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 const fn new() -> Self {
19        Self {
20            _marker: PhantomData,
21        }
22    }
23}
24
25impl<D: Buf> Body for Empty<D> {
26    type Data = D;
27    type Error = Infallible;
28
29    #[inline]
30    fn poll_frame(
31        self: Pin<&mut Self>,
32        _cx: &mut Context<'_>,
33    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
34        Poll::Ready(None)
35    }
36
37    fn is_end_stream(&self) -> bool {
38        true
39    }
40
41    fn size_hint(&self) -> SizeHint {
42        SizeHint::with_exact(0)
43    }
44}
45
46impl<D> fmt::Debug for Empty<D> {
47    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
48        f.debug_struct("Empty").finish()
49    }
50}
51
52impl<D> Default for Empty<D> {
53    fn default() -> Self {
54        Self::new()
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
