id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
10514,Cannot copy const sub_range to non-const,Braden McDaniel <braden@…>,Neil Groves,"The following code does not compile with Visual Studio 2013 using Boost 1.56.0:
{{{
#!c++
typedef std::vector<int> vec_t;
typedef boost::sub_range<vec_t> range_t;
vec_t vec(10);
range_t r(vec.begin(), vec.end());
const range_t & r_ref = r;
range_t v = r_ref;
}}}
The following error results:
{{{
boost/range/iterator_range_core.hpp(69) : error C2440: 'static_cast' : cannot convert from 'std::_Vector_const_iterator<std::_Vector_val<std::_Simple_types<int>>>' to 'std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>'
        No constructor could take the source type, or constructor overload resolution was ambiguous
        c:\build\ng-10.5-x64\API\inc\boost/range/sub_range.hpp(184) : see reference to function template instantiation 'IteratorT boost::iterator_range_detail::iterator_range_impl<IteratorT>::adl_begin<const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag>>(const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag> &)' being compiled
        with
        [
            IteratorT=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>
,            ForwardRange=vec_t
        ]
        c:\build\ng-10.5-x64\API\inc\boost/range/sub_range.hpp(187) : see reference to function template instantiation 'IteratorT boost::iterator_range_detail::iterator_range_impl<IteratorT>::adl_begin<const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag>>(const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag> &)' being compiled
        with
        [
            IteratorT=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>
,            ForwardRange=vec_t
        ]
        c:\build\ng-10.5-x64\API\inc\boost/range/sub_range.hpp(184) : while compiling class template member function 'boost::sub_range<vec_t>::sub_range(const boost::sub_range<vec_t> &)'
        sub_range_test.cpp(11) : see reference to function template instantiation 'boost::sub_range<vec_t>::sub_range(const boost::sub_range<vec_t> &)' being compiled
        sub_range_test.cpp(9) : see reference to class template instantiation 'boost::sub_range<vec_t>' being compiled
boost/range/iterator_range_core.hpp(75) : error C2440: 'static_cast' : cannot convert from 'std::_Vector_const_iterator<std::_Vector_val<std::_Simple_types<int>>>' to 'std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>'
        No constructor could take the source type, or constructor overload resolution was ambiguous
        c:\build\ng-10.5-x64\API\inc\boost/range/sub_range.hpp(186) : see reference to function template instantiation 'IteratorT boost::iterator_range_detail::iterator_range_impl<IteratorT>::adl_end<const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag>>(const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag> &)' being compiled
        with
        [
            IteratorT=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>
,            ForwardRange=vec_t
        ]
        c:\build\ng-10.5-x64\API\inc\boost/range/sub_range.hpp(187) : see reference to function template instantiation 'IteratorT boost::iterator_range_detail::iterator_range_impl<IteratorT>::adl_end<const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag>>(const boost::range_detail::sub_range_base<ForwardRange,boost::random_access_traversal_tag> &)' being compiled
        with
        [
            IteratorT=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>
,            ForwardRange=vec_t
        ]
}}}
So it looks as though having a `const` `sub_range` implies that it uses `const_iterator`s, which doesn't seem appropriate.

Code of this nature compiled using Boost 1.55.0.
",Bugs,new,To Be Determined,range,Boost 1.56.0,Regression,,,