104 lines
1.9 KiB
Rust
104 lines
1.9 KiB
Rust
// Test DST raw pointers
|
|
|
|
|
|
trait Trait {
|
|
fn foo(&self) -> isize;
|
|
}
|
|
|
|
struct A {
|
|
f: isize
|
|
}
|
|
impl Trait for A {
|
|
fn foo(&self) -> isize {
|
|
self.f
|
|
}
|
|
}
|
|
|
|
struct Foo<T: ?Sized> {
|
|
f: T
|
|
}
|
|
|
|
pub fn main() {
|
|
// raw trait object
|
|
let x = A { f: 42 };
|
|
let z: *const Trait = &x;
|
|
let r = unsafe {
|
|
(&*z).foo()
|
|
};
|
|
assert_eq!(r, 42);
|
|
|
|
// raw DST struct
|
|
let p = Foo {f: A { f: 42 }};
|
|
let o: *const Foo<Trait> = &p;
|
|
let r = unsafe {
|
|
(&*o).f.foo()
|
|
};
|
|
assert_eq!(r, 42);
|
|
|
|
// raw slice
|
|
let a: *const [_] = &[1, 2, 3];
|
|
unsafe {
|
|
let b = (*a)[2];
|
|
assert_eq!(b, 3);
|
|
let len = (*a).len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
|
|
// raw slice with explicit cast
|
|
let a = &[1, 2, 3] as *const [i32];
|
|
unsafe {
|
|
let b = (*a)[2];
|
|
assert_eq!(b, 3);
|
|
let len = (*a).len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
|
|
// raw DST struct with slice
|
|
let c: *const Foo<[_]> = &Foo {f: [1, 2, 3]};
|
|
unsafe {
|
|
let b = (&*c).f[0];
|
|
assert_eq!(b, 1);
|
|
let len = (&*c).f.len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
|
|
// all of the above with *mut
|
|
let mut x = A { f: 42 };
|
|
let z: *mut Trait = &mut x;
|
|
let r = unsafe {
|
|
(&*z).foo()
|
|
};
|
|
assert_eq!(r, 42);
|
|
|
|
let mut p = Foo {f: A { f: 42 }};
|
|
let o: *mut Foo<Trait> = &mut p;
|
|
let r = unsafe {
|
|
(&*o).f.foo()
|
|
};
|
|
assert_eq!(r, 42);
|
|
|
|
let a: *mut [_] = &mut [1, 2, 3];
|
|
unsafe {
|
|
let b = (*a)[2];
|
|
assert_eq!(b, 3);
|
|
let len = (*a).len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
|
|
let a = &mut [1, 2, 3] as *mut [i32];
|
|
unsafe {
|
|
let b = (*a)[2];
|
|
assert_eq!(b, 3);
|
|
let len = (*a).len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
|
|
let c: *mut Foo<[_]> = &mut Foo {f: [1, 2, 3]};
|
|
unsafe {
|
|
let b = (&*c).f[0];
|
|
assert_eq!(b, 1);
|
|
let len = (&*c).f.len();
|
|
assert_eq!(len, 3);
|
|
}
|
|
}
|