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use std::{
fmt::{self, Debug, Display, Formatter},
hash::{Hash, Hasher},
marker::PhantomData,
};
pub struct Id<T> {
id: salsa::InternId,
_ty: PhantomData<fn(T) -> T>,
}
impl<T> Clone for Id<T> {
fn clone(&self) -> Id<T> {
Id {
id: self.id,
_ty: PhantomData,
}
}
}
impl<T> Copy for Id<T> {}
impl<T> Debug for Id<T> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
Debug::fmt(&self.id, f)
}
}
impl<T> Display for Id<T> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
Display::fmt(&self.id, f)
}
}
impl<T> Hash for Id<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
impl<T> PartialEq for Id<T> {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl<T> Eq for Id<T> {}
impl<T> salsa::InternKey for Id<T> {
fn from_intern_id(id: salsa::InternId) -> Self {
Self {
id,
_ty: PhantomData,
}
}
fn as_intern_id(&self) -> salsa::InternId {
self.id
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::mem::size_of;
#[test]
fn id_size() {
struct Foo {
_x: String,
}
assert_eq!(size_of::<Id<Foo>>(), size_of::<salsa::InternId>());
}
}