = (&b"hello"[..])
        .chain(&b"world"[..]);

    let (first, last) = chain.into_inner();
    assert_eq!(first[..], b"hello"[..]);
    assert_eq!(last[..], b"world"[..]);

## Trait Implementations§

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### impl<T, U> Buf for Chain<T, U>
where T: Buf, U: Buf,

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#### fn remaining(&self) -> usize

Returns the number of bytes between the current position and the end of the buffer. Read more
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#### 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 a shorter slice (this allows non-continuous internal representation). Read more
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#### fn advance(&mut self, cnt: usize)

Advance the internal cursor of the Buf Read more
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#### fn chunks_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize

Available on crate feature `std` only.
Fills `dst` with potentially multiple slices starting at `self`’s current position. Read more
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#### fn copy_to_bytes(&mut self, len: usize) -> Bytes

Consumes `len` bytes inside self and returns new instance of `Bytes` with this data. Read more
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#### fn has_remaining(&self) -> bool

Returns true if there are any more bytes to consume Read more
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#### fn copy_to_slice(&mut self, dst: &mut [u8])

Copies bytes from `self` into `dst`. Read more
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#### fn get_u8(&mut self) -> u8

Gets an unsigned 8 bit integer from `self`. Read more
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#### fn get_i8(&mut self) -> i8

Gets a signed 8 bit integer from `self`. Read more
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#### fn get_u16(&mut self) -> u16

Gets an unsigned 16 bit integer from `self` in big-endian byte order. Read more
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#### fn get_u16_le(&mut self) -> u16

Gets an unsigned 16 bit integer from `self` in little-endian byte order. Read more
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#### fn get_u16_ne(&mut self) -> u16

Gets an unsigned 16 bit integer from `self` in native-endian byte order. Read more
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#### fn get_i16(&mut self) -> i16

Gets a signed 16 bit integer from `self` in big-endian byte order. Read more
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#### fn get_i16_le(&mut self) -> i16

Gets a signed 16 bit integer from `self` in little-endian byte order. Read more
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#### fn get_i16_ne(&mut self) -> i16

Gets a signed 16 bit integer from `self` in native-endian byte order. Read more
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#### fn get_u32(&mut self) -> u32

Gets an unsigned 32 bit integer from `self` in the big-endian byte order. Read more
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#### fn get_u32_le(&mut self) -> u32

Gets an unsigned 32 bit integer from `self` in the little-endian byte order. Read more
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#### fn get_u32_ne(&mut self) -> u32

Gets an unsigned 32 bit integer from `self` in native-endian byte order. Read more
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#### fn get_i32(&mut self) -> i32

Gets a signed 32 bit integer from `self` in big-endian byte order. Read more
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#### fn get_i32_le(&mut self) -> i32

Gets a signed 32 bit integer from `self` in little-endian byte order. Read more
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#### fn get_i32_ne(&mut self) -> i32

Gets a signed 32 bit integer from `self` in native-endian byte order. Read more
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#### fn get_u64(&mut self) -> u64

Gets an unsigned 64 bit integer from `self` in big-endian byte order. Read more
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#### fn get_u64_le(&mut self) -> u64

Gets an unsigned 64 bit integer from `self` in little-endian byte order. Read more
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#### fn get_u64_ne(&mut self) -> u64

Gets an unsigned 64 bit integer from `self` in native-endian byte order. Read more
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#### fn get_i64(&mut self) -> i64

Gets a signed 64 bit integer from `self` in big-endian byte order. Read more
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#### fn get_i64_le(&mut self) -> i64

Gets a signed 64 bit integer from `self` in little-endian byte order. Read more
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#### fn get_i64_ne(&mut self) -> i64

Gets a signed 64 bit integer from `self` in native-endian byte order. Read more
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#### fn get_u128(&mut self) -> u128

Gets an unsigned 128 bit integer from `self` in big-endian byte order. Read more
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#### fn get_u128_le(&mut self) -> u128

Gets an unsigned 128 bit integer from `self` in little-endian byte order. Read more
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#### fn get_u128_ne(&mut self) -> u128

Gets an unsigned 128 bit integer from `self` in native-endian byte order. Read more
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#### fn get_i128(&mut self) -> i128

Gets a signed 128 bit integer from `self` in big-endian byte order. Read more
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#### fn get_i128_le(&mut self) -> i128

Gets a signed 128 bit integer from `self` in little-endian byte order. Read more
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#### fn get_i128_ne(&mut self) -> i128

Gets a signed 128 bit integer from `self` in native-endian byte order. Read more
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#### fn get_uint(&mut self, nbytes: usize) -> u64

Gets an unsigned n-byte integer from `self` in big-endian byte order. Read more
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#### fn get_uint_le(&mut self, nbytes: usize) -> u64

