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#include <iostream>
#include <unordered_map>
#include <string>
#include <functional>
 
struct Object;
typedef std::unordered_map<std::string, std::function<Object*(std::string *args)>> stdtypefunc_map;
 
struct Object
{
 
};
 
struct StdType : public Object
{
    stdtypefunc_map functions;
};
 
struct stringtype : public StdType
{
    stringtype()
    {
        functions.emplace("GetValue", &stringtype::GetValue);
    }
 
    Object* GetValue(std::string args[])
    {
        std::cout << "GetValue()" << std::endl;
    }
};
 
int main()
{
    stringtype s;
	return 0;
}

In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h: In instantiation of ‘void __gnu_cxx::new_allocator<_Tp>::construct(_Up*, _Args&& ...) [with _Up = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >; _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _Tp = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >]’:
/usr/include/c++/6/bits/alloc_traits.h:455:4:   required from ‘static void std::allocator_traits<std::allocator<_CharT> >::construct(std::allocator_traits<std::allocator<_CharT> >::allocator_type&, _Up*, _Args&& ...) [with _Up = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >; _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _Tp = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >; std::allocator_traits<std::allocator<_CharT> >::allocator_type = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> > >]’
/usr/include/c++/6/bits/hashtable_policy.h:1953:37:   required from ‘std::__detail::_Hashtable_alloc<_NodeAlloc>::__node_type* std::__detail::_Hashtable_alloc<_NodeAlloc>::_M_allocate_node(_Args&& ...) [with _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _NodeAlloc = std::allocator<std::__detail::_Hash_node<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >, true> >; std::__detail::_Hashtable_alloc<_NodeAlloc>::__node_type = std::__detail::_Hash_node<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >, true>]’
/usr/include/c++/6/bits/hashtable.h:1513:77:   required from ‘std::pair<typename std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::iterator, bool> std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_M_emplace(std::true_type, _Args&& ...) [with _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _Key = std::__cxx11::basic_string<char>; _Value = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::__cxx11::basic_string<char> >; _H1 = std::hash<std::__cxx11::basic_string<char> >; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>; typename std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::iterator = std::__detail::_Node_iterator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >, false, true>; std::true_type = std::integral_constant<bool, true>]’
/usr/include/c++/6/bits/hashtable.h:728:69:   required from ‘std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::__ireturn_type std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::emplace(_Args&& ...) [with _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _Key = std::__cxx11::basic_string<char>; _Value = std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> > >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<std::__cxx11::basic_string<char> >; _H1 = std::hash<std::__cxx11::basic_string<char> >; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>; std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::__ireturn_type = std::pair<std::__detail::_Node_iterator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >, false, true>, bool>]’
/usr/include/c++/6/bits/unordered_map.h:380:54:   required from ‘std::pair<typename std::_Hashtable<_Key, std::pair<const _Key, _Tp>, _Alloc, std::__detail::_Select1st, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__detail::__is_noexcept_hash<_Key, _Hash> > >::value, false, true> >::iterator, bool> std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::emplace(_Args&& ...) [with _Args = {const char (&)[9], Object* (stringtype::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)}; _Key = std::__cxx11::basic_string<char>; _Tp = std::function<Object*(std::__cxx11::basic_string<char>*)>; _Hash = std::hash<std::__cxx11::basic_string<char> >; _Pred = std::equal_to<std::__cxx11::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> > >; typename std::_Hashtable<_Key, std::pair<const _Key, _Tp>, _Alloc, std::__detail::_Select1st, _Pred, _Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<std::__not_<std::__and_<std::__is_fast_hash<_Hash>, std::__detail::__is_noexcept_hash<_Key, _Hash> > >::value, false, true> >::iterator = std::__detail::_Node_iterator<std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >, false, true>]’
prog.cpp:23:60:   required from here
/usr/include/c++/6/ext/new_allocator.h:120:4: error: no matching function for call to ‘std::pair<const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::pair(const char [9], Object* (stringtype::*)(std::__cxx11::basic_string<char>*))’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:423:9: note: candidate: template<class ... _Args1, long unsigned int ..._Indexes1, class ... _Args2, long unsigned int ..._Indexes2> std::pair<_T1, _T2>::pair(std::tuple<_Args1 ...>&, std::tuple<_Args2 ...>&, std::_Index_tuple<_Indexes1 ...>, std::_Index_tuple<_Indexes2 ...>)
         pair(tuple<_Args1...>&, tuple<_Args2...>&,
         ^~~~
