id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11248	Some algorithms with requirement for SinglePassRange accept range only by const reference	Taras Kozlov <kozlov.taras@…>	Neil Groves	"I came up with it when tried to use generator made by boost.coroutine with boost range algorithms.
The following code doesn't compile with MSVC 2012

{{{
#include <boost/range/distance.hpp>
#include <boost/coroutine/all.hpp>

using namespace boost::range;
using namespace boost::coroutines;

asymmetric_coroutine<int>::pull_type make_dummy_range()
{
    return asymmetric_coroutine<int>::pull_type([](asymmetric_coroutine<int>::push_type& yield)
    {
        yield(1);
    });
}


int _tmain(int argc, _TCHAR* argv[])
{
    boost::distance(make_dummy_range()); // error
    return 0;
}

}}}

with error


{{{
D:\Work\3rdparty\boost_1_58_0\boost/concept_check.hpp(181): error C2079: 'boost::CopyConstructible<TT>::b' uses undefined struct 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              TT=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          and
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(124) : see reference to class template instantiation 'boost::CopyConstructible<TT>' being compiled
1>          with
1>          [
1>              TT=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(147) : see reference to class template instantiation 'boost::range_detail::IncrementableIteratorConcept<Iterator>' being compiled
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/concept/detail/msvc.hpp(29) : see reference to class template instantiation 'boost::range_detail::SinglePassIteratorConcept<Iterator>' being compiled
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/concept/detail/msvc.hpp(28) : while compiling class template member function 'void boost::concepts::check<Model>::failed(Model *)'
1>          with
1>          [
1>              Model=boost::range_detail::SinglePassIteratorConcept<boost::coroutines::pull_coroutine<int>::const_iterator>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/concept/detail/msvc.hpp(66) : see reference to class template instantiation 'boost::concepts::check<Model>' being compiled
1>          with
1>          [
1>              Model=boost::range_detail::SinglePassIteratorConcept<boost::coroutines::pull_coroutine<int>::const_iterator>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(279) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled
1>          with
1>          [
1>              Model=boost::range_detail::SinglePassIteratorConcept<boost::coroutines::pull_coroutine<int>::const_iterator>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/concept/detail/has_constraints.hpp(42) : see reference to class template instantiation 'boost::SinglePassRangeConcept<T>' being compiled
1>          with
1>          [
1>              T=boost::coroutines::pull_coroutine<int>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/concept/detail/msvc.hpp(58) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled
1>          with
1>          [
1>              Model=boost::SinglePassRangeConcept<boost::coroutines::pull_coroutine<int>>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/algorithm/for_each.hpp(72) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled
1>          with
1>          [
1>              Model=boost::SinglePassRangeConcept<boost::coroutines::pull_coroutine<int>>
1>          ]
1>          coroutine_bug.cpp(29) : see reference to function template instantiation 'UnaryFunction boost::range::for_each<boost::coroutines::pull_coroutine<R>,wmain::<lambda_d9c6ee6ee85186807f477d3ab241bdd7>>(SinglePassRange &,UnaryFunction)' being compiled
1>          with
1>          [
1>              UnaryFunction=wmain::<lambda_d9c6ee6ee85186807f477d3ab241bdd7>,
1>              R=int,
1>              SinglePassRange=boost::coroutines::pull_coroutine<int>
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364): error C2027: use of undefined type 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/coroutine/asymmetric_coroutine.hpp(812) : see declaration of 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/iterator/iterator_categories.hpp(119) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(126) : see reference to class template instantiation 'boost::iterators::iterator_traversal<Iterator>' being compiled
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364): error C2146: syntax error : missing ';' before identifier 'iterator_category'
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364): error C2602: 'std::iterator_traits<_Iter>::iterator_category' is not a member of a base class of 'std::iterator_traits<_Iter>'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364) : see declaration of 'std::iterator_traits<_Iter>::iterator_category'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(364): error C2868: 'std::iterator_traits<_Iter>::iterator_category' : illegal syntax for using-declaration; expected qualified-name
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365): error C2027: use of undefined type 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/coroutine/asymmetric_coroutine.hpp(812) : see declaration of 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365): error C2146: syntax error : missing ';' before identifier 'value_type'
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365): error C2602: 'std::iterator_traits<_Iter>::value_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365) : see declaration of 'std::iterator_traits<_Iter>::value_type'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(365): error C2868: 'std::iterator_traits<_Iter>::value_type' : illegal syntax for using-declaration; expected qualified-name
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366): error C2027: use of undefined type 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/coroutine/asymmetric_coroutine.hpp(812) : see declaration of 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366): error C2146: syntax error : missing ';' before identifier 'difference_type'
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366): error C2602: 'std::iterator_traits<_Iter>::difference_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366) : see declaration of 'std::iterator_traits<_Iter>::difference_type'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(366): error C2868: 'std::iterator_traits<_Iter>::difference_type' : illegal syntax for using-declaration; expected qualified-name
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368): error C2027: use of undefined type 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/coroutine/asymmetric_coroutine.hpp(812) : see declaration of 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368): error C2146: syntax error : missing ';' before identifier 'pointer'
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368): error C2602: 'std::iterator_traits<_Iter>::pointer' is not a member of a base class of 'std::iterator_traits<_Iter>'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368) : see declaration of 'std::iterator_traits<_Iter>::pointer'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(368): error C2868: 'std::iterator_traits<_Iter>::pointer' : illegal syntax for using-declaration; expected qualified-name
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369): error C2027: use of undefined type 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/coroutine/asymmetric_coroutine.hpp(812) : see declaration of 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              R=int
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369): error C2146: syntax error : missing ';' before identifier 'reference'
