Function tags [src]

Given an enum or error set type, returns a pointer to an array containing all tags for that enum or error set.

Prototype

pub fn tags(comptime T: type) *const [fields(T).len]T

Parameters

T: type

Example

 test tags {
    const E1 = enum { A, B };
    const E2 = error{A};

    const e1_tags = tags(E1);
    const e2_tags = tags(E2);

    try testing.expect(e1_tags.len == 2);
    try testing.expectEqual(E1.A, e1_tags[0]);
    try testing.expectEqual(E1.B, e1_tags[1]);
    try testing.expect(e2_tags.len == 1);
    try testing.expectEqual(E2.A, e2_tags[0]);
}

Source

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