http_body_util/
empty.rs

1use bytes::Buf;
2use http_body::{Body, Frame, SizeHint};
3use std::{
4    convert::Infallible,
5    fmt,
6    marker::PhantomData,
7    pin::Pin,
8    task::{Context, Poll},
9};
10
11/// A body that is always empty.
12pub struct Empty<D> {
13    _marker: PhantomData<fn() -> D>,
14}
15
16impl<D> Empty<D> {
17    /// Create a new `Empty`.
18    pub fn new() -> Self {
19        Self::default()
20    }
21}
22
23impl<D: Buf> Body for Empty<D> {
24    type Data = D;
25    type Error = Infallible;
26
27    #[inline]
28    fn poll_frame(
29        self: Pin<&mut Self>,
30        _cx: &mut Context<'_>,
31    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
32        Poll::Ready(None)
33    }
34
35    fn is_end_stream(&self) -> bool {
36        true
37    }
38
39    fn size_hint(&self) -> SizeHint {
40        SizeHint::with_exact(0)
41    }
42}
43
44impl<D> fmt::Debug for Empty<D> {
45    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
46        f.debug_struct("Empty").finish()
47    }
48}
49
50impl<D> Default for Empty<D> {
51    fn default() -> Self {
52        Self {
53            _marker: PhantomData,
54        }
55    }
56}
57
58impl<D> Clone for Empty<D> {
59    fn clone(&self) -> Self {
60        *self
61    }
62}
63
64impl<D> Copy for Empty<D> {}
http_body_util/empty.rs

http_body_util/
empty.rs