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369): error C2602: 'std::iterator_traits<_Iter>::reference' is not a member of a base class of 'std::iterator_traits<_Iter>'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369) : see declaration of 'std::iterator_traits<_Iter>::reference'
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xutility(369): error C2868: 'std::iterator_traits<_Iter>::reference' : illegal syntax for using-declaration; expected qualified-name
1>          with
1>          [
1>              _Iter=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41): error C2516: 'boost::mpl::if_<T1,T2,T3>::type' : is not a legal base class
1>          with
1>          [
1>              T1=boost::is_convertible<int,std::output_iterator_tag>,
1>              T2=boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,
1>              T3=void
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/if.hpp(70) : see declaration of 'boost::mpl::if_<T1,T2,T3>::type'
1>          with
1>          [
1>              T1=boost::is_convertible<int,std::output_iterator_tag>,
1>              T2=boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,
1>              T3=void
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,std::output_iterator_tag>,
1>              F1=boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,
1>              F2=void
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,std::input_iterator_tag>,
1>              F1=boost::mpl::identity<boost::iterators::single_pass_traversal_tag>,
1>              F2=boost::mpl::eval_if<boost::is_convertible<int,std::output_iterator_tag>,boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,void>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,std::forward_iterator_tag>,
1>              F1=boost::mpl::identity<boost::iterators::forward_traversal_tag>,
1>              F2=boost::mpl::eval_if<boost::is_convertible<int,std::input_iterator_tag>,boost::mpl::identity<boost::iterators::single_pass_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::output_iterator_tag>,boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,void>>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,std::bidirectional_iterator_tag>,
1>              F1=boost::mpl::identity<boost::iterators::bidirectional_traversal_tag>,
1>              F2=boost::mpl::eval_if<boost::is_convertible<int,std::forward_iterator_tag>,boost::mpl::identity<boost::iterators::forward_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::input_iterator_tag>,boost::mpl::identity<boost::iterators::single_pass_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::output_iterator_tag>,boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,void>>>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/iterator/iterator_categories.hpp(99) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,std::random_access_iterator_tag>,
1>              F1=boost::mpl::identity<boost::iterators::random_access_traversal_tag>,
1>              F2=boost::mpl::eval_if<boost::is_convertible<int,std::bidirectional_iterator_tag>,boost::mpl::identity<boost::iterators::bidirectional_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::forward_iterator_tag>,boost::mpl::identity<boost::iterators::forward_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::input_iterator_tag>,boost::mpl::identity<boost::iterators::single_pass_traversal_tag>,boost::mpl::eval_if<boost::is_convertible<int,std::output_iterator_tag>,boost::mpl::identity<boost::iterators::incrementable_traversal_tag>,void>>>>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::iterators::detail::old_category_to_traversal<Cat>' being compiled
1>          with
1>          [
1>              Cat=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/iterator/iterator_categories.hpp(113) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled
1>          with
1>          [
1>              C=boost::is_convertible<int,boost::iterators::incrementable_traversal_tag>,
1>              F1=boost::mpl::identity<int>,
1>              F2=boost::iterators::detail::old_category_to_traversal<int>
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/iterator/iterator_categories.hpp(121) : see reference to class template instantiation 'boost::iterators::iterator_category_to_traversal<Cat>' being compiled
1>          with
1>          [
1>              Cat=int
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(126): error C2039: 'type' : is not a member of 'boost::iterators::iterator_traversal<Iterator>'
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(126): error C2146: syntax error : missing ';' before identifier 'traversal_category'
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(126): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(128): error C2065: 'traversal_category' : undeclared identifier
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(128): error C2923: 'boost::Convertible' : 'traversal_category' is not a valid template type argument for parameter 'X'
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(128): error C2893: Failed to specialize function template 'boost::concepts::require<Model> boost::concepts::require_(void (__cdecl *)(Model))'
1>          With the following template arguments:
1>          'boost::Convertible'
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(128): error C2056: illegal expression
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(140): error C2079: 'boost::range_detail::IncrementableIteratorConcept<Iterator>::i' uses undefined struct 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          and
1>          [
1>              R=int
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/concept_check.hpp(239): error C2079: 'boost::EqualityComparable<TT>::a' uses undefined struct 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              TT=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          and
1>          [
1>              R=int
1>          ]
1>          D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(148) : see reference to class template instantiation 'boost::EqualityComparable<TT>' being compiled
1>          with
1>          [
1>              TT=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/concept_check.hpp(239): error C2079: 'boost::EqualityComparable<TT>::b' uses undefined struct 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              TT=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          and
1>          [
1>              R=int
1>          ]
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(150): error C2146: syntax error : missing ',' before identifier 'traversal_category'
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(150): error C2065: 'traversal_category' : undeclared identifier
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(150): error C2893: Failed to specialize function template 'boost::concepts::require<Model> boost::concepts::require_(void (__cdecl *)(Model))'
1>          With the following template arguments:
1>          'boost::Convertible'
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(150): error C2056: illegal expression
1>D:\Work\3rdparty\boost_1_58_0\boost/range/concepts.hpp(174): error C2079: 'boost::range_detail::SinglePassIteratorConcept<Iterator>::i' uses undefined struct 'boost::coroutines::pull_coroutine<R>::const_iterator'
1>          with
1>          [
1>              Iterator=boost::coroutines::pull_coroutine<int>::const_iterator
1>          ]
1>          and
1>          [
1>              R=int
1>          ]
1>
1>Build FAILED.
1>

