In file included from /usr/include/c++/8/algorithm:62,
from prog.cpp:2:
/usr/include/c++/8/bits/stl_algo.h: In instantiation of ‘void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = std::_List_iterator<int>; _Compare = __gnu_cxx::__ops::_Iter_less_iter]’:
/usr/include/c++/8/bits/stl_algo.h:4834:18: required from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = std::_List_iterator<int>]’
prog.cpp:7:37: required from here
/usr/include/c++/8/bits/stl_algo.h:1969:22: error: no match for ‘operator-’ (operand types are ‘std::_List_iterator<int>’ and ‘std::_List_iterator<int>’)
std::__lg(__last - __first) * 2,
~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/8/bits/stl_algobase.h:67,
from /usr/include/c++/8/list:60,
from prog.cpp:1:
/usr/include/c++/8/bits/stl_iterator.h:392:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)’
operator-(const reverse_iterator<_IteratorL>& __x,
^~~~~~~~
/usr/include/c++/8/bits/stl_iterator.h:392:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/8/algorithm:62,
from prog.cpp:2:
/usr/include/c++/8/bits/stl_algo.h:1969:22: note: ‘std::_List_iterator<int>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
std::__lg(__last - __first) * 2,
~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/8/bits/stl_algobase.h:67,
from /usr/include/c++/8/list:60,
from prog.cpp:1:
/usr/include/c++/8/bits/stl_iterator.h:1188:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)’
operator-(const move_iterator<_IteratorL>& __x,
^~~~~~~~
/usr/include/c++/8/bits/stl_iterator.h:1188:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/8/algorithm:62,
from prog.cpp:2:
/usr/include/c++/8/bits/stl_algo.h:1969:22: note: ‘std::_List_iterator<int>’ is not derived from ‘const std::move_iterator<_IteratorL>’
std::__lg(__last - __first) * 2,
~~~~~~~^~~~~~~~~