using .init reliably

[Johan Engelen via Digitalmars-d-learn]

On Friday, 26 August 2016 at 09:48:00 UTC, Jonathan M Davis wrote:
> 
> You're supposed to be able to depend on .init existing. Default 
> initialization for structs can be disabled via
>
> @disable this();
>
> but even then, the init member still exists (it just isn't used 
> for default initialization).

 From what I remember, the last time I looked at `@disable 
this();`:
it prevents the user from creating a default initialized struct. 
However whenever (compiler internally) the struct needs 
initialization, `.init` is still used. And thus it is also used 
at the start of any constructor the user writes.
Don't take my word for it: have a look at asm output, or easier: 
LCD's LLVM IR output.

-Johan