Eroare de compilare: main.cpp:14:18: error: ISO C++ forbids declaration of 'interval' with no type [-fpermissive] bool comp(const& interval a, const& interval b) // operator < ^~~~~~~~ main.cpp:14:27: error: expected ',' or '...' before 'a' bool comp(const& interval a, const& interval b) // operator < ^ main.cpp: In function 'bool comp(const int&)': main.cpp:16:5: error: 'a' was not declared in this scope if(a.dr<b.dr) ^ main.cpp:16:10: error: 'b' was not declared in this scope if(a.dr<b.dr) ^ In file included from /usr/include/c++/6/bits/stl_algobase.h:71:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = interval*; _Iterator2 = interval*; _Compare = bool (*)(const int&)]': /usr/include/c++/6/bits/stl_algo.h:1844:14: required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1882:25: required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1968:31: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:4739:18: required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = interval*; _Compare = bool (*)(const int&)]' main.cpp:38:36: required from here /usr/include/c++/6/bits/predefined_ops.h:125:18: error: invalid initialization of reference of type 'const int&' from expression of type 'interval' { return bool(_M_comp(*__it1, *__it2)); } ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/6/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = interval*; _Value = interval; _Compare = bool (*)(const int&)]': /usr/include/c++/6/bits/stl_heap.h:129:48: required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = interval*; _Distance = long int; _Tp = interval; _Compare = __gnu_cxx::__ops::_Iter_comp_val<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_heap.h:230:23: required from 'void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = interval*; _Distance = long int; _Tp = interval; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_heap.h:335:22: required from 'void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1669:23: required from 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1930:25: required from 'void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1945:27: required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = interval*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:1965:25: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = interval*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&)>]' /usr/include/c++/6/bits/stl_algo.h:4739:18: required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = interval*; _Compare = bool (*)(const int&)]' main.cpp:38:36: required from here /usr/include/c++/6/bits/predefined_ops.h:147:11: error: invalid initialization of reference of type 'const int&' from expression of type 'interval' { return bool(_M_comp(*__it, __val)); } ^~~~~~~~~~~~~~~~~~~~~~~~~~~ Non zero exit status: 1