Wouldn't this be better with bitfields?

[Walter Bright]

On 7/9/2024 4:58 AM, Mike Parker wrote:
> `extern(C)` does not affect the layout of anything, as far as I know. It only 
> impacts name mangling and calling convention. Using it to change layout would be 
> a new feature.

There is a case where it does. A struct with no data members is zero size if 
extern(C), otherwise it is size 1. The size 1 comes from C++, which (correctly) 
decided that individual objects should have distinct addresses.

This does have the potential to be memory unsafe, and a struct with no data 
members should probably be rejected in @safe mode.

https://issues.dlang.org/show_bug.cgi?id=24657