53 lines
978 B
Rust
53 lines
978 B
Rust
//@ run-pass
|
|
// test that ordinary fat pointer operations work.
|
|
|
|
struct Wrapper<T: ?Sized>(#[allow(dead_code)] u32, T);
|
|
|
|
struct FatPtrContainer<'a> {
|
|
ptr: &'a [u8]
|
|
}
|
|
|
|
fn fat_ptr_project(a: &Wrapper<[u8]>) -> &[u8] {
|
|
&a.1
|
|
}
|
|
|
|
fn fat_ptr_simple(a: &[u8]) -> &[u8] {
|
|
a
|
|
}
|
|
|
|
fn fat_ptr_via_local(a: &[u8]) -> &[u8] {
|
|
let x = a;
|
|
x
|
|
}
|
|
|
|
fn fat_ptr_from_struct(s: FatPtrContainer) -> &[u8] {
|
|
s.ptr
|
|
}
|
|
|
|
fn fat_ptr_to_struct(a: &[u8]) -> FatPtrContainer {
|
|
FatPtrContainer { ptr: a }
|
|
}
|
|
|
|
fn fat_ptr_store_to<'a>(a: &'a [u8], b: &mut &'a [u8]) {
|
|
*b = a;
|
|
}
|
|
|
|
fn fat_ptr_constant() -> &'static str {
|
|
"HELLO"
|
|
}
|
|
|
|
fn main() {
|
|
let a = Wrapper(4, [7,6,5]);
|
|
|
|
let p = fat_ptr_project(&a);
|
|
let p = fat_ptr_simple(p);
|
|
let p = fat_ptr_via_local(p);
|
|
let p = fat_ptr_from_struct(fat_ptr_to_struct(p));
|
|
|
|
let mut target : &[u8] = &[42];
|
|
fat_ptr_store_to(p, &mut target);
|
|
assert_eq!(target, &a.1);
|
|
|
|
assert_eq!(fat_ptr_constant(), "HELLO");
|
|
}
|