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std.mem.zeroes: Zero sized structs with uninitialized members (#12246)

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`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{};
                                         ^
```
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N00byEdge 2022-08-05 14:47:52 +02:00 committed by GitHub
parent 44c321c05e
commit 18440cb239
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lib/std/mem.zig
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@ -267,7 +267,7 @@ pub fn zeroes(comptime T: type) T {
return null;
},
.Struct => |struct_info| {
if (@sizeOf(T) == 0) return T{};
if (@sizeOf(T) == 0) return undefined;
if (struct_info.layout == .Extern) {
var item: T = undefined;
set(u8, asBytes(&item), 0);
@ -424,6 +424,9 @@ test "zeroes" {
comptime var comptime_union = zeroes(C_union);
try testing.expectEqual(@as(u8, 0), comptime_union.a);
// Ensure zero sized struct with fields is initialized correctly.
_ = zeroes(struct { handle: void });
}
/// Initializes all fields of the struct with their default value, or zero values if no default value is present.