120 lines
3.2 KiB
Rust
120 lines
3.2 KiB
Rust
//@ run-pass
|
|
// check raw fat pointer ops
|
|
|
|
use std::mem;
|
|
|
|
fn assert_inorder<T: PartialEq + PartialOrd>(a: &[T]) {
|
|
for i in 0..a.len() {
|
|
for j in 0..a.len() {
|
|
if i < j {
|
|
assert!(a[i] < a[j]);
|
|
assert!(a[i] <= a[j]);
|
|
assert!(!(a[i] == a[j]));
|
|
assert!(a[i] != a[j]);
|
|
assert!(!(a[i] >= a[j]));
|
|
assert!(!(a[i] > a[j]));
|
|
} else if i == j {
|
|
assert!(!(a[i] < a[j]));
|
|
assert!(a[i] <= a[j]);
|
|
assert!(a[i] == a[j]);
|
|
assert!(!(a[i] != a[j]));
|
|
assert!(a[i] >= a[j]);
|
|
assert!(!(a[i] > a[j]));
|
|
} else {
|
|
assert!(!(a[i] < a[j]));
|
|
assert!(!(a[i] <= a[j]));
|
|
assert!(!(a[i] == a[j]));
|
|
assert!(a[i] != a[j]);
|
|
assert!(a[i] >= a[j]);
|
|
assert!(a[i] > a[j]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
trait Foo { fn foo(&self) -> usize; } //~ WARN method `foo` is never used
|
|
impl<T> Foo for T {
|
|
fn foo(&self) -> usize {
|
|
mem::size_of::<T>()
|
|
}
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
struct S<T:?Sized>(u32, T);
|
|
|
|
fn main() {
|
|
let mut array = [0,1,2,3,4];
|
|
let mut array2 = [5,6,7,8,9];
|
|
|
|
// fat ptr comparison: addr then extra
|
|
|
|
// check ordering for arrays
|
|
let mut ptrs: Vec<*const [u8]> = vec![
|
|
&array[0..0], &array[0..1], &array, &array[1..]
|
|
];
|
|
|
|
let array_addr = &array as *const [u8] as *const u8 as usize;
|
|
let array2_addr = &array2 as *const [u8] as *const u8 as usize;
|
|
if array2_addr < array_addr {
|
|
ptrs.insert(0, &array2);
|
|
} else {
|
|
ptrs.push(&array2);
|
|
}
|
|
assert_inorder(&ptrs);
|
|
|
|
// check ordering for mut arrays
|
|
let mut ptrs: Vec<*mut [u8]> = vec![
|
|
&mut array[0..0], &mut array[0..1], &mut array, &mut array[1..]
|
|
];
|
|
|
|
let array_addr = &mut array as *mut [u8] as *mut u8 as usize;
|
|
let array2_addr = &mut array2 as *mut [u8] as *mut u8 as usize;
|
|
if array2_addr < array_addr {
|
|
ptrs.insert(0, &mut array2);
|
|
} else {
|
|
ptrs.push(&mut array2);
|
|
}
|
|
assert_inorder(&ptrs);
|
|
|
|
let mut u8_ = (0u8, 1u8);
|
|
let mut u32_ = (4u32, 5u32);
|
|
|
|
// check ordering for ptrs
|
|
let buf: &mut [*const dyn Foo] = &mut [
|
|
&u8_, &u8_.0,
|
|
&u32_, &u32_.0,
|
|
];
|
|
buf.sort_by(|u,v| {
|
|
let u : [*const (); 2] = unsafe { mem::transmute(*u) };
|
|
let v : [*const (); 2] = unsafe { mem::transmute(*v) };
|
|
u.cmp(&v)
|
|
});
|
|
assert_inorder(buf);
|
|
|
|
// check ordering for mut ptrs
|
|
let buf: &mut [*mut dyn Foo] = &mut [
|
|
&mut u8_, &mut u8_.0,
|
|
&mut u32_, &mut u32_.0,
|
|
];
|
|
buf.sort_by(|u,v| {
|
|
let u : [*const (); 2] = unsafe { mem::transmute(*u) };
|
|
let v : [*const (); 2] = unsafe { mem::transmute(*v) };
|
|
u.cmp(&v)
|
|
});
|
|
assert_inorder(buf);
|
|
|
|
// check ordering for structs containing arrays
|
|
let ss: (S<[u8; 2]>,
|
|
S<[u8; 3]>,
|
|
S<[u8; 2]>) = (
|
|
S(7, [8, 9]),
|
|
S(10, [11, 12, 13]),
|
|
S(4, [5, 6])
|
|
);
|
|
assert_inorder(&[
|
|
&ss.0 as *const S<[u8]>,
|
|
&ss.1 as *const S<[u8]>,
|
|
&ss.2 as *const S<[u8]>
|
|
]);
|
|
}
|