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37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
use std::any::{Any};
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use crate::MultitraitObject;
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/// Compares the given value with an Any trait object.
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/// Register this trait if you want to compare two Multitrait objects
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/// with the [TryPartialEq] trait.
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pub trait PartialEqAny {
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fn partial_equal_any(&self, other: &dyn Any) -> bool;
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}
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impl<T: PartialEq + Any> PartialEqAny for T {
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fn partial_equal_any(&self, other: &dyn Any) -> bool {
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if let Some(other) = other.downcast_ref::<T>() {
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self.eq(other)
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} else {
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false
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}
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}
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}
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/// Tries to compare the MultitraitObject with another object
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/// and returns Some(bool) when the underlying type implements PartialEq and
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/// has the [PartialEqAny] trait registered on the object.
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pub trait TryPartialEq {
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fn try_eq(&self, other: &Self) -> Option<bool>;
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}
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impl TryPartialEq for MultitraitObject {
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fn try_eq(&self, other: &Self) -> Option<bool> {
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if let Some(eq_any) = self.downcast_trait::<dyn PartialEqAny>() {
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let any = other.downcast_trait::<dyn Any>().unwrap();
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Some(eq_any.partial_equal_any(any))
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} else {
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None
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}
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}
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} |