Re: [boost] expected/result/etc

Subject: Re: [boost] expected/result/etc
From: Emil Dotchevski (emildotchevski_at_[hidden])
Date: 2016-01-28 15:02:45

On Wed, Jan 27, 2016 at 10:49 PM, Michael Marcin <mike.marcin_at_[hidden]>
wrote:

> So looking a few of these libraries/proposals I have a few things I'm
> interested in.
>
> - Is it at least as good as a simple hand-rolled solution?
> - Can you transport error codes through layers without knowing specifics
> of an error?
>
> For the second Niall's outcome/result handles very well I think.
> std::error_code and std::exception_ptr transport is good enough for almost
> any reasonable type agnostic error transport.
>

Have you considered using Boost Exception? It lets you add arbitrary data
to exception objects, even after they have been thrown, regardless of their
type -- see
http://www.boost.org/doc/libs/release/libs/exception/doc/error_info.html.
The general idea is to adopt a strategy where the exception objects are
augmented with any, even platform-specific relevant data, which then the
catch site can analyze to choose the correct handling.

Cheers,
Emil