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Subject: Re: [boost] [system] Would it be possible to trial a breaking change to Boost.System and see what happens?
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2018-01-12 18:40:51

On 01/12/18 21:32, Peter Dimov via Boost wrote:
> Andrey Semashev wrote:
>> In my code I'm using contextual conversion to bool extensively, e.g.
>> "if (err)" or "if (!err)". This is currently equivalent to comparing
>> against 0, so I assume it will be broken by this change.
> It will only be broken if you rely on `error_code( 0, some-category )`
> to contextually-convert to `false`.

I'm not sure how I can *not* rely on that since I construct `error_code`
from enums or ints, all of them having 0 as the "success" value
precisely to allow the contextual conversion produce the intended result.

> A principled approach would be to ask the category whether a code is
> `true` or `false`, but that might be complexity and overhead nobody needs.


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