Eroare de compilare: user.cpp:1:1: error: ‘include’ does not name a type include <fstream> ^ In file included from /usr/include/c++/5/bits/stl_algobase.h:62:0, from /usr/include/c++/5/vector:60, from user.cpp:2: /usr/include/c++/5/ext/type_traits.h:160:35: error: ‘__gnu_cxx::__is_null_pointer’ declared as an ‘inline’ variable __is_null_pointer(std::nullptr_t) ^ /usr/include/c++/5/ext/type_traits.h:160:35: error: ‘bool __gnu_cxx::__is_null_pointer’ redeclared as different kind of symbol /usr/include/c++/5/ext/type_traits.h:155:5: note: previous declaration ‘template<class _Type> bool __gnu_cxx::__is_null_pointer(_Type)’ __is_null_pointer(_Type) ^ /usr/include/c++/5/ext/type_traits.h:160:21: error: ‘nullptr_t’ is not a member of ‘std’ __is_null_pointer(std::nullptr_t) ^ In file included from /usr/include/c++/5/bits/move.h:57:0, from /usr/include/c++/5/bits/stl_pair.h:59, from /usr/include/c++/5/bits/stl_algobase.h:64, from /usr/include/c++/5/vector:60, from user.cpp:2: /usr/include/c++/5/type_traits:326:31: error: ‘std::size_t’ has not been declared template<typename _Tp, std::size_t _Size> ^ /usr/include/c++/5/type_traits:525:37: error: ‘nullptr_t’ is not a member of ‘std’ struct __is_null_pointer_helper<std::nullptr_t> ^ /usr/include/c++/5/type_traits:525:37: error: ‘nullptr_t’ is not a member of ‘std’ /usr/include/c++/5/type_traits:525:51: error: template argument 1 is invalid struct __is_null_pointer_helper<std::nullptr_t> ^ /usr/include/c++/5/type_traits:1411:32: error: ‘size_t’ is not a member of ‘std’ : public integral_constant<std::size_t, __alignof__(_Tp)> { }; ^ /usr/include/c++/5/type_traits:1411:32: error: ‘size_t’ is not a member of ‘std’ /usr/include/c++/5/type_traits:1411:61: error: template argument 1 is invalid : public integral_constant<std::size_t, __alignof__(_Tp)> { }; ^ /usr/include/c++/5/type_traits:1411:61: note: invalid template non-type parameter /usr/include/c++/5/type_traits:1416:32: error: ‘size_t’ is not a member of ‘std’ : public integral_constant<std::size_t, 0> { }; ^ /usr/include/c++/5/type_traits:1416:32: error: ‘size_t’ is not a member of ‘std’ /usr/include/c++/5/type_traits:1416:46: error: template argument 1 is invalid : public integral_constant<std::size_t, 0> { }; ^ /usr/include/c++/5/type_traits:1416:46: note: invalid template non-type parameter /usr/include/c++/5/type_traits:1418:31: error: ‘std::size_t’ has not been declared template<typename _Tp, std::size_t _Size> ^