Gets an unsigned n-byte integer from `self` in little-endian byte order. Read more
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#### fn get_uint_ne(&mut self, nbytes: usize) -> u64

Gets an unsigned n-byte integer from `self` in native-endian byte order. Read more
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#### fn get_int(&mut self, nbytes: usize) -> i64

Gets a signed n-byte integer from `self` in big-endian byte order. Read more
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#### fn get_int_le(&mut self, nbytes: usize) -> i64

Gets a signed n-byte integer from `self` in little-endian byte order. Read more
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#### fn get_int_ne(&mut self, nbytes: usize) -> i64

Gets a signed n-byte integer from `self` in native-endian byte order. Read more
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#### fn get_f32(&mut self) -> f32

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in big-endian byte order. Read more
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#### fn get_f32_le(&mut self) -> f32

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in little-endian byte order. Read more
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#### fn get_f32_ne(&mut self) -> f32

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in native-endian byte order. Read more
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#### fn get_f64(&mut self) -> f64

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in big-endian byte order. Read more
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#### fn get_f64_le(&mut self) -> f64

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in little-endian byte order. Read more
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#### fn get_f64_ne(&mut self) -> f64

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in native-endian byte order. Read more
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#### fn try_copy_to_slice(&mut self, dst: &mut [u8]) -> Result<(), TryGetError>

Copies bytes from `self` into `dst`. Read more
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#### fn try_get_u8(&mut self) -> Result<u8, TryGetError>

Gets an unsigned 8 bit integer from `self`. Read more
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#### fn try_get_i8(&mut self) -> Result<i8, TryGetError>

Gets a signed 8 bit integer from `self`. Read more
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#### fn try_get_u16(&mut self) -> Result<u16, TryGetError>

Gets an unsigned 16 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_u16_le(&mut self) -> Result<u16, TryGetError>

Gets an unsigned 16 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_u16_ne(&mut self) -> Result<u16, TryGetError>

Gets an unsigned 16 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_i16(&mut self) -> Result<i16, TryGetError>

Gets a signed 16 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_i16_le(&mut self) -> Result<i16, TryGetError>

Gets an signed 16 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_i16_ne(&mut self) -> Result<i16, TryGetError>

Gets a signed 16 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_u32(&mut self) -> Result<u32, TryGetError>

Gets an unsigned 32 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_u32_le(&mut self) -> Result<u32, TryGetError>

Gets an unsigned 32 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_u32_ne(&mut self) -> Result<u32, TryGetError>

Gets an unsigned 32 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_i32(&mut self) -> Result<i32, TryGetError>

Gets a signed 32 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_i32_le(&mut self) -> Result<i32, TryGetError>

Gets a signed 32 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_i32_ne(&mut self) -> Result<i32, TryGetError>

Gets a signed 32 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_u64(&mut self) -> Result<u64, TryGetError>

Gets an unsigned 64 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_u64_le(&mut self) -> Result<u64, TryGetError>

Gets an unsigned 64 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_u64_ne(&mut self) -> Result<u64, TryGetError>

Gets an unsigned 64 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_i64(&mut self) -> Result<i64, TryGetError>

Gets a signed 64 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_i64_le(&mut self) -> Result<i64, TryGetError>

Gets a signed 64 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_i64_ne(&mut self) -> Result<i64, TryGetError>

Gets a signed 64 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_u128(&mut self) -> Result<u128, TryGetError>

Gets an unsigned 128 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_u128_le(&mut self) -> Result<u128, TryGetError>

Gets an unsigned 128 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_u128_ne(&mut self) -> Result<u128, TryGetError>

Gets an unsigned 128 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_i128(&mut self) -> Result<i128, TryGetError>

Gets a signed 128 bit integer from `self` in big-endian byte order. Read more
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#### fn try_get_i128_le(&mut self) -> Result<i128, TryGetError>

Gets a signed 128 bit integer from `self` in little-endian byte order. Read more
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#### fn try_get_i128_ne(&mut self) -> Result<i128, TryGetError>

Gets a signed 128 bit integer from `self` in native-endian byte order. Read more
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#### fn try_get_uint(&mut self, nbytes: usize) -> Result<u64, TryGetError>

Gets an unsigned n-byte integer from `self` in big-endian byte order. Read more
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#### fn try_get_uint_le(&mut self, nbytes: usize) -> Result<u64, TryGetError>

Gets an unsigned n-byte integer from `self` in little-endian byte order. Read more
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#### fn try_get_uint_ne(&mut self, nbytes: usize) -> Result<u64, TryGetError>

