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

On 01/16/18 19:10, Andrzej Krzemienski via Boost wrote:

2018-01-16 17:05 GMT+01:00 Andrey Semashev via Boost :

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On 01/16/18 18:56, Olaf van der Spek via Boost wrote:

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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.