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std: add a special case for empty structs in meta.FieldEnum.

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Empty structs would previously result in a compilation error.
This commit is contained in:
Gregory Oakes 2022-11-19 23:37:29 -06:00 committed by Veikka Tuominen
parent f094c4bce5
commit 8d17e90fcd
1 changed files with 17 additions and 0 deletions
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17
lib/std/meta.zig
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@ -657,6 +657,20 @@ test "std.meta.tags" {
pub fn FieldEnum(comptime T: type) type {
const field_infos = fields(T);
if (field_infos.len == 0) {
// TODO simplify when stage1 is removed
if (@import("builtin").zig_backend == .stage1) @compileError("stage1 doesn't allow empty enums");
return @Type(.{
.Enum = .{
.layout = .Auto,
.tag_type = u0,
.fields = &.{},
.decls = &.{},
.is_exhaustive = true,
},
});
}
if (@typeInfo(T) == .Union) {
if (@typeInfo(T).Union.tag_type) |tag_type| {
for (std.enums.values(tag_type)) |v, i| {
@ -728,6 +742,9 @@ fn expectEqualEnum(expected: anytype, actual: @TypeOf(expected)) !void {
}
test "std.meta.FieldEnum" {
if (comptime @import("builtin").zig_backend != .stage1) {
try expectEqualEnum(enum {}, FieldEnum(struct {}));
}
try expectEqualEnum(enum { a }, FieldEnum(struct { a: u8 }));
try expectEqualEnum(enum { a, b, c }, FieldEnum(struct { a: u8, b: void, c: f32 }));
try expectEqualEnum(enum { a, b, c }, FieldEnum(union { a: u8, b: void, c: f32 }));