40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::mem;
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struct A { x: i32, y: f64 }
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#[cfg(not(works))]
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unsafe fn access(n:*mut A) -> (i32, f64) {
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let x : i32 = n.x; //~ ERROR attempted access of field `x`
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//~| NOTE `n` is a native pointer; perhaps you need to deref with `(*n).x`
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let y : f64 = n.y; //~ ERROR attempted access of field `y`
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//~| NOTE `n` is a native pointer; perhaps you need to deref with `(*n).y`
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(x, y)
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}
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#[cfg(works)]
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unsafe fn access(n:*mut A) -> (i32, f64) {
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let x : i32 = (*n).x;
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let y : f64 = (*n).y;
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(x, y)
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}
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fn main() {
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let a : A = A { x: 3, y: 3.14 };
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let p : &A = &a;
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let (x,y) = unsafe {
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let n : *mut A = mem::transmute(p);
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access(n)
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};
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println!("x: {}, y: {}", x, y);
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}
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