pending.rs.html -- source

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aho_corasick

packed

teddy

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main.rs mod.rs prove.rs verify.rs

error.rs gadgets.rs lib.rs

dusk_tlv

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dusk_uds

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fmt

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writer

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codegen

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pin_utils

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rand

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ser

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sha2

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sha3

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slab

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termcolor

textwrap

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thread_local

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time

display.rs duration.rs lib.rs parse.rs sys.rs

typenum

array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

vec_map

use core::marker;
use core::pin::Pin;
use futures_core::stream::{FusedStream, Stream};
use futures_core::task::{Context, Poll};

/// Stream for the [`pending()`] function.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Pending<T> {
    _data: marker::PhantomData<T>,
}

/// Creates a stream which never returns any elements.
///
/// The returned stream will always return `Pending` when polled.
pub fn pending<T>() -> Pending<T> {
    Pending { _data: marker::PhantomData }
}

impl<T> Unpin for Pending<T> {}

impl<T> FusedStream for Pending<T> {
    fn is_terminated(&self) -> bool {
        true
    }
}

impl<T> Stream for Pending<T> {
    type Item = T;

    fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        Poll::Pending
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (0, Some(0))
    }
}

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