Re: [Boost-users] boost::ptr_vector::sort with c++11 lambdas

Thorsten Ottosen writes:

The first one is the correct one. But I think the problem is with indirect_fun, or the code surrounding it. Does this work:

auto x = <lambda>;

boost::indirect_fun fun(x);

?

-Thorsten

int _tmain(int argc, _TCHAR* argv[]) { boost::ptr_vector<A> lst; // lst.sort([&] (const A& v1, const A& v2) ->bool {return false;}); auto x = [] (const A* v1, const A* v2) ->bool {return false;}; boost::indirect_fun fun(x); lst.sort(fun); return 0; } The error message is the same. Complete output is shown below: 1>ClCompile: 1>c:\libraries\boost\boost_1_47_0\boost\utility\result_of.hpp(79): error C2903: 'result' : symbol is neither a class template nor a function template 1> c:\libraries\boost\boost_1_47_0\boost\utility\result_of.hpp(87) : see reference to class template instantiation 'boost::detail::result_of_nested_result' being compiled 1> with 1> [ 1> F=const boost::indirect_fun<`anonymous-namespace'::<lambda0>>, 1> FArgs=const boost::indirect_fun<`anonymous- namespace'::<lambda0>> (const A &,const A &) 1> ] 1> c:\libraries\boost\boost_1_47_0 \boost\utility\detail\result_of_iterate.hpp(33) : see reference to class template instantiation 'boost::detail::tr1_result_of_impl' being compiled 1> with 1> [ 1> F=const boost::indirect_fun<`anonymous-namespace'::<lambda0>>, 1> FArgs=const boost::indirect_fun<`anonymous- namespace'::<lambda0>> (const A &,const A &), 1> HasResultType=false 1> ] 1> c:\libraries\boost\boost_1_47_0 \boost\utility\detail\result_of_iterate.hpp(81) : see reference to class template instantiation 'boost::tr1_result_of<F>' being compiled 1> with 1> [ 1> F=const boost::indirect_fun<`anonymous-namespace'::<lambda0>> (const A &,const A &) 1> ] 1> c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp (41) : see reference to class template instantiation 'boost::result_of<F>' being compiled 1> with 1> [ 1> F=const boost::indirect_fun<`anonymous-namespace'::<lambda0>> (const A &,const A &) 1> ] 1> c:\program files (x86)\microsoft visual studio 10.0 \vc\include\algorithm(3720) : see reference to class template instantiation 'boost::ptr_container_detail::make_lazy' being compiled 1> with 1> [ 1> Type=boost::result_of (const A &,const A &)>, 1> Dummy=void 1> ] 1> c:\program files (x86)\microsoft visual studio 10.0 \vc\include\algorithm(3776) : see reference to function template instantiation 'std::pair<_Ty1,_Ty2> std::_Unguarded_partition<_RanIt,_Pr> (_RanIt,_RanIt,_Pr)' being compiled 1> with 1> [ 1> _Ty1=void **, 1> _Ty2=void **, 1> _RanIt=void **, 1> _Pr=boost::void_ptr_indirect_fun,A> 1> ] 1> c:\program files (x86)\microsoft visual studio 10.0 \vc\include\algorithm(3806) : see reference to function template instantiation 'void std::_Sort(_RanIt,_RanIt,_Diff,_Pr)' being compiled 1> with 1> [ 1> _Pr=boost::void_ptr_indirect_fun,A>, 1> _RanIt=void **, 1> _Diff=__w64 int 1> ] 1> c:\libraries\boost\boost_1_47_0 \boost\ptr_container\ptr_sequence_adapter.hpp(601) : see reference to function template instantiation 'void std::sort>(_RanIt,_RanIt,_Pr)' being compiled 1> with 1> [ 1> VoidIter=std::_Vector_iterator>>, 1> Fun=boost::indirect_fun<`anonymous-namespace'::<lambda0>>, 1> Arg1=A, 1> _RanIt=std::_Vector_iterator>>, 1> _Pr=boost::void_ptr_indirect_fun,A> 1> ] 1> c:\libraries\boost\boost_1_47_0 \boost\ptr_container\ptr_sequence_adapter.hpp(607) : see reference to function template instantiation 'void boost::ptr_sequence_adapter::sort<Compare> (boost::void_ptr_iterator,boost::void_ptr_iterator,Compa re)' being compiled 1> with 1> [ 1> T=A, 1> VoidPtrSeq=std::vector>, 1> CloneAllocator=boost::heap_clone_allocator, 1> Compare=boost::indirect_fun<`anonymous-namespace'::<lambda0>>, 1> VoidIter=std::_Vector_iterator>> 1> ] 1> c:\test\ptr_pointer_lambda\ptr_pointer_lambda\ptr_pointer_lambda.cpp (23) : see reference to function template instantiation 'void boost::ptr_sequence_adapter::sort(Compare)' being compiled 1> with 1> [ 1> T=A, 1> VoidPtrSeq=std::vector>, 1> CloneAllocator=boost::heap_clone_allocator, 1> Fun=`anonymous-namespace'::<lambda0>, 1> Compare=boost::indirect_fun<`anonymous-namespace'::<lambda0>> 1> ] 1>c:\libraries\boost\boost_1_47_0\boost\utility\result_of.hpp(79): error C2039: 'result' : is not a member of 'boost::indirect_fun<Fun>' 1> with 1> [ 1> Fun=`anonymous-namespace'::<lambda0> 1> ] 1>c:\libraries\boost\boost_1_47_0\boost\utility\result_of.hpp(79): error C2504: 'result' : base class undefined 1>c:\libraries\boost\boost_1_47_0\boost\utility\result_of.hpp(79): error C2143: syntax error : missing ',' before '<' 1>c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp(41): error C2039: 'type' : is not a member of 'boost::result_of<F>' 1> with 1> [ 1> F=const boost::indirect_fun<`anonymous-namespace'::<lambda0>> (const A &,const A &) 1> ] 1>c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp(41): error C2146: syntax error : missing ';' before identifier 'type' 1>c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp(41): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp(41): error C2602: 'boost::ptr_container_detail::make_lazy::type' is not a member of a base class of 'boost::ptr_container_detail::make_lazy' 1> with 1> [ 1> Type=boost::result_of (const A &,const A &)>, 1> Dummy=void 1> ] 1> c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp (41) : see declaration of 'boost::ptr_container_detail::make_lazy::type' 1> with 1> [ 1> Type=boost::result_of (const A &,const A &)>, 1> Dummy=void 1> ] 1>c:\libraries\boost\boost_1_47_0\boost\ptr_container\indirect_fun.hpp(41): error C2868: 'boost::ptr_container_detail::make_lazy::type' : illegal syntax for using-declaration; expected qualified-name 1> with 1> [ 1> Type=boost::result_of (const A &,const A &)>, 1> Dummy=void 1> ]