Order of object fields

[Steven Schveighoffer]

On 1/27/22 8:13 AM, Steven Schveighoffer wrote:
> On Thursday, 27 January 2022 at 12:45:20 UTC, frame wrote:
>> Is the order of fields guaranteed returned by `.tupleof` and 
>> `__traits(getMember,...)`, can I rely on this? I know that are 
>> different things, I mean just per each use case if I have more 
>> functions that traverses through all fields. Thx.
> 
> Not for classes. The compiler is free to reorder if it wants to.
> 
> Yes for structs.

To clarify, the compiler can reorder the members to fit them better. But 
it will be the same order for any particular build of the object files.

Any compile-time features that fetch the members should be in the same 
order as the compiler has decided to lay them out. It's just that it 
might not match the source code order.

-Steve