Borderou de evaluare (job #327068)

Eroare de compilare: user.cpp: In member function ‘bool concurent::operator<(const concurent&) const’: user.cpp:12:16: error: expected primary-expression before ‘if’ user.cpp:12:16: error: expected ‘;’ before ‘if’ user.cpp: In function ‘int main()’: user.cpp:33:13: error: reference to ‘prev’ is ambiguous user.cpp:17:5: error: candidates are: int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp:40:13: error: reference to ‘prev’ is ambiguous user.cpp:17:5: error: candidates are: int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp: In member function ‘bool concurent::operator<(const concurent&) const’: user.cpp:13:5: warning: control reaches end of non-void function [-Wreturn-type]