Function isOperatorFunction

lib/checkunusedfunctions.cpp:301–346

static bool isOperatorFunction(const std::string & funcName)
{
    /* Operator functions are invalid function names for C, so no need to check
     * this in here. As result the returned error function might be incorrect.
     *
     * List of valid operators can be found at:
     * http://en.cppreference.com/w/cpp/language/operators
     *
     * Conversion functions must be a member function (at least for gcc), so no
     * need to cover them for unused functions.
     *
     * To speed up the comparison, not the whole list of operators is used.
     * Instead only the character after the operator prefix is checked to be a
     * none alpa numeric value, but the '_', to cover function names like
     * "operator_unused". In addition the following valid operators are checked:
     * - new
     * - new[]
     * - delete
     * - delete[]
     */
    const std::string operatorPrefix = "operator";
    if (funcName.compare(0, operatorPrefix.length(), operatorPrefix) != 0) {
        return false;
    }

    // Taking care of funcName == "operator", which is no valid operator
    if (funcName.length() == operatorPrefix.length()) {
        return false;
    }

    const char firstOperatorChar = funcName[operatorPrefix.length()];
    if (firstOperatorChar == '_') {
        return false;
    }

    if (!std::isalnum(firstOperatorChar)) {
        return true;
    }

    const std::vector<std::string> additionalOperators = {
        "new", "new[]", "delete", "delete[]"
    };


    return std::find(additionalOperators.cbegin(), additionalOperators.cend(), funcName.substr(operatorPrefix.length())) != additionalOperators.cend();
}

void CheckUnusedFunctions::staticFunctionError(ErrorLogger& errorLogger,
                                               const std::string &filename, nonneg int fileIndex, nonneg int lineNumber, nonneg int column,