[][src]Struct df_st_core::bufreader::BufReader

pub struct BufReader<R, T> { /* fields omitted */ }

Implementations

impl<R: Read, T> BufReader<R, T>[src]

pub fn new(inner: R, progress: Progress<T>) -> BufReader<R, T>

Notable traits for BufReader<R, T>

impl<R: Read, T: ProgressUpdater> Read for BufReader<R, T>
[src]

Creates a new BufReader<R> with a default buffer capacity. The default is currently 8 KB, but may change in the future.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::open("log.txt")?;
    let reader = BufReader::new(f);
    Ok(())
}

pub fn with_capacity(
    capacity: usize,
    inner: R,
    progress: Progress<T>
) -> BufReader<R, T>

Notable traits for BufReader<R, T>

impl<R: Read, T: ProgressUpdater> Read for BufReader<R, T>
[src]

impl<R, T> BufReader<R, T>[src]

pub fn get_ref(&self) -> &R[src]

Gets a reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f1 = File::open("log.txt")?;
    let reader = BufReader::new(f1);

    let f2 = reader.get_ref();
    Ok(())
}

pub fn get_mut(&mut self) -> &mut R[src]

Gets a mutable reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f1 = File::open("log.txt")?;
    let mut reader = BufReader::new(f1);

    let f2 = reader.get_mut();
    Ok(())
}

pub fn buffer(&self) -> &[u8][src]

Returns a reference to the internally buffered data.

Unlike fill_buf, this will not attempt to fill the buffer if it is empty.

Examples

use std::io::{BufReader, BufRead};
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::open("log.txt")?;
    let mut reader = BufReader::new(f);
    assert!(reader.buffer().is_empty());

    if reader.fill_buf()?.len() > 0 {
        assert!(!reader.buffer().is_empty());
    }
    Ok(())
}

pub fn capacity(&self) -> usize[src]

Returns the number of bytes the internal buffer can hold at once.

Examples

#![feature(buffered_io_capacity)]
use std::io::{BufReader, BufRead};
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::open("log.txt")?;
    let mut reader = BufReader::new(f);

    let capacity = reader.capacity();
    let buffer = reader.fill_buf()?;
    assert!(buffer.len() <= capacity);
    Ok(())
}

pub fn into_inner(self) -> R[src]

Unwraps this BufReader<R>, returning the underlying reader.

Note that any leftover data in the internal buffer is lost. Therefore, a following read from the underlying reader may lead to data loss.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f1 = File::open("log.txt")?;
    let reader = BufReader::new(f1);

    let f2 = reader.into_inner();
    Ok(())
}

Trait Implementations

impl<R: Read, T: ProgressUpdater> BufRead for BufReader<R, T>[src]

impl<R, T> Debug for BufReader<R, T> where
    R: Debug
[src]

impl<R: Read, T: ProgressUpdater> Read for BufReader<R, T>[src]

impl<R: Seek, T> Seek for BufReader<R, T>[src]

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

Seek to an offset, in bytes, in the underlying reader.

The position used for seeking with SeekFrom::Current(_) is the position the underlying reader would be at if the BufReader<R> had no internal buffer.

Seeking always discards the internal buffer, even if the seek position would otherwise fall within it. This guarantees that calling .into_inner() immediately after a seek yields the underlying reader at the same position.

To seek without discarding the internal buffer, use BufReader::seek_relative.

See std::io::Seek for more details.

Note: In the edge case where you're seeking with SeekFrom::Current(n) where n minus the internal buffer length overflows an i64, two seeks will be performed instead of one. If the second seek returns Err, the underlying reader will be left at the same position it would have if you called seek with SeekFrom::Current(0).

Auto Trait Implementations

impl<R, T> RefUnwindSafe for BufReader<R, T> where
    R: RefUnwindSafe,
    T: RefUnwindSafe

impl<R, T> Send for BufReader<R, T> where
    R: Send,
    T: Send

impl<R, T> Sync for BufReader<R, T> where
    R: Sync,
    T: Sync

impl<R, T> Unpin for BufReader<R, T> where
    R: Unpin,
    T: Unpin

impl<R, T> UnwindSafe for BufReader<R, T> where
    R: UnwindSafe,
    T: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.