pub struct Take<T> { /* fields omitted */ }
Reader adaptor which limits the bytes read from an underlying reader.
This struct is generally created by calling take
on a reader. Please see the documentation of take
for more details.
impl<T> Take<T>
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pub fn limit(&self) -> u64
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Returns the number of bytes that can be read before this instance will return EOF.
This instance may reach EOF
after reading fewer bytes than indicated by this method if the underlying Read
instance reaches EOF.
use std::io; use std::io::prelude::*; use std::fs::File; let f = File::open("foo.txt")?; // read at most five bytes let handle = f.take(5); println!("limit: {}", handle.limit());
pub fn set_limit(&mut self, limit: u64)
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Sets the number of bytes that can be read before this instance will return EOF. This is the same as constructing a new Take
instance, so the amount of bytes read and the previous limit value don't matter when calling this method.
#![feature(take_set_limit)] use std::io; use std::io::prelude::*; use std::fs::File; let f = File::open("foo.txt")?; // read at most five bytes let mut handle = f.take(5); handle.set_limit(10); assert_eq!(handle.limit(), 10);
pub fn into_inner(self) -> T
Consumes the Take
, returning the wrapped reader.
use std::io; use std::io::prelude::*; use std::fs::File; let mut file = File::open("foo.txt")?; let mut buffer = [0; 5]; let mut handle = file.take(5); handle.read(&mut buffer)?; let file = handle.into_inner();
pub fn get_ref(&self) -> &T
Gets a reference to the underlying reader.
use std::io; use std::io::prelude::*; use std::fs::File; let mut file = File::open("foo.txt")?; let mut buffer = [0; 5]; let mut handle = file.take(5); handle.read(&mut buffer)?; let file = handle.get_ref();
pub fn get_mut(&mut self) -> &mut T
Gets a mutable reference to the underlying reader.
Care should be taken to avoid modifying the internal I/O state of the underlying reader as doing so may corrupt the internal limit of this Take
.
use std::io; use std::io::prelude::*; use std::fs::File; let mut file = File::open("foo.txt")?; let mut buffer = [0; 5]; let mut handle = file.take(5); handle.read(&mut buffer)?; let file = handle.get_mut();
impl<T:Â Debug> Debug for Take<T>
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl<T:Â Read> Read for Take<T>
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fn read(&mut self, buf: &mut [u8]) -> Result<usize>
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Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
unsafe fn initializer(&self) -> Initializer
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Determines if this Read
er can work with buffers of uninitialized memory. Read more
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>
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Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_to_string(&mut self, buf: &mut String) -> Result<usize>
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Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_exact(&mut self, buf: &mut [u8]) -> Result<()>
Read the exact number of bytes required to fill buf
. Read more
fn by_ref(&mut self) -> &mut Self where
    Self: Sized,Â
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Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self> where
    Self: Sized,Â
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Transforms this Read
instance to an [Iterator
] over its bytes. Read more
fn chars(self) -> Chars<Self> where
    Self: Sized,Â
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Transforms this Read
instance to an [Iterator
] over [char
]s. Read more
fn chain<R:Â Read>(self, next: R) -> Chain<Self, R> where
    Self: Sized,Â
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Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self> where
    Self: Sized,Â
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Creates an adaptor which will read at most limit
bytes from it. Read more
impl<T:Â BufRead> BufRead for Take<T>
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fn fill_buf(&mut self) -> Result<&[u8]>
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Fills the internal buffer of this object, returning the buffer contents. Read more
fn consume(&mut self, amt: usize)
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Tells this buffer that amt
bytes have been consumed from the buffer, so they should no longer be returned in calls to read
. Read more
fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> Result<usize>
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Read all bytes into buf
until the delimiter byte
or EOF is reached. Read more
fn read_line(&mut self, buf: &mut String) -> Result<usize>
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Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. Read more
fn split(self, byte: u8) -> Split<Self> where
    Self: Sized,Â
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Returns an iterator over the contents of this reader split on the byte byte
. Read more
fn lines(self) -> Lines<Self> where
    Self: Sized,Â
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Returns an iterator over the lines of this reader. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/io/struct.Take.html