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Original file line number | Diff line number | Diff line change |
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@@ -1,5 +1,30 @@ | ||
use std::fmt::Debug; | ||
use std::mem; | ||
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use crate::types::Value; | ||
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pub trait SuperType<T: Value> { | ||
fn upcast_internal(v: T) -> Self; | ||
fn upcast_internal(v: &T) -> Self; | ||
} | ||
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#[doc(hidden)] | ||
/// Trait asserting that `Self` is a transparent wrapper around `Self::Inner` | ||
/// with identical representation and may be safely transmuted. | ||
/// | ||
/// # Safety | ||
/// `Self` must be `#[repr(transparent)]` with a field `Self::Inner` | ||
pub unsafe trait TransparentWrapper: Sized { | ||
type Inner: Debug + Copy; | ||
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// A default implementation cannot be provided because it would create | ||
// dependently sized types. This may be supported in a future Rust version. | ||
fn into_inner(self) -> Self::Inner; | ||
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fn wrap_ref(s: &Self::Inner) -> &Self { | ||
unsafe { mem::transmute(s) } | ||
} | ||
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fn wrap_mut(s: &mut Self::Inner) -> &mut Self { | ||
unsafe { mem::transmute(s) } | ||
} | ||
} |
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