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Added std.meta.fieldNames

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Alexandros Naskos 2020-11-06 10:45:49 +02:00 committed by Veikka Tuominen
parent 6d5b76a75d
commit 252924ae33
1 changed files with 41 additions and 0 deletions
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41
lib/std/meta.zig
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@ -413,6 +413,47 @@ test "std.meta.fieldInfo" {
testing.expect(comptime uf.field_type == u8);
}
pub fn fieldNames(comptime T: type) *const [fields(T).len][]const u8 {
comptime {
const fieldInfos = fields(T);
var names: [fieldInfos.len][]const u8 = undefined;
for (fieldInfos) |field, i| {
names[i] = field.name;
}
return &names;
}
}
test "std.meta.fieldNames" {
const E1 = enum {
A, B
};
const E2 = error{A};
const S1 = struct {
a: u8,
};
const U1 = union {
a: u8,
b: void,
};
const e1names = fieldNames(E1);
const e2names = fieldNames(E2);
const s1names = fieldNames(S1);
const u1names = fieldNames(U1);
testing.expect(e1names.len == 2);
testing.expectEqualSlices(u8, e1names[0], "A");
testing.expectEqualSlices(u8, e1names[1], "B");
testing.expect(e2names.len == 1);
testing.expectEqualSlices(u8, e2names[0], "A");
testing.expect(s1names.len == 1);
testing.expectEqualSlices(u8, s1names[0], "a");
testing.expect(u1names.len == 2);
testing.expectEqualSlices(u8, u1names[0], "a");
testing.expectEqualSlices(u8, u1names[1], "b");
}
pub fn TagType(comptime T: type) type {
return switch (@typeInfo(T)) {
.Enum => |info| info.tag_type,