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Fix use of unaligned references in example #317

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Apr 20, 2022
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Fix use of unaligned references in example #317

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9 changes: 7 additions & 2 deletions src/c-tips/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -357,8 +357,13 @@ struct Foo {

fn main() {
let v = Foo { x: 0, y: 0, z: 0 };
// Unsafe is required to borrow a field of a packed struct.
unsafe { println!("{:p} {:p} {:p}", &v.x, &v.y, &v.z) };
// References must always be aligned, so to check the addresses of the
// struct's fields, we use `std::ptr::addr_of!()` to get a raw pointer
// instead of just printing `&v.x`.
let px = std::ptr::addr_of!(v.x);
let py = std::ptr::addr_of!(v.y);
let pz = std::ptr::addr_of!(v.z);
println!("{:p} {:p} {:p}", px, py, pz);
}

// 0x7ffd33598490 0x7ffd33598492 0x7ffd33598493
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