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

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    use crate::Body;
    use bytes::Buf;
    use std::{
        fmt,
        pin::Pin,
        task::{Context, Poll},
    };

    /// A boxed [`Body`] trait object.
    pub struct BoxBody<D, E> {
        inner: Pin<Box<dyn Body<Data = D, Error = E> + Send + Sync + 'static>>,
    }

    impl<D, E> BoxBody<D, E> {
        /// Create a new `BoxBody`.
        pub fn new<B>(body: B) -> Self
        where
            B: Body<Data = D, Error = E> + Send + Sync + 'static,
            D: Buf,
        {
            Self {
                inner: Box::pin(body),
            }
        }
    }

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

    impl<D, E> Body for BoxBody<D, E>
    where
        D: Buf,
    {
        type Data = D;
        type Error = E;

        fn poll_data(
            mut self: Pin<&mut Self>,
            cx: &mut Context<'_>,
        ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
            self.inner.as_mut().poll_data(cx)
        }

        fn poll_trailers(
            mut self: Pin<&mut Self>,
            cx: &mut Context<'_>,
        ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
            self.inner.as_mut().poll_trailers(cx)
        }

        fn is_end_stream(&self) -> bool {
            self.inner.is_end_stream()
        }

        fn size_hint(&self) -> crate::SizeHint {
            self.inner.size_hint()
        }
    }