/usr/include/c++/6/bits/stl_pair.h:423:9: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘std::tuple<_Elements ...>’ and ‘const char [9]’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:356:9: note: candidate: template<class ... _Args1, class ... _Args2> std::pair<_T1, _T2>::pair(std::piecewise_construct_t, std::tuple<_Args1 ...>, std::tuple<_Args2 ...>)
         pair(piecewise_construct_t, tuple<_Args1...>, tuple<_Args2...>);
         ^~~~
/usr/include/c++/6/bits/stl_pair.h:356:9: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘std::tuple<_Elements ...>’ and ‘Object* (stringtype::*)(std::__cxx11::basic_string<char>*)’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:351:21: note: candidate: template<class _U1, class _U2, typename std::enable_if<(std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_MoveConstructiblePair<_U1, _U2>() && (! std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ImplicitlyMoveConvertiblePair<_U1, _U2>())), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(std::pair<_U1, _U2>&&)
  explicit constexpr pair(pair<_U1, _U2>&& __p)
                     ^~~~
/usr/include/c++/6/bits/stl_pair.h:351:21: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘std::pair<_T1, _T2>’ and ‘const char [9]’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:341:12: note: candidate: template<class _U1, class _U2, typename std::enable_if<(std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_MoveConstructiblePair<_U1, _U2>() && std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ImplicitlyMoveConvertiblePair<_U1, _U2>()), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(std::pair<_U1, _U2>&&)
  constexpr pair(pair<_U1, _U2>&& __p)
            ^~~~
/usr/include/c++/6/bits/stl_pair.h:341:12: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘std::pair<_T1, _T2>’ and ‘const char [9]’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:331:21: note: candidate: template<class _U1, class _U2, typename std::enable_if<(_MoveConstructiblePair<_U1, _U2>() && (! _ImplicitlyMoveConvertiblePair<_U1, _U2>())), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(_U1&&, _U2&&)
  explicit constexpr pair(_U1&& __x, _U2&& __y)
                     ^~~~
/usr/include/c++/6/bits/stl_pair.h:331:21: note:   template argument deduction/substitution failed:
/usr/include/c++/6/bits/stl_pair.h:330:38: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
                          bool>::type=false>
                                      ^~~~~
/usr/include/c++/6/bits/stl_pair.h:330:38: note: invalid template non-type parameter
/usr/include/c++/6/bits/stl_pair.h:322:12: note: candidate: template<class _U1, class _U2, typename std::enable_if<(_MoveConstructiblePair<_U1, _U2>() && _ImplicitlyMoveConvertiblePair<_U1, _U2>()), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(_U1&&, _U2&&)
  constexpr pair(_U1&& __x, _U2&& __y)
            ^~~~
/usr/include/c++/6/bits/stl_pair.h:322:12: note:   template argument deduction/substitution failed:
/usr/include/c++/6/bits/stl_pair.h:321:38: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
                          bool>::type=true>
                                      ^~~~
/usr/include/c++/6/bits/stl_pair.h:321:38: note: invalid template non-type parameter
/usr/include/c++/6/bits/stl_pair.h:313:17: note: candidate: template<class _U2, typename std::enable_if<_CopyMovePair<false, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, _U2>(), bool>::type <anonymous> > std::pair<_T1, _T2>::pair(const _T1&, _U2&&)
        explicit pair(const _T1& __x, _U2&& __y)
                 ^~~~
/usr/include/c++/6/bits/stl_pair.h:313:17: note:   template argument deduction/substitution failed:
/usr/include/c++/6/bits/stl_pair.h:312:38: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
                          bool>::type=false>
                                      ^~~~~
/usr/include/c++/6/bits/stl_pair.h:312:38: note: invalid template non-type parameter
/usr/include/c++/6/bits/stl_pair.h:306:18: note: candidate: template<class _U2, typename std::enable_if<_CopyMovePair<true, const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, _U2>(), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(const _T1&, _U2&&)
        constexpr pair(const _T1& __x, _U2&& __y)
                  ^~~~
/usr/include/c++/6/bits/stl_pair.h:306:18: note:   template argument deduction/substitution failed:
/usr/include/c++/6/bits/stl_pair.h:305:38: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
                          bool>::type=true>
                                      ^~~~
/usr/include/c++/6/bits/stl_pair.h:305:38: note: invalid template non-type parameter
/usr/include/c++/6/bits/stl_pair.h:299:27: note: candidate: template<class _U1, typename std::enable_if<_MoveCopyPair<false, _U1, std::function<Object*(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)> >(), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(_U1&&, const _T2&)
        explicit constexpr pair(_U1&& __x, const _T2& __y)
                           ^~~~
/usr/include/c++/6/bits/stl_pair.h:299:27: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   cannot convert ‘std::forward<Object* (stringtype::*)(std::__cxx11::basic_string<char>*)>((* & __args#1))’ (type ‘Object* (stringtype::*)(std::__cxx11::basic_string<char>*)’) to type ‘const std::function<Object*(std::__cxx11::basic_string<char>*)>&’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:292:18: note: candidate: template<class _U1, typename std::enable_if<_MoveCopyPair<true, _U1, std::function<Object*(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)> >(), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(_U1&&, const _T2&)
