1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

use crate::Buf;

/// Iterator over the bytes contained by the buffer.
///
/// This struct is created by the [`iter`] method on [`Buf`].
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// use bytes::Bytes;
///
/// let buf = Bytes::from(&b"abc"[..]);
/// let mut iter = buf.into_iter();
///
/// assert_eq!(iter.next(), Some(b'a'));
/// assert_eq!(iter.next(), Some(b'b'));
/// assert_eq!(iter.next(), Some(b'c'));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`iter`]: trait.Buf.html#method.iter
/// [`Buf`]: trait.Buf.html
#[derive(Debug)]
pub struct IntoIter<T> {
    inner: T,
}

impl<T> IntoIter<T> {
    /// Creates an iterator over the bytes contained by the buffer.
    ///
    /// # Examples
    ///
    /// ```
    /// use bytes::Bytes;
    ///
    /// let buf = Bytes::from_static(b"abc");
    /// let mut iter = buf.into_iter();
    ///
    /// assert_eq!(iter.next(), Some(b'a'));
    /// assert_eq!(iter.next(), Some(b'b'));
    /// assert_eq!(iter.next(), Some(b'c'));
    /// assert_eq!(iter.next(), None);
    /// ```
    pub(crate) fn new(inner: T) -> IntoIter<T> {
        IntoIter { inner }
    }

    /// Consumes this `IntoIter`, returning the underlying value.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use bytes::{Buf, Bytes};
    ///
    /// let buf = Bytes::from(&b"abc"[..]);
    /// let mut iter = buf.into_iter();
    ///
    /// assert_eq!(iter.next(), Some(b'a'));
    ///
    /// let buf = iter.into_inner();
    /// assert_eq!(2, buf.remaining());
    /// ```
    pub fn into_inner(self) -> T {
        self.inner
    }

    /// Gets a reference to the underlying `Buf`.
    ///
    /// It is inadvisable to directly read from the underlying `Buf`.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use bytes::{Buf, Bytes};
    ///
    /// let buf = Bytes::from(&b"abc"[..]);
    /// let mut iter = buf.into_iter();
    ///
    /// assert_eq!(iter.next(), Some(b'a'));
    ///
    /// assert_eq!(2, iter.get_ref().remaining());
    /// ```
    pub fn get_ref(&self) -> &T {
        &self.inner
    }

    /// Gets a mutable reference to the underlying `Buf`.
    ///
    /// It is inadvisable to directly read from the underlying `Buf`.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use bytes::{Buf, BytesMut};
    ///
    /// let buf = BytesMut::from(&b"abc"[..]);
    /// let mut iter = buf.into_iter();
    ///
    /// assert_eq!(iter.next(), Some(b'a'));
    ///
    /// iter.get_mut().advance(1);
    ///
    /// assert_eq!(iter.next(), Some(b'c'));
    /// ```
    pub fn get_mut(&mut self) -> &mut T {
        &mut self.inner
    }
}

impl<T: Buf> Iterator for IntoIter<T> {
    type Item = u8;

    fn next(&mut self) -> Option<u8> {
        if !self.inner.has_remaining() {
            return None;
        }

        let b = self.inner.chunk()[0];
        self.inner.advance(1);

        Some(b)
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let rem = self.inner.remaining();
        (rem, Some(rem))
    }
}

impl<T: Buf> ExactSizeIterator for IntoIter<T> {}