38 lines
806 B
Rust
38 lines
806 B
Rust
use std::ops::Deref;
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use std::{hash, ptr};
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/// A wrapper around reference that compares and hashes like a pointer.
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/// Can be used as a key in sets/maps indexed by pointers to avoid `unsafe`.
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#[derive(Debug)]
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pub struct PtrKey<'a, T>(pub &'a T);
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impl<'a, T> Clone for PtrKey<'a, T> {
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fn clone(&self) -> Self {
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*self
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}
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}
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impl<'a, T> Copy for PtrKey<'a, T> {}
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impl<'a, T> PartialEq for PtrKey<'a, T> {
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fn eq(&self, rhs: &Self) -> bool {
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ptr::eq(self.0, rhs.0)
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}
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}
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impl<'a, T> Eq for PtrKey<'a, T> {}
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impl<'a, T> hash::Hash for PtrKey<'a, T> {
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fn hash<H: hash::Hasher>(&self, hasher: &mut H) {
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(self.0 as *const T).hash(hasher)
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}
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}
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impl<'a, T> Deref for PtrKey<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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self.0
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}
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}
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