Compilare: main.cpp: In member function 'void trie::add(const char*)': main.cpp:18:52: warning: operation on 'letter' may be undefined [-Wsequence-point] for (char letter = *target; letter; letter = letter = *(char*)((intptr_t)&letter + 1)) { ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void trie::remove(const char*)': main.cpp:34:52: warning: operation on 'letter' may be undefined [-Wsequence-point] for (char letter = *target; letter; letter = letter = *(char*)((intptr_t)&letter + 1)) { ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int trie::get_occurences(const char*)': main.cpp:57:52: warning: operation on 'letter' may be undefined [-Wsequence-point] for (char letter = *target; letter; letter = letter = *(char*)((intptr_t)&letter + 1)) { ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int trie::get_closest_match_length(const char*)': main.cpp:70:52: warning: operation on 'letter' may be undefined [-Wsequence-point] for (char letter = *target; letter; letter = letter = *(char*)((intptr_t)&letter + 1)) { ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~