Re: [boost] [system] Header-only Boost.System by default ?

Subject: Re: [boost] [system] Header-only Boost.System by default ?
From: Mike Gresens (mike.gresens_at_[hidden])
Date: 2017-10-10 19:27:39

How does libstdc++ (>= C++11) solve these problems?

Am 10.10.2017 um 10:21 schrieb Groke, Paul via Boost:
>> -----Original Message-----
>> From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of Andrey
>> Semashev via Boost
>> Sent: Dienstag, 10. Oktober 2017 09:32
>> Subject: Re: [boost] [system] Header-only Boost.System by default ?
>>
>> It will have the same address as long as get_basic_error_category() is called
>> within the same module (dll, so, exe, etc.) If this function is compiled in
>> different modules then there will be multiple instances of the category with
>> different addresses.
>>
>> On Linux and probably other Unix-like systems this can be solved by
>> exporting the category instance, which is the default. I don't think this can be
>> done on Windows - you'd have to export get_basic_error_category for that
>> instead and it will make this code less friendly to header-only libraries.
> And even if the "same address" thing was solvable (which I think it is, although not pretty and it would require interface changes), there is the problem with unloading DLLs/SOs. You'd have to pin every module that contains error categories. Which IMO is a side effect that you really don't expect and want, especially from a header-only library.
>
> Paul Groke
>
>
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