fn read_while<P>(&mut self, buf: &mut Vec<u8>, mut predicate: P) -> io::Result<usize>
    where
        P: FnMut(u8) -> bool,
    {
        let mut read = 0;
        let mut inner_read = 0;

        'outer: loop {
            let available = match self.fill_buf() {
                Ok(n) => n,
                Err(ref e) if e.kind() == ErrorKind::Interrupted => continue,
                Err(e) => {
                    self.consume(read);
                    return Err(e);
                }
            };
            if available.len() == 0 {
                break;
            }

            for byte in available.bytes() {
                let byte = byte?;
                if predicate(byte) {
                    buf.extend_from_slice(&[byte]);
                    inner_read += 1;
                    read += 1;
                } else {
                    break 'outer;
                }
            }
            self.consume(inner_read);
            inner_read = 0;
        }
        self.consume(inner_read);

        Ok(read)
    }
/// Read bytes based on a predicate.
///
/// `read_while` takes a predicate as an argument.
/// It will call this on each byte, and copy it to the slice if the
/// predicate evaluates to `true`. Returns the amount of bytes read.
///
/// # Errors
///
/// If this function encounters an error of the kind
/// `ErrorKind::Interrupted` then the error is ignored and the operation
/// will continue.
///
/// If any other read error is encountered then this function immediately
/// returns. Any bytes which have already been read will be appended to
/// `buf`.
///
/// # Examples
///
/// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In
/// this example, we use [`Cursor`] to read bytes in a byte slice until
/// we encounter a hyphen:
///
/// ```
/// use std::io::{self, BufRead};
/// use omnom::prelude::*;
///
/// let mut cursor = io::Cursor::new(b"lorem-ipsum");
/// let mut buf = vec![];
///
/// let num_bytes = cursor.read_while(&mut buf, |b| b != b'-')
///     .expect("reading from cursor won't fail");
/// assert_eq!(buf, b"lorem");
/// ```
Read bytes based on a predicate.
`read_while` takes a predicate as an argument.
It will call this on each byte, and copy it to the slice if the
predicate evaluates to `true`. Returns the amount of bytes read.
Read bytes based on a predicate . ` read_while ` takes a predicate as an argument . It will call this on each byte and copy it to the slice if the predicate evaluates to ` true ` . Returns the amount of bytes read .
fn read_while<P>(&mut self, buf: &mut Vec<u8>, mut predicate: P) -> io::Result<usize>
    where
        P: FnMut(u8) -> bool,
    {
        let mut read = 0;
        let mut inner_read = 0;
        'outer: loop {
            let available = match self.fill_buf() {
                Ok(n) => n,
                Err(ref e) if e.kind() == ErrorKind::Interrupted => continue,
                Err(e) => {
                    self.consume(read);
                    return Err(e);
                }
            };
            if available.len() == 0 {
                break;
            }
            for byte in available.bytes() {
                let byte = byte?;
                if predicate(byte) {
                    buf.extend_from_slice(&[byte]);
                    inner_read += 1;
                    read += 1;
                } else {
                    break 'outer;
                }
            }
            self.consume(inner_read);
            inner_read = 0;
        }
        self.consume(inner_read);
        Ok(read)
    }
fn read_while < P > ( & mut self , buf : & mut Vec < u8 > , mut predicate : P ) -> io :: Result < usize > where P : FnMut ( u8 ) -> bool , { let mut read = 0 ; let mut inner_read = 0 ; ' outer : loop { let available = match self . fill_buf ( ) { Ok ( n ) => n , Err ( ref e ) if e . kind ( ) == ErrorKind :: Interrupted => continue , Err ( e ) => { self . consume ( read ) ; return Err ( e ) ; } } ; if available . len ( ) == 0 { break ; } for byte in available . bytes ( ) { let byte = byte ? ; if predicate ( byte ) { buf . extend_from_slice ( & [ byte ] ) ; inner_read += 1 ; read += 1 ; } else { break ' outer ; } } self . consume ( inner_read ) ; inner_read = 0 ; } self . consume ( inner_read ) ; Ok ( read ) }
Read bytes based on a predicate.
Read bytes based on a predicate .
&mut self
buf
&mut Vec<u8>
predicate
P
&mut self
buf
&mut Vec<u8>
predicate
P
errors
If this function encounters an error of the kind
`ErrorKind::Interrupted` then the error is ignored and the operation
will continue.

If any other read error is encountered then this function immediately
returns. Any bytes which have already been read will be appended to
`buf`.
If this function encounters an error of the kind ` ErrorKind :: Interrupted ` then the error is ignored and the operation will continue . If any other read error is encountered then this function immediately returns . Any bytes which have already been read will be appended to ` buf ` .
examples
[`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In
this example, we use [`Cursor`] to read bytes in a byte slice until
we encounter a hyphen.

```
use std::io::{self, BufRead};
use omnom::prelude::*.

let mut cursor = io::Cursor::new(b"lorem-ipsum");
let mut buf = vec![].

let num_bytes = cursor.read_while(&mut buf, |b| b != b'-')
.expect("reading from cursor won't fail");
assert_eq!(buf, b"lorem");
```
[ ` std :: io :: Cursor ` ] [ ` Cursor ` ] is a type that implements ` BufRead ` . In this example we use [ ` Cursor ` ] to read bytes in a byte slice until we encounter a hyphen . ` ` ` use std :: io :: { self BufRead } ; use omnom :: prelude :: * . let mut cursor = io :: Cursor :: new ( b " lorem - ipsum " ) ; let mut buf = vec! [] . let num_bytes = cursor . read_while ( &mut buf |b| b ! = b ' - ' ) . expect ( " reading from cursor won ' t fail " ) ; assert_eq! ( buf b " lorem " ) ; ` ` `