exceptions vs error codes

[Steven Schveighoffer via Digitalmars-d]

On 7/9/16 11:02 PM, Superstar64 wrote:
> In terms of performance and code generation exceptions are faster in the
> regular path while error codes are faster in the error path.
>
> Would it be possible and a good idea to have a language feature that
> allows some exceptions to use error code code generation.

Swift does exactly this. It doesn't have exceptions, but mimics them by 
passing a hidden "error" parameter that is filled in if an error occurs. 
No stack unwinding occurs, just normal returns.

This allows them to get around stack unwinding issues with ARC.

I don't think this is possible for D to switch to. It would break too 
much code. You have to instrument your code properly to get this 
behavior, and it's actually quite unpleasant IMO.

-Steve