| //@ run-pass |
| #![allow(dead_code)] |
| #![allow(deprecated)] |
| #![allow(non_snake_case)] |
| |
| use std::mem; |
| |
| enum Tag<A,B> { |
| VarA(A), |
| VarB(B), |
| } |
| |
| struct Rec<A,B> { |
| chA: u8, |
| tA: Tag<A,B>, |
| chB: u8, |
| tB: Tag<A,B>, |
| } |
| |
| fn mk_rec<A,B>(a: A, b: B) -> Rec<A,B> { |
| Rec { chA:0, tA:Tag::VarA(a), chB:1, tB:Tag::VarB(b) } |
| } |
| |
| fn is_aligned<A>(amnt: usize, u: &A) -> bool { |
| let p: usize = unsafe { mem::transmute(u) }; |
| return (p & (amnt-1)) == 0; |
| } |
| |
| fn variant_data_is_aligned<A,B>(amnt: usize, u: &Tag<A,B>) -> bool { |
| match u { |
| &Tag::VarA(ref a) => is_aligned(amnt, a), |
| &Tag::VarB(ref b) => is_aligned(amnt, b) |
| } |
| } |
| |
| pub fn main() { |
| let u64_align = std::mem::min_align_of::<u64>(); |
| let x = mk_rec(22u64, 23u64); |
| assert!(is_aligned(u64_align, &x.tA)); |
| assert!(variant_data_is_aligned(u64_align, &x.tA)); |
| assert!(is_aligned(u64_align, &x.tB)); |
| assert!(variant_data_is_aligned(u64_align, &x.tB)); |
| |
| let x = mk_rec(22u64, 23u32); |
| assert!(is_aligned(u64_align, &x.tA)); |
| assert!(variant_data_is_aligned(u64_align, &x.tA)); |
| assert!(is_aligned(u64_align, &x.tB)); |
| assert!(variant_data_is_aligned(4, &x.tB)); |
| |
| let x = mk_rec(22u32, 23u64); |
| assert!(is_aligned(u64_align, &x.tA)); |
| assert!(variant_data_is_aligned(4, &x.tA)); |
| assert!(is_aligned(u64_align, &x.tB)); |
| assert!(variant_data_is_aligned(u64_align, &x.tB)); |
| |
| let x = mk_rec(22u32, 23u32); |
| assert!(is_aligned(4, &x.tA)); |
| assert!(variant_data_is_aligned(4, &x.tA)); |
| assert!(is_aligned(4, &x.tB)); |
| assert!(variant_data_is_aligned(4, &x.tB)); |
| |
| let x = mk_rec(22f64, 23f64); |
| assert!(is_aligned(u64_align, &x.tA)); |
| assert!(variant_data_is_aligned(u64_align, &x.tA)); |
| assert!(is_aligned(u64_align, &x.tB)); |
| assert!(variant_data_is_aligned(u64_align, &x.tB)); |
| } |