Eroare de compilare: main.cpp:55:5: error: 'optional' does not name a type optional<T> data; ^~~~~~~~ main.cpp:76:5: error: 'optional' does not name a type optional<T> get(const string& s) { ^~~~~~~~ main.cpp: In member function 'void english_char_trie<T>::forEach(std::function<void(T)>)': main.cpp:87:13: error: 'data' was not declared in this scope if (data) fn(data.value()); ^~~~ main.cpp: In member function 'void hyper_english_char_trie::insert(const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:108:33: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? if (!root->children.get(hyper_char)) ^~~ main.cpp:111:35: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? root = root->children.get(hyper_char).value(); ^~~ main.cpp: In member function 'int hyper_english_char_trie::count_prefix(int, const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:121:36: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? if (root->children.get(hyper_char)) ^~~ main.cpp:122:43: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? ans -= root->children.get(hyper_char).value()->cnt; ^~~ main.cpp:125:33: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? if (!root->children.get(hyper_char)) ^~~ main.cpp:127:35: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'get'; did you mean 'set'? root = root->children.get(hyper_char).value(); ^~~ main.cpp: In instantiation of 'void english_char_trie<T>::set(const string&, const T&) [with T = hyper_english_char_trie*; std::__cxx11::string = std::__cxx11::basic_string<char>]': main.cpp:109:77: required from here main.cpp:73:15: error: 'struct english_char_trie<hyper_english_char_trie*>' has no member named 'data' root->data = value; ~~~~~~^~~~ Non zero exit status: 1