Gets an unsigned n-byte integer from `self` in native-endian byte order. Read more
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#### fn try_get_int(&mut self, nbytes: usize) -> Result<i64, TryGetError>

Gets a signed n-byte integer from `self` in big-endian byte order. Read more
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#### fn try_get_int_le(&mut self, nbytes: usize) -> Result<i64, TryGetError>

Gets a signed n-byte integer from `self` in little-endian byte order. Read more
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#### fn try_get_int_ne(&mut self, nbytes: usize) -> Result<i64, TryGetError>

Gets a signed n-byte integer from `self` in native-endian byte order. Read more
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#### fn try_get_f32(&mut self) -> Result<f32, TryGetError>

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in big-endian byte order. Read more
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#### fn try_get_f32_le(&mut self) -> Result<f32, TryGetError>

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in little-endian byte order. Read more
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#### fn try_get_f32_ne(&mut self) -> Result<f32, TryGetError>

Gets an IEEE754 single-precision (4 bytes) floating point number from `self` in native-endian byte order. Read more
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#### fn try_get_f64(&mut self) -> Result<f64, TryGetError>

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in big-endian byte order. Read more
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#### fn try_get_f64_le(&mut self) -> Result<f64, TryGetError>

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in little-endian byte order. Read more
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#### fn try_get_f64_ne(&mut self) -> Result<f64, TryGetError>

Gets an IEEE754 double-precision (8 bytes) floating point number from `self` in native-endian byte order. Read more
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#### fn take(self, limit: usize) -> Take<Self>
where Self: Sized,

Creates an adaptor which will read at most `limit` bytes from `self`. Read more
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#### fn chain<U: Buf>(self, next: U) -> Chain<Self, U>
where Self: Sized,

Creates an adaptor which will chain this buffer with another. Read more
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#### fn reader(self) -> Reader<Self> ⓘ
where Self: Sized,

Available on crate feature `std` only.
Creates an adaptor which implements the `Read` trait for `self`. Read more
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### impl<T, U> BufMut for Chain<T, U>
where T: BufMut, U: BufMut,

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#### 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. Read more
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#### 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). Read more
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#### unsafe fn advance_mut(&mut self, cnt: usize)

Advance the internal cursor of the BufMut Read more
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#### fn has_remaining_mut(&self) -> bool

Returns true if there is space in `self` for more bytes. Read more
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#### fn put<T: Buf>(&mut self, src: T)
where Self: Sized,

Transfer bytes into `self` from `src` and advance the cursor by the number of bytes written. Read more
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#### fn put_slice(&mut self, src: &[u8])

Transfer bytes into `self` from `src` and advance the cursor by the number of bytes written. Read more
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#### fn put_bytes(&mut self, val: u8, cnt: usize)

Put `cnt` bytes `val` into `self`. Read more
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#### fn put_u8(&mut self, n: u8)

Writes an unsigned 8 bit integer to `self`. Read more
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#### fn put_i8(&mut self, n: i8)

Writes a signed 8 bit integer to `self`. Read more
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#### fn put_u16(&mut self, n: u16)

Writes an unsigned 16 bit integer to `self` in big-endian byte order. Read more
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#### fn put_u16_le(&mut self, n: u16)

Writes an unsigned 16 bit integer to `self` in little-endian byte order. Read more
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#### fn put_u16_ne(&mut self, n: u16)

Writes an unsigned 16 bit integer to `self` in native-endian byte order. Read more
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#### fn put_i16(&mut self, n: i16)

Writes a signed 16 bit integer to `self` in big-endian byte order. Read more
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#### fn put_i16_le(&mut self, n: i16)

Writes a signed 16 bit integer to `self` in little-endian byte order. Read more
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#### fn put_i16_ne(&mut self, n: i16)

Writes a signed 16 bit integer to `self` in native-endian byte order. Read more
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#### fn put_u32(&mut self, n: u32)

Writes an unsigned 32 bit integer to `self` in big-endian byte order. Read more
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#### fn put_u32_le(&mut self, n: u32)

Writes an unsigned 32 bit integer to `self` in little-endian byte order. Read more
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#### fn put_u32_ne(&mut self, n: u32)

Writes an unsigned 32 bit integer to `self` in native-endian byte order. Read more
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#### fn put_i32(&mut self, n: i32)

Writes a signed 32 bit integer to `self` in big-endian byte order. Read more
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#### fn put_i32_le(&mut self, n: i32)

Writes a signed 32 bit integer to `self` in little-endian byte order. Read more
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#### fn put_i32_ne(&mut self, n: i32)

Writes a signed 32 bit integer to `self` in native-endian byte order. Read more
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#### fn put_u64(&mut self, n: u64)

Writes an unsigned 64 bit integer to `self` in the big-endian byte order. Read more
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#### fn put_u64_le(&mut self, n: u64)

