bool criterion3 (vector w) { if (w.empty()) return false;

int i = 0; // first characters int j = w.size() - 1; // last character

while (i < j) { if (w[i]!=w[j]) { return false; } i++; j--; } return true; }

I created a class (Word) and we were asked to implement it using this bool criterion3 (vector w) to search for words in a file and check if its palindrome or not but it's giving me this Error. [Error] no match for 'operator!=' (operand types are 'Word' and 'Word'), [Note] template argument deduction/substitution failed, [Note] 'Word' is not derived from 'const std::pair<_T1, _T2>'. Please Help.