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Re: [ub] Draft 2 of Enhanced C/C++ memory and object model

From: David Vandevoorde <daveed_at_[hidden]>
Date: Fri, 29 Mar 2019 09:11:36 -0400
> On Mar 29, 2019, at 6:48 AM, Ville Voutilainen <ville.voutilainen_at_[hidden]> wrote:
> On Fri, 29 Mar 2019 at 12:33, Niall Douglas <s_sourceforge_at_[hidden]> wrote:
>>> | But down the line, absolutely yes Modules need to become objects. They
>>> | would be as-if a giant struct full of data objects and function objects.
>>> | They would be attached, and detached, exactly as any other object under
>>> | this proposal. This would effectively implement shared libraries into C++.
>>> |
>>> | We then can redefine C++ programs to be a graph of binary Modules to be
>>> | bootstrapped by a Modules loader. So your .exe program might be a few
>>> | Kb, and it would simply map into memory all the binary Modules its
>>> | manifest specifies from the system binary Modules database.
>>> What problems would such a proposal attempt to solve?
>> The answer is "too many to usefully list". But I can give you my
>> personal top three, for brevity and clarity.
>> 1. It would solve the shared library problem for C and C++, without
>> using broken proprietary shared libraries to do it.
> *snip snap*
> I don't follow this explanation at all. Earlier you said that a
> program maps into memory some binary Modules.
> Binary modules are object files. Mapping object files into memory is
> exactly what my dynloader does today.
> If you want to create some cloudy repository that "everybody" uses for
> their builds, you can do it with shared libraries.
> Many people already do. I don't see what "Modules need to become
> objects" has to do with any of that. If you expect
> programs to reach into a cloudy repository to magically update their
> "binary modules" somehow differently from
> updating their shared libraries, I don't see why we should expect that
> to happen any more than it happens with
> shared libraries.
> Would you like to try that explanation again?

Not an explanation, but perhaps a hint at how modules could be tied to objects:

 http://wg21.link/N2074 <http://wg21.link/N2074> (“Plugins in C++”, 2006)


Received on 2019-03-29 14:11:46