await-tree 0.3.1

Generate accurate and informative tree dumps of asynchronous tasks.
Documentation 
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// Copyright 2023 RisingWave Labs
//
// Licensed 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.

//! Utilities for using `Any` as the key of a `HashMap`.

// Adopted from:
// https://github.com/bevyengine/bevy/blob/56bcbb097552b45e3ff48c48947ed8ee4e2c24b1/crates/bevy_utils/src/label.rs

use std::any::Any;
use std::hash::{Hash, Hasher};

/// An object safe version of [`Eq`]. This trait is automatically implemented
/// for any `'static` type that implements `Eq`.
pub(crate) trait DynEq: Any {
    /// Casts the type to `dyn Any`.
    fn as_any(&self) -> &dyn Any;

    /// This method tests for `self` and `other` values to be equal.
    ///
    /// Implementers should avoid returning `true` when the underlying types are
    /// not the same.
    fn dyn_eq(&self, other: &dyn DynEq) -> bool;
}

impl<T> DynEq for T
where
    T: Any + Eq,
{
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn dyn_eq(&self, other: &dyn DynEq) -> bool {
        if let Some(other) = other.as_any().downcast_ref::<T>() {
            return self == other;
        }
        false
    }
}

/// An object safe version of [`Hash`]. This trait is automatically implemented
/// for any `'static` type that implements `Hash`.
pub(crate) trait DynHash: DynEq {
    /// Casts the type to `dyn Any`.
    fn as_dyn_eq(&self) -> &dyn DynEq;

    /// Feeds this value into the given [`Hasher`].
    fn dyn_hash(&self, state: &mut dyn Hasher);
}

impl<T> DynHash for T
where
    T: DynEq + Hash,
{
    fn as_dyn_eq(&self) -> &dyn DynEq {
        self
    }

    fn dyn_hash(&self, mut state: &mut dyn Hasher) {
        T::hash(self, &mut state);
        self.type_id().hash(&mut state);
    }
}