Re: [boost] Reforming Boost.System and <system_error> round 2

Subject: Re: [boost] Reforming Boost.System and <system_error> round 2
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2018-01-16 16:15:06

On 01/16/18 19:10, Andrzej Krzemienski via Boost wrote:
> 2018-01-16 17:05 GMT+01:00 Andrey Semashev via Boost <boost_at_[hidden]>
> :
> 
>> On 01/16/18 18:56, Olaf van der Spek via Boost wrote:
>>>
>>> Can't the is_error bool be stored in the ec object itself, at
>>> construction time?
>>
>> Actually, I like this idea. I've modified my benchmark accordingly and it
>> shows nearly identical performance as the current `std::error_code`:
>>
>> Experimental test: 253654 usec, 394237820.022550 tests per second
>> Experimental2 test: 46353 usec, 2157357668.327832 tests per second
>> std test: 45981 usec, 2174811335.116679 tests per second
> 
> This is now getting closer to Boost.outcome, isn't it?

With my limited knowledge of Boost.Outcome, I don't think so. An outcome 
is supposed to carry a value or error, and `error_code` carries only the 
error code.