[Boost-users] boost::any_range with an abstract class reference

Subject: [Boost-users] boost::any_range with an abstract class reference
From: voivoid (voivoid_at_[hidden])
Date: 2013-08-19 03:35:34

Consider the following code:

#include <vector>
#include <boost\range\any_range.hpp>
#include <boost\range\adaptors.hpp>

struct IFooBar {
  virtual void func() = 0;
};

typedef boost::any_range<IFooBar,
                                        boost::random_access_traversal_tag,
                                        const IFooBar&amp;,
                                        std::ptrdiff_t> FooBarRange;

int main() {
  std::vector<std::unique_ptr&lt;IFooBar>> vec;
  FooBarRange range = vec | boost::adaptors::indirected;

  return 0;
}

Compilation fails with the following error ( looks like any_range value is
supposed to be copy-constructable? )
Is there any workaround?

boost_1_54_0, MSVC 2010

1>c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator_interface.hpp(90):
error C2259: 'IFooBar' : cannot instantiate abstract class
1>          due to following members:
1>          'void IFooBar::func(void)' : is abstract
1>          c:\users\voivoid\projects\cpptestapp\cpptestapp\main.cpp(9) :
see declaration of 'IFooBar::func'
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator_interface.hpp(93)
: see reference to class template instantiation
'boost::range_detail::any_single_pass_iterator_interface<Reference,Buffer>'
being compiled
1>          with
1>          [
1>              Reference=IFooBar,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator_interface.hpp(101)
: see reference to class template instantiation
'boost::range_detail::any_single_pass_iterator_interface<Reference,Buffer>'
being compiled
1>          with
1>          [
1>              Reference=const IFooBar &,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator_interface.hpp(123)
: see reference to class template instantiation
'boost::range_detail::any_forward_iterator_interface<Reference,Buffer>'
being compiled
1>          with
1>          [
1>              Reference=const IFooBar &,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator_interface.hpp(151)
: see reference to class template instantiation
'boost::range_detail::any_bidirectional_iterator_interface<Reference,Buffer>'
being compiled
1>          with
1>          [
1>              Reference=const IFooBar &,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\detail\any_iterator.hpp(452)
: see reference to class template instantiation
'boost::range_detail::any_random_access_iterator_interface<Reference,Difference,Buffer>'
being compiled
1>          with
1>          [
1>              Reference=const IFooBar &,
1>              Difference=ptrdiff_t,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>          c:\program files (x86)\microsoft visual studio
10.0\vc\include\xutility(385) : see reference to class template
instantiation
'boost::range_detail::any_iterator<Value,Traversal,Reference,Difference,Buffer>'
being compiled
1>          with
1>          [
1>              Value=IFooBar,
1>              Traversal=boost::random_access_traversal_tag,
1>              Reference=const IFooBar &,
1>              Difference=ptrdiff_t,
1>              Buffer=boost::any_iterator_buffer<64>
1>          ]
1>          c:\users\voivoid\libs\boost_1_54_0\boost\detail\iterator.hpp(83)
: see reference to class template instantiation
'std::iterator_traits<_Iter>' being compiled
1>          with
1>          [
1>             
_Iter=boost::range_detail::any_iterator<IFooBar,boost::random_access_traversal_tag,const
IFooBar &amp;,ptrdiff_t,boost::any_iterator_buffer&lt;64>>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\iterator\iterator_traits.hpp(30) :
see reference to class template instantiation
'boost::detail::iterator_traits<Iterator>' being compiled
1>          with
1>          [
1>             
Iterator=boost::range_detail::any_iterator<IFooBar,boost::random_access_traversal_tag,const
IFooBar &amp;,ptrdiff_t,boost::any_iterator_buffer&lt;64>>
1>          ]
1>         
c:\users\voivoid\libs\boost_1_54_0\boost\range\iterator_range_core.hpp(141)
: see reference to class template instantiation
'boost::iterator_value<Iterator>' being compiled
1>          with
1>          [
1>             
Iterator=boost::range_detail::any_iterator<IFooBar,boost::random_access_traversal_tag,const
IFooBar &amp;,ptrdiff_t,boost::any_iterator_buffer&lt;64>>
1>          ]
1>          c:\users\voivoid\libs\boost_1_54_0\boost\range\any_range.hpp(95)
: see reference to class template instantiation
'boost::iterator_range<IteratorT>' being compiled
1>          with
1>          [
1>             
IteratorT=boost::range_detail::any_iterator<IFooBar,boost::random_access_traversal_tag,const
IFooBar &amp;,ptrdiff_t,boost::any_iterator_buffer&lt;64>>
1>          ]
1>          c:\users\voivoid\projects\cpptestapp\cpptestapp\main.cpp(19) :
see reference to class template instantiation
'boost::range_detail::any_range<Value,Traversal,Reference,Difference>' being
compiled
1>          with
1>          [
1>              Value=IFooBar,
1>              Traversal=boost::random_access_traversal_tag,
1>              Reference=const IFooBar &,
1>              Difference=ptrdiff_t
1>          ]

Thanks.

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