        constexpr pair(_U1&& __x, const _T2& __y)
                  ^~~~
/usr/include/c++/6/bits/stl_pair.h:292:18: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   cannot convert ‘std::forward<Object* (stringtype::*)(std::__cxx11::basic_string<char>*)>((* & __args#1))’ (type ‘Object* (stringtype::*)(std::__cxx11::basic_string<char>*)’) to type ‘const std::function<Object*(std::__cxx11::basic_string<char>*)>&’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:285:17: note: candidate: constexpr std::pair<_T1, _T2>::pair(std::pair<_T1, _T2>&&) [with _T1 = const std::__cxx11::basic_string<char>; _T2 = std::function<Object*(std::__cxx11::basic_string<char>*)>]
       constexpr pair(pair&&) = default;
                 ^~~~
/usr/include/c++/6/bits/stl_pair.h:285:17: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/6/bits/stl_pair.h:284:17: note: candidate: constexpr std::pair<_T1, _T2>::pair(const std::pair<_T1, _T2>&) [with _T1 = const std::__cxx11::basic_string<char>; _T2 = std::function<Object*(std::__cxx11::basic_string<char>*)>]
       constexpr pair(const pair&) = default;
                 ^~~~
/usr/include/c++/6/bits/stl_pair.h:284:17: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/6/bits/stl_pair.h:281:21: note: candidate: template<class _U1, class _U2, typename std::enable_if<(std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ConstructiblePair<_U1, _U2>() && (! std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ImplicitlyConvertiblePair<_U1, _U2>())), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(const std::pair<_U1, _U2>&)
  explicit constexpr pair(const pair<_U1, _U2>& __p)
                     ^~~~
/usr/include/c++/6/bits/stl_pair.h:281:21: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘const std::pair<_T1, _T2>’ and ‘const char [9]’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:272:19: note: candidate: template<class _U1, class _U2, typename std::enable_if<(std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ConstructiblePair<_U1, _U2>() && std::_PCC<((! std::is_same<const std::__cxx11::basic_string<char>, _U1>::value) || (! std::is_same<std::function<Object*(std::__cxx11::basic_string<char>*)>, _U2>::value)), const std::__cxx11::basic_string<char>, std::function<Object*(std::__cxx11::basic_string<char>*)> >::_ImplicitlyConvertiblePair<_U1, _U2>()), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(const std::pair<_U1, _U2>&)
         constexpr pair(const pair<_U1, _U2>& __p)
                   ^~~~
/usr/include/c++/6/bits/stl_pair.h:272:19: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   mismatched types ‘const std::pair<_T1, _T2>’ and ‘const char [9]’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:250:26: note: candidate: template<class _U1, class _U2, typename std::enable_if<(_ConstructiblePair<_U1, _U2>() && (! _ImplicitlyConvertiblePair<_U1, _U2>())), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(const _T1&, const _T2&)
       explicit constexpr pair(const _T1& __a, const _T2& __b)
                          ^~~~
/usr/include/c++/6/bits/stl_pair.h:250:26: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   cannot convert ‘std::forward<Object* (stringtype::*)(std::__cxx11::basic_string<char>*)>((* & __args#1))’ (type ‘Object* (stringtype::*)(std::__cxx11::basic_string<char>*)’) to type ‘const std::function<Object*(std::__cxx11::basic_string<char>*)>&’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:241:17: note: candidate: template<class _U1, class _U2, typename std::enable_if<(_ConstructiblePair<_U1, _U2>() && _ImplicitlyConvertiblePair<_U1, _U2>()), bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair(const _T1&, const _T2&)
       constexpr pair(const _T1& __a, const _T2& __b)
                 ^~~~
/usr/include/c++/6/bits/stl_pair.h:241:17: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   cannot convert ‘std::forward<Object* (stringtype::*)(std::__cxx11::basic_string<char>*)>((* & __args#1))’ (type ‘Object* (stringtype::*)(std::__cxx11::basic_string<char>*)’) to type ‘const std::function<Object*(std::__cxx11::basic_string<char>*)>&’
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:223:26: note: candidate: template<class _U1, class _U2, typename std::enable_if<std::__and_<std::is_default_constructible<_Tp>, std::is_default_constructible<_U2>, std::__not_<std::__and_<std::__is_implicitly_default_constructible<_U1>, std::__is_implicitly_default_constructible<_U2> > > >::value, bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair()
       explicit constexpr pair()
                          ^~~~
/usr/include/c++/6/bits/stl_pair.h:223:26: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   candidate expects 0 arguments, 2 provided
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:210:26: note: candidate: template<class _U1, class _U2, typename std::enable_if<std::__and_<std::__is_implicitly_default_constructible<_U1>, std::__is_implicitly_default_constructible<_U2> >::value, bool>::type <anonymous> > constexpr std::pair<_T1, _T2>::pair()
       _GLIBCXX_CONSTEXPR pair()
                          ^~~~
/usr/include/c++/6/bits/stl_pair.h:210:26: note:   template argument deduction/substitution failed:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
                 from /usr/include/c++/6/bits/allocator.h:46,
                 from /usr/include/c++/6/string:41,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/ext/new_allocator.h:120:4: note:   candidate expects 0 arguments, 2 provided
  { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard output is empty