34 lines
762 B
Rust
34 lines
762 B
Rust
use std::{marker::PhantomData, ops::Deref, ptr::NonNull};
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use crate::trace::GCTrace;
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pub struct GcRef<T: GCTrace>(pub(crate) NonNull<T>, PhantomData<T>);
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impl<T: GCTrace> Clone for GcRef<T> {
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fn clone(&self) -> Self {
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Self(self.0, self.1)
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}
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}
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impl<T: GCTrace> Deref for GcRef<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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unsafe { self.0.as_ref() }
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}
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}
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impl<T: GCTrace> GcRef<T> {
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pub(crate) unsafe fn new(ptr: NonNull<T>) -> Self {
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Self(ptr, PhantomData)
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}
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/// # Safety
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/// Ensure that this is the only instance of a pointer to the underlying value.
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/// You might want to instead use one of various [cell][`std::cell`] types as the allocated
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/// type
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pub unsafe fn get_mut(this: &mut Self) -> &mut T {
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this.0.as_mut()
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}
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}
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