Packing of Struct Fields

Per Nordlöw per.nordlow at
Sat Oct 17 13:00:59 UTC 2020

On Saturday, 17 October 2020 at 12:51:21 UTC, ag0aep6g wrote:
> c does come directly after s. The padding between b and c is 
> part of s. If you don't want that padding, you can use 
> `align(1)` to define S without padding. But then 75% of the 
> ints in an S[] will be misaligned.

I understand that. I don't want the alignment of `S` to change. I 
want the padding after `s` in `T` to be avoided and have `c` 
start at byte-offset 7. I don't see why this padding is needed in 
the case where only a single (1-element array of) `S` is stored 
as a field inside another aggregate.

Ali's code prints:

=== Memory layout of 'T' (.sizeof: 12, .alignof: 4) ===
    0: S s
    8: char c
    9: ... 3-byte PADDING

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