New abstraction: Layout

[Steven Schveighoffer]

On 2/17/18 9:59 AM, Andrei Alexandrescu wrote:
> On 02/17/2018 09:03 AM, Steven Schveighoffer wrote:
>> I found this also works:
>>
>> static foreach(alias x; S.tupleof)
>> {
>>     writeln(x.offsetof);
>> }
> 
> Yes, the implementation uses offsetof.
> 

I guess I'm just confused based on the statement "the builtin .tupleof 
... [omits] the essential information of field offsets."

What is this construct giving us that .tupleof doesn't?

-Steve