Re: [boost] [ublas] FYI: msvc12 compilation errors and some questions

Subject: Re: [boost] [ublas] FYI: msvc12 compilation errors and some questions
From: Adam Wulkiewicz (adam.wulkiewicz_at_[hidden])
Date: 2014-04-25 16:42:32

Beman Dawes wrote:
> On Thu, Apr 17, 2014 at 4:17 PM, Adam Wulkiewicz
> <adam.wulkiewicz_at_[hidden]>wrote:
>
>> Hi,
>>
>> FYI, ublas is broken for MSVC 12 due to the use of constexpr which is not
>> suported by this compiler.
>> I might fix it however I assume there are people who would like to do it.
>>
>> Btw, would you be so kind and answer for some questions? I'm curious about
>> the design.
>>
>> Why BOOST_UBLAS_CPP_GE_2011 library-wide #define is usedto enable
>> fixed_vector<>?
>> This makes it available only on some compilers which allows the users to
>> write non-portable code.
>> Shouldn't Boost libraries use language featureswhen they're available or
>> emulate them rather than enable/disable some functionalities?
>> Especially when it could be easily done, like in this case.
>>
>> Variadic templates may be emulated with Boost.Preprocessor, e.g. see how
>> emplace_back() is implemented in boost::container::vector<> :
>>
>> https://github.com/boostorg/container/blob/develop/
>> include/boost/container/vector.hpp lines 1309-1380.
>>
>> constexpr may be conditionally used e.g. like this:
>>
>> #ifndefBOOST_NO_CXX11_CONSTEXPR
>>
>>      #define  CONSTEXPR_OR_STATIC  constexpr
>>
>> #else
>>
>>      #define  CONSTEXPR_OR_STATIC  static
>>
>> #endifhttp:
>
> See
> http://www.boost.org/doc/libs/1_55_0/libs/config/doc/html/boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_allow_use_of_c__11_features_with_c__03_compilers

uBlas is still broken so I created a ticket: 
https://svn.boost.org/trac/boost/ticket/9954

Regards,
Adam