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use std::{fmt::Debug, marker::PhantomData, ops::Deref};
use anyhow::Result;
use crate::{
SharedReference,
trace::{TraceRawVcs, TraceRawVcsContext},
};
/// Pass a value by value (`Value<Xxx>`) instead of by reference (`Vc<Xxx>`).
///
/// Doesn't require serialization, and won't be stored in the persistent cache
/// in the future.
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Hash)]
pub struct TransientValue<T> {
inner: T,
}
impl<T> TransientValue<T> {
pub fn new(value: T) -> Self {
Self { inner: value }
}
pub fn into_value(self) -> T {
self.inner
}
}
impl<T> Deref for TransientValue<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<T: TraceRawVcs> TraceRawVcs for TransientValue<T> {
fn trace_raw_vcs(&self, trace_context: &mut TraceRawVcsContext) {
self.inner.trace_raw_vcs(trace_context)
}
}
/// Pass a reference to an instance to a turbo-tasks function.
///
/// Equality and hash is implemented as pointer comparison.
///
/// Doesn't require serialization, and won't be stored in the persistent cache
/// in the future, so we don't include the `ValueTypeId` in the
/// `SharedReference`.
pub struct TransientInstance<T> {
inner: SharedReference,
phantom: PhantomData<T>,
}
impl<T> Debug for TransientInstance<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("TransientInstance").finish()
}
}
impl<T> Clone for TransientInstance<T> {
fn clone(&self) -> Self {
Self {
inner: self.inner.clone(),
phantom: self.phantom,
}
}
}
impl<T> Eq for TransientInstance<T> {}
impl<T> PartialEq for TransientInstance<T> {
fn eq(&self, other: &Self) -> bool {
self.inner == other.inner
}
}
impl<T> std::hash::Hash for TransientInstance<T> {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.inner.hash(state);
}
}
impl<T: Send + Sync + 'static> From<TransientInstance<T>> for triomphe::Arc<T> {
fn from(instance: TransientInstance<T>) -> Self {
// we know this downcast must work because we have type T
instance.inner.downcast().unwrap()
}
}
impl<T: Send + Sync + 'static> From<TransientInstance<T>> for SharedReference {
fn from(instance: TransientInstance<T>) -> Self {
instance.inner
}
}
impl<T: Send + Sync + 'static> From<triomphe::Arc<T>> for TransientInstance<T> {
fn from(arc: triomphe::Arc<T>) -> Self {
Self {
inner: SharedReference::new(arc),
phantom: PhantomData,
}
}
}
impl<T: Send + Sync + 'static> TryFrom<SharedReference> for TransientInstance<T> {
type Error = ();
fn try_from(inner: SharedReference) -> Result<Self, Self::Error> {
if inner.0.downcast_ref::<T>().is_some() {
Ok(Self {
inner,
phantom: PhantomData,
})
} else {
Err(())
}
}
}
impl<T: Send + Sync + 'static> TransientInstance<T> {
pub fn new(value: T) -> Self {
Self {
inner: SharedReference::new(triomphe::Arc::new(value)),
phantom: PhantomData,
}
}
}
impl<T: 'static> Deref for TransientInstance<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.inner.0.downcast_ref().unwrap()
}
}
impl<T: TraceRawVcs + 'static> TraceRawVcs for TransientInstance<T> {
fn trace_raw_vcs(&self, trace_context: &mut TraceRawVcsContext) {
self.inner.downcast_ref::<T>().trace_raw_vcs(trace_context)
}
}
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