In file included from test.cpp:4:
In file included from /usr/include/boost/multi_index/key_extractors.hpp:16:
/usr/include/boost/multi_index/composite_key.hpp:624:23: error: indirection requires pointer operand ('const element' invalid)
    return operator()(*x);
                      ^~
/usr/include/boost/multi_index/composite_key.hpp:624:12: note: in instantiation of function template specialization 'boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::operator()<element>' requested here
    return operator()(*x);
           ^
/usr/include/boost/multi_index/detail/ord_index_impl.hpp:712:20: note: in instantiation of function template specialization 'boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::operator()<std::unique_ptr<element, std::default_delete<element> > >' requested here
    if(!link_point(key(v),inf,Category())){
                   ^
/usr/include/boost/multi_index_container.hpp:558:27: note: in instantiation of function template specialization 'boost::multi_index::detail::ordered_index_impl<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, std::less<boost::multi_index::composite_key_result<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::multi_index::detail::nth_layer<1, std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >, boost::mpl::vector0<mpl_::na>, boost::multi_index::detail::ordered_unique_tag, boost::multi_index::detail::null_augment_policy>::insert_<boost::multi_index::detail::rvalue_tag>' requested here
    node_type* res=super::insert_(v,x,variant);
                          ^
/usr/include/boost/multi_index_container.hpp:575:12: note: in instantiation of function template specialization 'boost::multi_index::multi_index_container<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::insert_<boost::multi_index::detail::rvalue_tag>' requested here
    return insert_(v,detail::rvalue_tag());
           ^
/usr/include/boost/multi_index/detail/index_base.hpp:221:21: note: in instantiation of member function 'boost::multi_index::multi_index_container<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::insert_rv_' requested here
    {return final().insert_rv_(x);}
                    ^
/usr/include/boost/multi_index/detail/ord_index_impl.hpp:302:46: note: in instantiation of member function 'boost::multi_index::detail::index_base<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::final_insert_rv_' requested here
    std::pair<final_node_type*,bool> p=this->final_insert_rv_(x);
                                             ^
test.cpp:34:10: note: in instantiation of member function 'boost::multi_index::detail::ordered_index_impl<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, std::less<boost::multi_index::composite_key_result<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::multi_index::detail::nth_layer<1, std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >, boost::mpl::vector0<mpl_::na>, boost::multi_index::detail::ordered_unique_tag, boost::multi_index::detail::null_augment_policy>::insert' requested here
  a.ints.insert(std::make_unique<element>(5, 4.0));
         ^
In file included from test.cpp:4:
In file included from /usr/include/boost/multi_index/key_extractors.hpp:19:
/usr/include/boost/multi_index/member.hpp:60:23: error: indirection requires pointer operand ('const boost::multi_index::member<element, const int, &element::x>' invalid)
    return operator()(*x);
                      ^~
/usr/include/boost/multi_index/composite_key.hpp:377:24: note: in instantiation of function template specialization 'boost::multi_index::detail::const_member_base<element, const float, &element::y>::operator()<boost::multi_index::member<element, const int, &element::x> >' requested here
    if(comp.get_head()(c0.get_head()(v0),c1.get_head()(v1)))return true;
                       ^
/usr/include/boost/multi_index/composite_key.hpp:1135:8: note: in instantiation of member function 'boost::multi_index::detail::compare_ckey_ckey_normal<boost::tuples::tuple<boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::multi_index::member<element, const int, &element::x>, boost::tuples::tuple<boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::multi_index::member<element, const int, &element::x>, boost::tuples::tuple<std::less<const float>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::compare' requested here
    >::compare(
       ^
/usr/include/boost/multi_index/detail/ord_index_impl.hpp:1014:9: note: in instantiation of function template specialization 'boost::multi_index::composite_key_compare<std::less<const float>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::operator()<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >' requested here
      c=comp_(k,key(x->value()));
        ^
/usr/include/boost/multi_index/detail/ord_index_impl.hpp:712:9: note: in instantiation of member function 'boost::multi_index::detail::ordered_index_impl<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, std::less<boost::multi_index::composite_key_result<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::multi_index::detail::nth_layer<1, std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >, boost::mpl::vector0<mpl_::na>, boost::multi_index::detail::ordered_unique_tag, boost::multi_index::detail::null_augment_policy>::link_point' requested here
    if(!link_point(key(v),inf,Category())){
        ^
/usr/include/boost/multi_index_container.hpp:558:27: note: in instantiation of function template specialization 'boost::multi_index::detail::ordered_index_impl<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, std::less<boost::multi_index::composite_key_result<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::multi_index::detail::nth_layer<1, std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >, boost::mpl::vector0<mpl_::na>, boost::multi_index::detail::ordered_unique_tag, boost::multi_index::detail::null_augment_policy>::insert_<boost::multi_index::detail::rvalue_tag>' requested here
    node_type* res=super::insert_(v,x,variant);
                          ^
/usr/include/boost/multi_index_container.hpp:575:12: note: in instantiation of function template specialization 'boost::multi_index::multi_index_container<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::insert_<boost::multi_index::detail::rvalue_tag>' requested here
    return insert_(v,detail::rvalue_tag());
           ^
/usr/include/boost/multi_index/detail/index_base.hpp:221:21: note: in instantiation of member function 'boost::multi_index::multi_index_container<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::insert_rv_' requested here
    {return final().insert_rv_(x);}
                    ^
/usr/include/boost/multi_index/detail/ord_index_impl.hpp:302:46: note: in instantiation of member function 'boost::multi_index::detail::index_base<std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >::final_insert_rv_' requested here
    std::pair<final_node_type*,bool> p=this->final_insert_rv_(x);
                                             ^
test.cpp:34:10: note: in instantiation of member function 'boost::multi_index::detail::ordered_index_impl<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, std::less<boost::multi_index::composite_key_result<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::multi_index::detail::nth_layer<1, std::unique_ptr<element, std::default_delete<element> >, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::composite_key<boost::multi_index::member<element, const int, &element::x>, boost::multi_index::member<element, const float, &element::y>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, mpl_::na, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, std::allocator<std::unique_ptr<element, std::default_delete<element> > > >, boost::mpl::vector0<mpl_::na>, boost::multi_index::detail::ordered_unique_tag, boost::multi_index::detail::null_augment_policy>::insert' requested here
  a.ints.insert(std::make_unique<element>(5, 4.0));
         ^
2 errors generated.