}}}

Generator models SinglePassRange and modify itself will iterating, but distance accept range only by const reference

{{{
    template< class T >
    inline BOOST_DEDUCED_TYPENAME range_difference<T>::type 
    distance( const T& r )
    {
        return std::distance( boost::begin( r ), boost::end( r ) );
    }
}}}

I checked other algorithms and found that some of them have non const reference overload (for example count)

{{{
template<class SinglePassRange, class Value>
typename range_difference<SinglePassRange>::type
count(SinglePassRange& rng, const Value& val);

template<class SinglePassRange, class Value>
typename range_difference<const SinglePassRange>::type
count(const SinglePassRange& rng, const Value& val);
}}}

I tried count instead of distance and I was suprised that it doesn't compile too. 

{{{
asymmetric_coroutine<int>::pull_type make_dummy_range()
{
    return asymmetric_coroutine<int>::pull_type([](asymmetric_coroutine<int>::push_type& yield)
    {
        yield(1);
    });
}

int _tmain(int argc, _TCHAR* argv[])
{
    asymmetric_coroutine<int>::pull_type r = make_dummy_range();
    boost::count(r, 1); //still complains on const_iterator
    return 0;
}
}}}

I don't understand why MSVC12 compiler still prefer const ref overload
{{{
template<class SinglePassRange, class Value>
typename range_difference<const SinglePassRange>::type
count(const SinglePassRange& rng, const Value& val);
}}}

but it is"	Bugs	new	To Be Determined	range	Boost 1.57.0	Problem