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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright the Vortex contributors
use std::any::Any;
// TODO(adam): Look into having a similar setup as dyn-hash that will allow deriving `PartialEq` for structs
// that have `Arc<dyn Trait>` fields.
/// Allows comparing dyn-compatible objects, like [`ExprRef`](crate::ExprRef).
pub trait DynEq {
fn dyn_eq(&self, other: &dyn Any) -> bool;
}
impl<T: Eq + Any> DynEq for T {
fn dyn_eq(&self, other: &dyn Any) -> bool {
Some(self) == other.downcast_ref::<Self>()
}
}
#[cfg(test)]
mod tests {
use std::any::Any;
use std::fmt::Debug;
use super::DynEq;
trait MyTrait: DynEq + Debug + Any {}
impl MyTrait for u32 {}
impl MyTrait for u64 {}
impl PartialEq for dyn MyTrait {
fn eq(&self, other: &Self) -> bool {
self.dyn_eq(other)
}
}
#[test]
fn test_dyn_eq() {
let var_w = &2_u32 as &dyn MyTrait;
let var_x = &5_u32 as &dyn MyTrait;
let var_y = &5_u32 as &dyn MyTrait;
let var_z = &5_u64 as &dyn MyTrait;
// Same value, same type
assert_eq!(var_x, var_y);
// Different value, same type
assert_ne!(var_w, var_x);
// Same value, different type
assert_ne!(var_y, var_z);
}
}