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From: Joaquin M López Muñoz (joaquinlopezmunoz_at_[hidden])
Date: 2020-05-24 16:38:28

El 24/05/2020 a las 14:52, Edward Diener via Boost escribió:
> On 5/24/2020 4:20 AM, Joaquin M López Muñoz via Boost wrote:
>> El 23/05/2020 a las 22:46, Edward Diener via Boost escribió:
>>> I am totally against the idea that some code which works perfectly
>>> in C++03, as well as all
>>> other C++ standard levels, needs to be unnecessarily updated to some
>>> later C++ standard
>>> level in order to be acceptable to anyone.
>> This looks somewhat at odds with one of the stated goals of your
>> cxx_dual lib:
>> "On a more practical basis the CXXD library is for:
>> 1. Programmers writing code not using C++11 syntax who still want to
>>     target some
>>     C++11 libraries if the code is compiled in C++11 mode.
>>     [...]"
> I do not see why you think the statement above is at odds with what I
> previously
> asserted. Whatever might have been added to a Boost library which became a
> C++ standard library in C+11 or beyond could hardly have been done
> just to add
> unnecessary features. I am not against a library being updated to use
> features of
> a later C++ standard when those updates are predicated on improving a
> library
> in specific ways that make it worthwhile to add such features.

I'm not sure I'm parsing your sentences right, but does that mean you're ok
with a library using cxx_dual from scracth but not ok if a Boost-reliant
lib is
later updated via cxx_dual *only* to reduce Boost dependencies in C++11?

> The gist of your proposal which seems to me to be highly flawed is the
> idea
> that at a certain Epoch level all dependencies of a library must also
> exist at that
> same Epoch level or higher. How realistic is such a goal ? If library
> X at Epoch level nnn
> successfully uses library Y at Epoch level nnn-1, why should library Y
> be arbitrarily updated
> [...]

I understand you meant "should library X be arbitrarily updated" here.

> [...]for no good practical reason to use C++ features of Epoch level nnn ?

The reason is to reduce internal Boost dependencies.

> I am pretty sure you can see the absurdity of such a determination as
> that.

I admire your confidence but not your perspicacity, as I indeed see no
absurdity here.

Take for instance Boost.Beast, which depends on boost::string_view but can
be made to depend on std::string_view instead via
Shall I take that you deem this ability absurd?

Joaquín M López Muñoz

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