Writes an unsigned 64 bit integer to `self` in little-endian byte order. Read more
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#### fn put_u64_ne(&mut self, n: u64)

Writes an unsigned 64 bit integer to `self` in native-endian byte order. Read more
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#### fn put_i64(&mut self, n: i64)

Writes a signed 64 bit integer to `self` in the big-endian byte order. Read more
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#### fn put_i64_le(&mut self, n: i64)

Writes a signed 64 bit integer to `self` in little-endian byte order. Read more
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#### fn put_i64_ne(&mut self, n: i64)

Writes a signed 64 bit integer to `self` in native-endian byte order. Read more
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#### fn put_u128(&mut self, n: u128)

Writes an unsigned 128 bit integer to `self` in the big-endian byte order. Read more
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#### fn put_u128_le(&mut self, n: u128)

Writes an unsigned 128 bit integer to `self` in little-endian byte order. Read more
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#### fn put_u128_ne(&mut self, n: u128)

Writes an unsigned 128 bit integer to `self` in native-endian byte order. Read more
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#### fn put_i128(&mut self, n: i128)

Writes a signed 128 bit integer to `self` in the big-endian byte order. Read more
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#### fn put_i128_le(&mut self, n: i128)

Writes a signed 128 bit integer to `self` in little-endian byte order. Read more
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#### fn put_i128_ne(&mut self, n: i128)

Writes a signed 128 bit integer to `self` in native-endian byte order. Read more
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#### fn put_uint(&mut self, n: u64, nbytes: usize)

Writes an unsigned n-byte integer to `self` in big-endian byte order. Read more
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#### fn put_uint_le(&mut self, n: u64, nbytes: usize)

Writes an unsigned n-byte integer to `self` in the little-endian byte order. Read more
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#### fn put_uint_ne(&mut self, n: u64, nbytes: usize)

Writes an unsigned n-byte integer to `self` in the native-endian byte order. Read more
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#### fn put_int(&mut self, n: i64, nbytes: usize)

Writes low `nbytes` of a signed integer to `self` in big-endian byte order. Read more
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#### fn put_int_le(&mut self, n: i64, nbytes: usize)

Writes low `nbytes` of a signed integer to `self` in little-endian byte order. Read more
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#### fn put_int_ne(&mut self, n: i64, nbytes: usize)

Writes low `nbytes` of a signed integer to `self` in native-endian byte order. Read more
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#### fn put_f32(&mut self, n: f32)

Writes an IEEE754 single-precision (4 bytes) floating point number to `self` in big-endian byte order. Read more
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#### 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. Read more
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#### fn put_f32_ne(&mut self, n: f32)

Writes an IEEE754 single-precision (4 bytes) floating point number to `self` in native-endian byte order. Read more
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#### fn put_f64(&mut self, n: f64)

Writes an IEEE754 double-precision (8 bytes) floating point number to `self` in big-endian byte order. Read more
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#### 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. Read more
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#### fn put_f64_ne(&mut self, n: f64)

Writes an IEEE754 double-precision (8 bytes) floating point number to `self` in native-endian byte order. Read more
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#### fn limit(self, limit: usize) -> Limit<Self>
where Self: Sized,

Creates an adaptor which can write at most `limit` bytes to `self`. Read more
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#### fn writer(self) -> Writer<Self> ⓘ
where Self: Sized,

Available on crate feature `std` only.
Creates an adaptor which implements the `Write` trait for `self`. Read more
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#### fn chain_mut<U: BufMut>(self, next: U) -> Chain<Self, U>
where Self: Sized,

Creates an adapter which will chain this buffer with another. Read more
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### impl<T: Debug, U: Debug> Debug for Chain<T, U>

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

Formats the value using the given formatter. Read more
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### impl<T, U> IntoIterator for Chain<T, U>
where T: Buf, U: Buf,

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#### type Item = u8

The type of the elements being iterated over.
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#### type IntoIter = IntoIter<Chain<T, U>>

Which kind of iterator are we turning this into?
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#### fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more

## Auto Trait Implementations§

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### impl<T, U> Freeze for Chain<T, U>
where T: Freeze, U: Freeze,

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### impl<T, U> RefUnwindSafe for Chain<T, U>
where T: RefUnwindSafe, U: RefUnwindSafe,

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### impl<T, U> Send for Chain<T, U>
where T: Send, U: Send,

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### impl<T, U> Sync for Chain<T, U>
where T: Sync, U: Sync,

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### impl<T, U> Unpin for Chain<T, U>
where T: Unpin, U: Unpin,

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### impl<T, U> UnwindSafe for Chain<T, U>
where T: UnwindSafe, U: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

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

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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.