/rust/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.31/src/unfold_state.rs

Source (jump to first uncovered line)
use core::pin::Pin;

use pin_project_lite::pin_project;

pin_project! {
    /// UnfoldState used for stream and sink unfolds
    #[project = UnfoldStateProj]
    #[project_replace = UnfoldStateProjReplace]
    #[derive(Debug)]
    pub(crate) enum UnfoldState<T, R> {
        Value {
            value: T,
        },
        Future {
            #[pin]
            future: R,
        },
        Empty,
    }
}

impl<T, R> UnfoldState<T, R> {
    pub(crate) fn project_future(self: Pin<&mut Self>) -> Option<Pin<&mut R>> {
        match self.project() {
            UnfoldStateProj::Future { future } => Some(future),
            _ => None,
        }
    }

    pub(crate) fn take_value(self: Pin<&mut Self>) -> Option<T> {
        match &*self {
            Self::Value { .. } => match self.project_replace(Self::Empty) {
                UnfoldStateProjReplace::Value { value } => Some(value),
                _ => unreachable!(),
            },
            _ => None,
        }
    }
}

Coverage Report

Created: 2024-12-17 06:15

Line	Count	Source (jump to first uncovered line)
1		use core::pin::Pin;
2
3		use pin_project_lite::pin_project;
4
5		pin_project! {
6		/// UnfoldState used for stream and sink unfolds
7		#[project = UnfoldStateProj]
8		#[project_replace = UnfoldStateProjReplace]
9		#[derive(Debug)]
10		pub(crate) enum UnfoldState<T, R> {
11		Value {
12		value: T,
13		},
14		Future {
15		#[pin]
16		future: R,
17		},
18		Empty,
19		}
20		}
21
22		impl<T, R> UnfoldState<T, R> {
23	0	pub(crate) fn project_future(self: Pin<&mut Self>) -> Option<Pin<&mut R>> {
24	0	match self.project() {
25	0	UnfoldStateProj::Future { future } => Some(future),
26	0	_ => None,
27		}
28	0	} Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::project_future Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::project_future Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::project_future
29
30	0	pub(crate) fn take_value(self: Pin<&mut Self>) -> Option<T> {
31	0	match &*self {
32	0	Self::Value { .. } => match self.project_replace(Self::Empty) {
33	0	UnfoldStateProjReplace::Value { value } => Some(value),
34	0	_ => unreachable!(),
35		},
36	0	_ => None,
37		}
38	0	} Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::take_value Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::take_value Unexecuted instantiation: <futures_util::unfold_state::UnfoldState<_, _>>::take_value
39		}