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Subject: Re: [boost] [serialization][ublas][test] failures in serialization causing regressions
From: Robert Ramey (ramey_at_[hidden])
Date: 2016-11-27 17:58:28

On 11/27/16 1:24 PM, Barend Gehrels wrote:
> Hi Robert,
> Op 27-11-2016 om 3:03 schreef Robert Ramey:
>> On 11/26/16 5:23 PM, Robert Ramey wrote:
>>> On 11/26/16 1:31 PM, Barend Gehrels wrote:
>>>>> The regression matrix in develop of Boost.Geometry contains many new >
>>>> compilation failures due to:
>>>>> 1) : D:\t08\run\boost_root\boost/serialization/array.hpp(25) : error
>>>> C2039: 'array' : is not a member of 'std'
>>>>> 2):
>>>>> ../boost/numeric/ublas/storage.hpp: In member function ???void
>>>> boost::numeric::ublas::unbounded_array<T, ALLOC>::serialize(Archive&,
>>>> unsigned int)???:
>>>>> ../boost/numeric/ublas/storage.hpp:331:18: error: ???make_array??? is
>>>> not a member of ???boost::serialization???
>>>>> ar & serialization::make_array(data_, s);and a
>>>>> The master is still OK.
>>>>> Can this be solved?
>>>> Ping! This is still the case!
>>>> Robert, can you explain this?
>>>> It is (of course) not only geometry failing, also ublas or (if there
>>>> are) other libraries with ublas dependencies:
>>>> All yellow!
>>> It looks to me that these test are using std::array and the compiler is
>>> not supporting C++11+
>>> I don't think this has anything to do with the serialization library.
>> OK - I've looked at this a little bit.
>> I made adjustments to more easily support all C++ compilers from C++98
>> to C++14 + and to factor common code from vector, valarray, native
>> arrays, and who knows what else. One of the things this entailed was
>> to put the implementation of an "array_wrapper" in a separate file.
>> This is more general than the concept of an "array". It also includes
>> the definition of "make_array" which perhaps should be called
>> make_array_wrapper.
>> So I think the best would be for ublas / storage to replace
>> #include boost/serialization/array.hpp
>> with
>> #include boost/serialization/array_wrapper.hpp
>> A word of caution - I'm actually not quite done with this but I don't
>> think the array_wapper concept/definition will change so I think it is
>> safe to make this change. Unfortunately, this will mean that
>> serialization and ublas will have to be merged to the master at the
>> same time. I realize that this is not ideal - but still ...
> Thanks for investigating. Your advice to replace it in ublas looks good
> - however, I don't know who is responsible for it and if it will be done
> on short term. Maybe we can prepare a PR for them. And indeed, then we
> have the merge problem. Are there people from Ublas on the list? I
> modified the subject to draw more attention.
> Regards, Barend

Actually I really need to look at this a little more carefully.

Originally boost/serialization/array.hpp was for C++ native arrays.
Now it's morphed to be std::array. Over the years stuff got added: fast
serialization of bit serializable arrays, c++11 <array>, array_wrapper
concept, std::vector, valarray and who knows what else.
I'm generally against modification of the interface but do refactor from
time to time to deal with all this. And of course this is what happens
when people actually start to depend upon the library. As I said, I
need to look at this some more - perhaps it's possible / better to
adjust the contents of boost/serialization/array.hpp.

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