std.traits.Fields(T), FieldNameTuple(T) - order guaranteed?

[Jonathan M Davis via Digitalmars-d]

On Wednesday, July 27, 2016 13:09:07 Liam McSherry via Digitalmars-d wrote:
> Since it isn't mentioned in the documentation, do
> `std.traits.Fields(T)` and `std.traits.FieldNameTuple(T)` return
> the fields and field names in a deterministic order?
>
> Further, will they return the fields/field names in the same
> order? That is, will `fields[0]` be the type of `field_names[0]`?

It's not guaranteed, but given their implementations and what they do, it
will almost certainly always be true. But given that it's not guaranteed,
I'm not sure that it would be a great idea to rely on it.

However, there's really no point in relying on it. Just use Fields and use
stringof on a field when you want its name. That's all that FieldNameTuple
is really doing internally anyway.

- Jonathan M Davis