Eroare de compilare: main.cpp: In function 'std::string eval(std::string)': main.cpp:106:28: error: no match for 'operator==' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'} and 'char') 106 | while (toks.back() == ')') | ~~~~~~~~~~~ ^~ ~~~ | | | | | char | __gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type {aka std::__cxx11::basic_string<char>} In file included from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/c++allocator.h:33, from /usr/include/c++/12.2.1/bits/allocator.h:46, from /usr/include/c++/12.2.1/string:41, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/fstream:38, from main.cpp:1: /usr/include/c++/12.2.1/bits/new_allocator.h:196:9: note: candidate: 'template<class _Up> constexpr bool std::operator==(const __new_allocator<char>&, const __new_allocator<_Tp>&)' (reversed) 196 | operator==(const __new_allocator&, const __new_allocator<_Up>&) | ^~~~~~~~ /usr/include/c++/12.2.1/bits/new_allocator.h:196:9: note: template argument deduction/substitution failed: main.cpp:106:31: note: '__gnu_cxx::__alloc_traits<std::allocator<std::__cxx11::basic_string<char> >, std::__cxx11::basic_string<char> >::value_type' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::__new_allocator<_Tp>' 106 | while (toks.back() == ')') | ^~~ /usr/include/c++/12.2.1/bits/allocator.h:219:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)' (reversed) 219 | operator==(const allocator<_T1>&, const allocator<_T2>&) | ^~~~~~~~ /usr/include/c++/12.2.1/bits/allocator.h:219:5: note: template argument deduction/substitution failed: main.cpp:106:31: note: mismatched types 'const std::allocator<_CharT>' and 'char' 106 | while (toks.back() == ')') | ^~~ In file included from /usr/include/c++/12.2.1/string:47: /usr/include/c++/12.2.1/bits/stl_iterator.h:530:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed) 530 | operator==(const reverse_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:530:5: note: template argument deduction/substitution failed: main.cpp:106:31: note: mismatched types 'const std::reverse_iterator<_IteratorL>' and 'char' 106 | while (toks.back() == ')') | ^~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:1656:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed) 1656 | operator==(const move_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:1656:5: note: template argument deduction/substitution failed: main.cpp:106:31: note: mismatched types 'const std::move_iterator<_IteratorL>' and 'char' 106 | while (toks.back() == ')') | ^~~ In file included from /usr/include/c++/12.2.1/bits/basic_string.h:47, from /usr/include/c++/12.2.1/string:53: /usr/include/c++/12.2.1/string_view:546:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)' (reversed) 546 | operator==(basic_string_view<_CharT, _Traits> __x, | ^~~~~~~~ Non zero exit status: 1