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rust: types: implement `ForeignOwnable` for the unit type 

This allows us to use the unit type `()` when we have no object whose
ownership must be managed but one implementing the `ForeignOwnable`
trait is needed.

Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Wedson Almeida Filho 2023-01-30 03:44:03 -03:00 committed by Miguel Ojeda
parent 26949bac1e
commit 7118594466
1 changed files with 12 additions and 0 deletions
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12
rust/kernel/types.rs
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@ -85,6 +85,18 @@ impl<T: 'static> ForeignOwnable for Box<T> {
} }
} }
impl ForeignOwnable for () {
type Borrowed<'a> = ();
fn into_foreign(self) -> *const core::ffi::c_void {
core::ptr::NonNull::dangling().as_ptr()
}
unsafe fn borrow<'a>(_: *const core::ffi::c_void) -> Self::Borrowed<'a> {}
unsafe fn from_foreign(_: *const core::ffi::c_void) -> Self {}
}
/// Runs a cleanup function/closure when dropped. /// Runs a cleanup function/closure when dropped.
/// ///
/// The [`ScopeGuard::dismiss`] function prevents the cleanup function from running. /// The [`ScopeGuard::dismiss`] function prevents the cleanup function from running.