hash operator T operator!= operator== symbol symbol

operator== bool operator== ( const symbol & lhs, const symbol & rhs ) friend Determines if two symbols are equal. Parameters lhs,rhs The symbols to compare. Return values true The underlying strings of lhs and rhs are equal. false The underlying strings of lhs and rhs are not equal. Postcondition x == y if and only if (const std::string &)x == (const std::string &)y