1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
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`
//~| NOTE `n` is a native pointer; perhaps you need to deref with `(*n).x`
let y : f64 = n.y; //~ no field `y` on type `*mut A`
//~| NOTE `n` is a native pointer; perhaps you need to deref with `(*n).y`
(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);
}
|
