模板类中的继承不起作用

Question

我有一个模板化的父类。

template <class T>
class Account
{
protected:
    T balance;
    int deposits;
    int withdrawals;
    T interestRate;
    T serviceCharges;
    bool status;
public:
...

有几个功能（一些是虚拟的，另一些则不是）。 然后我有一个继承的类（实际上是两个）下面是一个这样的类的例子。有一些错误即将出现，我似乎无法解决。

template <class T> 
class Checking : public Account <T>
{
public:
void withdraw(double amt)
{
    if (status == false)
    {
        cout << "Account is inactive.\n\n";
        return;
    }

    try
    {
        if (amt < 0)
        throw Account::NegativeAmount();

        else if (balance - amt < 25 && balance - amt > 0)
        {
            cout << "\nYour account has fallen below $25.00.\n";
            cout << "It will be deactivated.\n";
            status = false;
        }

        else if (balance - amt < 0)
        {
            cout << "You are attempting to withdraw more than the ";
            serviceCharges += 15.00;
            cout << "account balance.\n";
        }
        else
            Account::withdraw(amt);  // base class function call

        }
    catch (Account::NegativeAmount())
    {
        cout << "Withdraw positive numbers only.\n";
    }
}
};

我看到的另一个错误是此声明/代码行的错误：

code: throw Account::NegativeAmount();

error: 'template<class T> class Account' used without template parameters

如果我尝试通过添加

来修复它

code: throw Account<T>::NegativeAmount();

仍有错误且未修复。