Struct member alignment for external data formats??

[Kagamin]

Tony Wrote:

> I'm reading a very old feature list of D and it says that D has struct 
> member alignment control "to ensure compatibility with externally imposed 
> data formats". So, questions: 1. How does one use that?

align attribute

> 2. Is it accepted 
> practice in D programming to write/read structs to/fro, say a disk file, 
> without marshalling?

It's easy to use feature. Custom serialization is needed on a higher level, say when saving "document".