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#include <iostream>
#include <memory>
#include <set>
using namespace std;
 
int main() {
	            std::shared_ptr< int > p(new int());
            *p=5;
            auto setWeakPtrForint=std::set<std::weak_ptr<int> >();
            std::weak_ptr<int> weakPtrForint(p);
            setWeakPtrForint.insert(weakPtrForint);
	return 0;
}

In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h: In instantiation of ‘bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = std::weak_ptr<int>]’:
/usr/include/c++/4.8/bits/stl_tree.h:1324:11:   required from ‘std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = std::weak_ptr<int>; _Val = std::weak_ptr<int>; _KeyOfValue = std::_Identity<std::weak_ptr<int> >; _Compare = std::less<std::weak_ptr<int> >; _Alloc = std::allocator<std::weak_ptr<int> >; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::key_type = std::weak_ptr<int>]’
/usr/include/c++/4.8/bits/stl_tree.h:1377:47:   required from ‘std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = const std::weak_ptr<int>&; _Key = std::weak_ptr<int>; _Val = std::weak_ptr<int>; _KeyOfValue = std::_Identity<std::weak_ptr<int> >; _Compare = std::less<std::weak_ptr<int> >; _Alloc = std::allocator<std::weak_ptr<int> >]’
/usr/include/c++/4.8/bits/stl_set.h:463:29:   required from ‘std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename _Alloc::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::weak_ptr<int>; _Compare = std::less<std::weak_ptr<int> >; _Alloc = std::allocator<std::weak_ptr<int> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename _Alloc::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<std::weak_ptr<int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::weak_ptr<int>]’
prog.cpp:11:50:   required from here
/usr/include/c++/4.8/bits/stl_function.h:235:20: error: no match for ‘operator<’ (operand types are ‘const std::weak_ptr<int>’ and ‘const std::weak_ptr<int>’)
       { return __x < __y; }
                    ^
/usr/include/c++/4.8/bits/stl_function.h:235:20: note: candidates are:
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_pair.h:220:5: note: template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/4.8/bits/stl_pair.h:220:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::pair<_T1, _T2>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:297:5: note: template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator<(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:297:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:347:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator<(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:347:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1055:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator<(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1055:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::move_iterator<_Iterator>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1061:5: note: template<class _Iterator> bool std::operator<(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator<(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1061:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::move_iterator<_Iterator>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2569:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2569:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2581:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2581:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2593:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<(const _CharT* __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2593:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   mismatched types ‘const _CharT*’ and ‘std::weak_ptr<int>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/tuple:39:0,
                 from /usr/include/c++/4.8/functional:55,
                 from /usr/include/c++/4.8/memory:79,
                 from prog.cpp:2:
/usr/include/c++/4.8/array:238:5: note: template<class _Tp, unsigned int _Nm> bool std::operator<(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
     ^
/usr/include/c++/4.8/array:238:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::array<_Tp, _Nm>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/functional:55:0,
                 from /usr/include/c++/4.8/memory:79,
                 from prog.cpp:2:
/usr/include/c++/4.8/tuple:822:5: note: template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
     operator<(const tuple<_TElements...>& __t,
     ^
/usr/include/c++/4.8/tuple:822:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::tuple<_Elements ...>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/unique_ptr.h:523:5: note: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator<(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator<(const unique_ptr<_Tp, _Dp>& __x,
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:523:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/unique_ptr.h:534:5: note: template<class _Tp, class _Dp> bool std::operator<(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:534:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/unique_ptr.h:540:5: note: template<class _Tp, class _Dp> bool std::operator<(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:540:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   cannot convert ‘__x’ (type ‘const std::weak_ptr<int>’) to type ‘std::nullptr_t’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1090:5: note: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator<(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator<(const __shared_ptr<_Tp1, _Lp>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1090:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::__shared_ptr<_Tp1, _Lp>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1099:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator<(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator<(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1099:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::__shared_ptr<_Tp, _Lp>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1104:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator<(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator<(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1104:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   cannot convert ‘__x’ (type ‘const std::weak_ptr<int>’) to type ‘std::nullptr_t’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr.h:359:5: note: template<class _Tp1, class _Tp2> bool std::operator<(const std::shared_ptr<_Tp1>&, const std::shared_ptr<_Tp2>&)
     operator<(const shared_ptr<_Tp1>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:359:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::shared_ptr<_Tp1>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr.h:368:5: note: template<class _Tp> bool std::operator<(const std::shared_ptr<_Tp1>&, std::nullptr_t)
     operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:368:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::shared_ptr<_Tp1>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr.h:373:5: note: template<class _Tp> bool std::operator<(std::nullptr_t, const std::shared_ptr<_Tp1>&)
     operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:373:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   cannot convert ‘__x’ (type ‘const std::weak_ptr<int>’) to type ‘std::nullptr_t’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/set:60:0,
                 from prog.cpp:3:
/usr/include/c++/4.8/bits/stl_tree.h:917:5: note: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator<(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator<(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_tree.h:917:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/set:61:0,
                 from prog.cpp:3:
/usr/include/c++/4.8/bits/stl_set.h:771:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator<(const std::set<_Key, _Compare, _Alloc>&, const std::set<_Key, _Compare, _Alloc>&)
     operator<(const set<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_set.h:771:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::set<_Key, _Compare, _Alloc>’
       { return __x < __y; }
                    ^
In file included from /usr/include/c++/4.8/set:62:0,
                 from prog.cpp:3:
/usr/include/c++/4.8/bits/stl_multiset.h:756:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator<(const std::multiset<_Key, _Compare, _Alloc>&, const std::multiset<_Key, _Compare, _Alloc>&)
     operator<(const multiset<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_multiset.h:756:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/string:48:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_function.h:235:20: note:   ‘const std::weak_ptr<int>’ is not derived from ‘const std::multiset<_Key, _Compare, _Alloc>’
       { return __x < __y; }
                    ^

Standard output is empty