Compilare: user.cpp: In instantiation of ‘NodeTypeCatalog<counterType>::TrieNodeBasic* NodeTypeCatalog<counterType>::TrieNodeBasic::push(char) [with counterType = unsigned int]’: user.cpp:109:21: required from ‘void Trie<NodeType>::pushWord(const string&) [with NodeType = NodeTypeCatalog<unsigned int>::TrieNodeBasic; std::__cxx11::string = std::__cxx11::basic_string<char>]’ user.cpp:190:35: required from here user.cpp:32:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( this->child[cc] == 0 ) ~~~~~~~~~~~^ user.cpp:34:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] this->child[cc] = new TrieNodeBasic(); ~~~~~~~~~~~^ user.cpp:35:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] this->child[cc]->parent = this; ~~~~~~~~~~~^ user.cpp:37:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] this->child[cc]->prefixCount++; ~~~~~~~~~~~^ user.cpp:38:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] return this->child[cc]; ~~~~~~~~~~~^ user.cpp: In instantiation of ‘NodeTypeCatalog<counterType>::TrieNodeBasic* NodeTypeCatalog<counterType>::TrieNodeBasic::next(char) [with counterType = unsigned int]’: user.cpp:119:21: required from ‘void Trie<NodeType>::popWord(std::__cxx11::string) [with NodeType = NodeTypeCatalog<unsigned int>::TrieNodeBasic; std::__cxx11::string = std::__cxx11::basic_string<char>]’ user.cpp:193:34: required from here user.cpp:47:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( this->child[cc] == 0 ) ~~~~~~~~~~~^ user.cpp:50:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] return this->child[cc]; ~~~~~~~~~~~^