47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
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//! Wrapper that allows changing the generic type of a PhantomData<T>
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//!
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//! Copied from https://github.com/rkyv/rkyv_contrib (MIT-Apache2 licences) which isn’t published yet.
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use rkyv::{
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with::{ArchiveWith, DeserializeWith, SerializeWith},
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Fallible,
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};
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use std::marker::PhantomData;
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/// A wrapper that allows for changing the generic type of a PhantomData<T>.
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pub struct CustomPhantom<NT: ?Sized> {
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_data: PhantomData<*const NT>,
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}
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impl<OT: ?Sized, NT: ?Sized> ArchiveWith<PhantomData<OT>> for CustomPhantom<NT> {
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type Archived = PhantomData<NT>;
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type Resolver = ();
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#[inline]
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unsafe fn resolve_with(
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_: &PhantomData<OT>,
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_: usize,
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_: Self::Resolver,
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_: *mut Self::Archived,
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) {
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}
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}
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impl<OT: ?Sized, NT: ?Sized, S: Fallible + ?Sized> SerializeWith<PhantomData<OT>, S>
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for CustomPhantom<NT>
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{
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#[inline]
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fn serialize_with(_: &PhantomData<OT>, _: &mut S) -> Result<Self::Resolver, S::Error> {
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Ok(())
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}
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}
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impl<OT: ?Sized, NT: ?Sized, D: Fallible + ?Sized>
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DeserializeWith<PhantomData<NT>, PhantomData<OT>, D> for CustomPhantom<NT>
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{
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#[inline]
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fn deserialize_with(_: &PhantomData<NT>, _: &mut D) -> Result<PhantomData<OT>, D::Error> {
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Ok(PhantomData)
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}
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}
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