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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: 2018-01-13 15:35:35

On 01/13/18 18:20, Peter Dimov via Boost wrote:
>> Andrey Semashev wrote:
>> > I don't think the standard requires this implementation. >
>> `system_category()` may return a pointer to a global caregory
>> instance, > which is initialized before `main`.
>> You're not prohibited from calling system_category() before main, so
>> it has to work.
> You can see for yourself what happens in practice today:
> The g++/clang++ generated code looks cleaner than that, but it's because
> it doesn't include system_category(). Here it is in libc++:
> MS's code is even more convoluted because their <system_error> works
> during process shutdown, after static destruction. But the magic static
> cost is the same in either case.

Here's the gist of what I propose:

It's as optimal as it can get, IMHO.

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