Re: [boost] Outcome v2

Subject: Re: [boost] Outcome v2
From: Emil Dotchevski (emildotchevski_at_[hidden])
Date: 2017-07-17 20:52:07

On Mon, Jul 17, 2017 at 1:38 AM, Niall Douglas via Boost <
boost_at_[hidden]> wrote:

> However, `afio_error_code_ref` is non-copyable and non-moveable to
> prevent it outliving the object it refers to, so anything consuming a
> `result<T, afio_error_code_ref>` but returns a `result<T,
> std::error_code>` will dump the context, if returning an `outcome<T,
> std::error_code, afio_error_code>` it'll do the copy construction then,
> if an exception is thrown from it then the exception is constructed with
> the payload embedded and so on.
>

It's better to use refcounting for the contextual data, like Boost
Exception does. This is because the context is independent from the error
object itself.

> Outcome v2 says nothing about any of this stuff. Up to the end user to
> customize. As I've mentioned before, you could use TLS to store the
> extra context too. Up to the end user.
>

The fact that programmers can use TLS for anything they want is not a
feature of Outcome :)