# empty.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/http-body-0.4.1/src/empty.rs`.
Keywords: rust, rustlang, rust-lang

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    use super::Body;
    use bytes::Buf;
    use http::HeaderMap;
    use std::{
        convert::Infallible,
        fmt,
        marker::PhantomData,
        pin::Pin,
        task::{Context, Poll},
    };

    /// A body that is always empty.
    pub struct Empty<D> {
        _marker: PhantomData<fn() -> D>,
    }

    impl<D> Empty<D> {
        /// Create a new `Empty`.
        pub fn new() -> Self {
            Self::default()
        }
    }

    impl<D: Buf> Body for Empty<D> {
        type Data = D;
        type Error = Infallible;

        #[inline]
        fn poll_data(
            self: Pin<&mut Self>,
            _cx: &mut Context<'_>,
        ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
            Poll::Ready(None)
        }

        #[inline]
        fn poll_trailers(
            self: Pin<&mut Self>,
            _cx: &mut Context<'_>,
        ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
            Poll::Ready(Ok(None))
        }
    }

    impl<D> fmt::Debug for Empty<D> {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.debug_struct("Empty").finish()
        }
    }

    impl<D> Default for Empty<D> {
        fn default() -> Self {
            Self {
                _marker: PhantomData,
            }
        }
    }

    impl<D> Clone for Empty<D> {
        fn clone(&self) -> Self {
            Self {
                _marker: PhantomData,
            }
        }
    }

    impl<D> Copy for Empty<D> {}