55 lines
1.1 KiB
Rust
55 lines
1.1 KiB
Rust
// check-pass
|
|
|
|
#![allow(dead_code)]
|
|
|
|
trait Structure<E>: Sized where E: Encoding {
|
|
type RefTarget: ?Sized;
|
|
type FfiPtr;
|
|
unsafe fn borrow_from_ffi_ptr<'a>(ptr: Self::FfiPtr) -> Option<&'a Self::RefTarget>;
|
|
}
|
|
|
|
enum Slice {}
|
|
|
|
impl<E> Structure<E> for Slice where E: Encoding {
|
|
type RefTarget = [E::Unit];
|
|
type FfiPtr = (*const E::FfiUnit, usize);
|
|
unsafe fn borrow_from_ffi_ptr<'a>(_ptr: Self::FfiPtr) -> Option<&'a Self::RefTarget> {
|
|
panic!()
|
|
}
|
|
}
|
|
|
|
trait Encoding {
|
|
type Unit: Unit;
|
|
type FfiUnit;
|
|
}
|
|
|
|
trait Unit {}
|
|
|
|
enum Utf16 {}
|
|
|
|
impl Encoding for Utf16 {
|
|
type Unit = Utf16Unit;
|
|
type FfiUnit = u16;
|
|
}
|
|
|
|
struct Utf16Unit(pub u16);
|
|
|
|
impl Unit for Utf16Unit {}
|
|
|
|
type SUtf16Str = SeStr<Slice, Utf16>;
|
|
|
|
struct SeStr<S, E> where S: Structure<E>, E: Encoding {
|
|
_data: S::RefTarget,
|
|
}
|
|
|
|
impl<S, E> SeStr<S, E> where S: Structure<E>, E: Encoding {
|
|
pub unsafe fn from_ptr<'a>(_ptr: S::FfiPtr) -> Option<&'a Self> {
|
|
panic!()
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
const TEXT_U16: &'static [u16] = &[];
|
|
let _ = unsafe { SUtf16Str::from_ptr((TEXT_U16.as_ptr(), TEXT_U16.len())).unwrap() };
|
|
}
|