Function fieldNames [src]

Prototype

pub fn fieldNames(comptime T: type) *const [fields(T).len][:0]const u8

Parameters

T: type

Example

 test 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);

    try testing.expect(e1names.len == 2);
    try testing.expectEqualSlices(u8, e1names[0], "A");
    try testing.expectEqualSlices(u8, e1names[1], "B");
    try testing.expect(e2names.len == 1);
    try testing.expectEqualSlices(u8, e2names[0], "A");
    try testing.expect(s1names.len == 1);
    try testing.expectEqualSlices(u8, s1names[0], "a");
    try testing.expect(u1names.len == 2);
    try testing.expectEqualSlices(u8, u1names[0], "a");
    try testing.expectEqualSlices(u8, u1names[1], "b");
}

Source

  pub fn fieldNames(comptime T: type) *const [fields(T).len][:0]const u8 {
    return comptime blk: {
        const fieldInfos = fields(T);
        var names: [fieldInfos.len][:0]const u8 = undefined;
        for (&names, fieldInfos) |*name, field| name.* = field.name;
        const final = names;
        break :blk &final;
    };
}  