asyncband 0.7.0

Composable, runtime-agnostic concurrency building blocks for async Rust.
Documentation 
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use std::any::type_name;
use std::fmt;

/// An error returned when sending on a watch channel without any receivers.
///
/// The value that could not be sent can be retrieved with [`SendError::into_inner`].
#[derive(Clone, PartialEq, Eq)]
pub struct SendError<T>(T);

impl<T> SendError<T> {
    /// Returns a reference to the value that could not be sent.
    pub fn as_inner(&self) -> &T {
        &self.0
    }

    /// Consumes the error and returns the value that could not be sent.
    pub fn into_inner(self) -> T {
        self.0
    }

    pub(super) fn new(value: T) -> Self {
        Self(value)
    }
}

impl<T> fmt::Display for SendError<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("sending on a disconnected channel")
    }
}

impl<T> fmt::Debug for SendError<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "SendError<{}>(..)", type_name::<T>())
    }
}

impl<T> std::error::Error for SendError<T> {}

/// An error returned after all senders have been dropped and no unseen value remains.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RecvError {
    /// All senders have been dropped, so the current value will never change again.
    Disconnected,
}

impl fmt::Display for RecvError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("receiving on a disconnected channel")
    }
}

impl std::error::Error for RecvError {}