mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
27 lines
560 B
Rust
27 lines
560 B
Rust
use std::mem;
|
|
|
|
struct A { x: i32, y: f64 }
|
|
|
|
#[cfg(not(works))]
|
|
unsafe fn access(n:*mut A) -> (i32, f64) {
|
|
let x : i32 = n.x; //~ no field `x` on type `*mut A`
|
|
let y : f64 = n.y; //~ no field `y` on type `*mut A`
|
|
(x, y)
|
|
}
|
|
|
|
#[cfg(works)]
|
|
unsafe fn access(n:*mut A) -> (i32, f64) {
|
|
let x : i32 = (*n).x;
|
|
let y : f64 = (*n).y;
|
|
(x, y)
|
|
}
|
|
|
|
fn main() {
|
|
let a : A = A { x: 3, y: 3.14 };
|
|
let p : &A = &a;
|
|
let (x,y) = unsafe {
|
|
let n : *mut A = mem::transmute(p);
|
|
access(n)
|
|
};
|
|
println!("x: {}, y: {}", x, y);
|
|
}
|