Struct read_with::ReadWith

pub struct ReadWith<F, S> where
    F: FnMut() -> Option<S>,
    S: AsRef<[u8]> + Default,  { /* fields omitted */ }

An object that implements the Read trait

Methods

impl<F, S> ReadWith<F, S> where     F: FnMut() -> Option<S>,     S: AsRef<[u8]> + Default,

pub fn new(f: F) -> Self

Create an object that will read from the given function.

Keeps on reading from f until it returns a None. The function may return anything that can be turned into a &[u8] which includes String and &str.

Trait Implementations

impl<F, S> Read for ReadWith<F, S> where     F: FnMut() -> Option<S>,     S: AsRef<[u8]> + Default,

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.

unsafe fn initializer(&self) -> Initializer

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

Determines if this Reader can work with buffers of uninitialized memory.

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

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

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

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

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

Read the exact number of bytes required to fill buf.

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

Creates a "by reference" adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an [Iterator] over its bytes.

fn chars(self) -> Chars<Self>

Deprecated since 1.27.0

: Use str::from_utf8 instead: https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples

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

the semantics of a partial read/write of where errors happen is currently unclear and may change

Transforms this Read instance to an [Iterator] over [char]s.

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

Creates an adaptor which will chain this stream with another.

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

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