| author |  N00byEdge <me@hannesbredberg.se> 2022-08-05 14:47:52+02:00 |
| committer |  GitHub <noreply@github.com> 2022-08-05 15:47:52+03:00 |
| log | 18440cb239755c983f672b4902147c12e819e029 |
| tree | 41c49d99b3fc18ea76d23007cc77a62e15f82a92 |
| parent | 44c321c05e0f5755bcb9f4b1a33dc23aeef880aa |
| signature |  Signed by PGP key 4AEE18F83AFDEB23 |
std.mem.zeroes: Zero sized structs with uninitialized members (#12246)
`std.mem.zeroes(struct{handle: void})` Failed with the following error before:
```
/nix/store/l6v4359wc9xrxxmvvp3rynsb5s3d78xf-zig-0.9.1/lib/zig/std/mem.zig:270:42: error: missing field: 'handle'
if (@sizeOf(T) == 0) return T{};
^
```1 files changed, 4 insertions(+), 1 deletions(-)
lib- std
lib/std/mem.zig+4-1
| ... | ... | @@ -267,7 +267,7 @@ pub fn zeroes(comptime T: type) T { |
| 267 | 267 | return null; |
| 268 | 268 | }, |
| 269 | 269 | .Struct => |struct_info| { |
| 270 | if (@sizeOf(T) == 0) return T{}; | |
| 270 | if (@sizeOf(T) == 0) return undefined; | |
| 271 | 271 | if (struct_info.layout == .Extern) { |
| 272 | 272 | var item: T = undefined; |
| 273 | 273 | set(u8, asBytes(&item), 0); |
| ... | ... | @@ -424,6 +424,9 @@ test "zeroes" { |
| 424 | 424 | |
| 425 | 425 | comptime var comptime_union = zeroes(C_union); |
| 426 | 426 | try testing.expectEqual(@as(u8, 0), comptime_union.a); |
| 427 | ||
| 428 | // Ensure zero sized struct with fields is initialized correctly. | |
| 429 | _ = zeroes(struct { handle: void }); | |
| 427 | 430 | } |
| 428 | 431 | |
| 429 | 432 | /// Initializes all fields of the struct with their default value, or zero values if no default value is present. |