Re: [Boost-bugs] [Boost C++ Libraries] #11985: range: compiler-error sub_range copy-constructor workaround for MSVC

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11985: range: compiler-error sub_range copy-constructor workaround for MSVC
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-15 09:32:48

#11985: range: compiler-error sub_range copy-constructor workaround for MSVC
-------------------------------+------------------------
  Reporter:  tobias.loew       |      Owner:  neilgroves
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  range
   Version:  Boost 1.61.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+------------------------
Description changed by tobias.loew:

Old description:

> Hi,
>
> the following code generates an error when compiled with MSVC 11 (aka VS
> 2012)
>
>     std::vector<int> arr;
>     arr.push_back(42);
>     boost::sub_range<std::vector<int>> ran = arr;
>     boost::sub_range<std::vector<int>> ran_2 = ran;
>     const boost::sub_range<std::vector<int>>& ran_ref = ran;
>     boost::sub_range<std::vector<int>> ran_3 = ran_ref;
>

> Error: libs\boost\boost\boost\range\iterator_range_core.hpp(69): error
> C2440: 'static_cast' : cannot convert from
> 'std::_Vector_const_iterator<_Myvec>' to 'std::_Vector_iterator<_Myvec>'
>

> the reason is a
> BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1500) )
> in boost/range/sub_range.hpp at line 183
> if I comment out the workaround everything compiles correct.
>
> Tobias

New description:

 Hi,

 the following code generates an error when compiled with MSVC 11 (aka VS
 2012)

 {{{
     std::vector<int> arr;
     arr.push_back(42);
     boost::sub_range<std::vector<int>> ran = arr;
     boost::sub_range<std::vector<int>> ran_2 = ran;
     const boost::sub_range<std::vector<int>>& ran_ref = ran;
     boost::sub_range<std::vector<int>> ran_3 = ran_ref;
 }}}



 Error: libs\boost\boost\boost\range\iterator_range_core.hpp(69): error
 C2440: 'static_cast' : cannot convert from
 'std::_Vector_const_iterator<_Myvec>' to 'std::_Vector_iterator<_Myvec>'


 the reason is a
 BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1500) )
 in boost/range/sub_range.hpp at line 183
 if I comment out the workaround everything compiles correct.

 Tobias

--
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Ticket URL: <https://svn.boost.org/trac/boost/ticket/11985#comment:1>
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