Struct MultiReaders 

pub struct MultiReaders<T> { /* private fields */ }

A structure that manages multiple readers, allowing sequential or concurrent access to a collection of inner readers.

Implementations

impl<T> MultiReaders<T>

pub fn new<I: Iterator<Item = T> + 'static>(values: I) -> Self

Creates a new MultiReaders instance from an iterator of values.

impl<T: IntoIterator<Item = E>, E> MultiReaders<T>

pub fn flatten(self) -> MultiReaders<E>

Creates a new MultiReaders instance by flattening the nested structure of the current instance.

This method transforms the nested structure of the MultiReaders into a single-level structure by applying a flat_map operation on the inner elements.

Panics

This method will panic if it is called after the first read operation. It is intended to be used only during the initialization phase of the MultiReaders.

Examples

 
use std::io::{Cursor, Read};
use multi_readers::{open, MultiReaders};
 
let hello = "hello";
let world = "world";
let none = "none";
let my_open = |s: &'static str | {
    if s == "none" {
       None
   } else {
      Some(Cursor::new(s))
  }
};
let readers: MultiReaders<Option<Cursor<&str>>> = open!(my_open, [hello, none, world]);
let mut readers: MultiReaders<Cursor<&str>> = readers.flatten();
let mut buf = String::new();
readers.read_to_string(&mut buf).unwrap();
assert_eq!(&buf, "helloworld");

Trait Implementations

impl<T: Read> Read for MultiReaders<T>

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

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

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

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

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Reads all bytes until EOF in this source, appending them to buf.

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

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

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

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

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

Reads the exact number of bytes required to fill cursor.

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

where Self: Sized,

Creates a “by reference” adapter for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

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

fn read_array<const N: usize>(&mut self) -> Result<[u8; N], Error>

where Self: Sized,

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

Read and return a fixed array of bytes from this source.

impl<T: Seek> Seek for MultiReaders<T>

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

Seek to an offset, in bytes, in a stream.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

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

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

Seeks relative to the current position.