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64 lines
1.1 KiB
64 lines
1.1 KiB
Content-Type: text/x-zim-wiki
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Wiki-Format: zim 0.4
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Creation-Date: 2020-02-12T21:45:56-08:00
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====== FunStuff ======
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===== Dynamic Hash Map Keys =====
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{{{code: lang="rust" linenumbers="True"
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pub mod dynhash {
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use std::any::Any;
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use std::hash::{Hash, Hasher};
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pub trait DynEq: Any {
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fn dyn_eq(&self, other: &dyn DynEq) -> bool;
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fn as_any(&self) -> &dyn Any;
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}
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pub trait DynHash: DynEq {
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fn dyn_hash(&self, hasher: &mut dyn Hasher);
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fn as_dyn_eq(&self) -> &dyn DynEq;
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}
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impl<H: Eq + Any> DynEq for H {
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fn dyn_eq(&self, other: &dyn DynEq) -> bool {
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if let Some(other) = other.as_any().downcast_ref::<H>() {
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self == other
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} else {
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false
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}
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}
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fn as_any(&self) -> &dyn Any {
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self
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}
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}
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impl<H: Hash + DynEq> DynHash for H {
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fn dyn_hash(&self, mut hasher: &mut dyn Hasher) {
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H::hash(self, &mut hasher)
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}
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fn as_dyn_eq(&self) -> &dyn DynEq {
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self
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}
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}
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impl PartialEq for dyn DynHash {
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fn eq(&self, other: &dyn DynHash) -> bool {
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self.dyn_eq(other.as_dyn_eq())
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}
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}
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impl Eq for dyn DynHash {}
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impl Hash for dyn DynHash {
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fn hash<H: Hasher>(&self, hasher: &mut H) {
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self.dyn_hash(hasher)
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}
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}
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}
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}}}
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