Virtual Template

#include<iostream>
using namespace std;

class currentAcc {};

class savingAcc {
	public:
		virtual void display(string,float) {}
};

template <class vAcc>
class account : private vAcc {
	public:

		/* Virtuality of display() depends on its declaration in the base class 'vAcc' */
		void display(string name, float bal) {
			cout << "Account Holder Name: " << name << endl;
			cout << "Balance: " << bal << endl;
		}
};

template <class saving>
class interestAcc : public account<saving> {
	public:
		void display(string name, float bal) {

			/* Calculate 9% interest */
			int interest = bal * .09;
			cout << "Account Holder Name: " << name << endl;
			cout << "Interest: " << interest << endl;
			cout << "Balance: " << bal+interest << endl;
		}
};

int main() {
	account<currentAcc> *acc1 = new interestAcc<currentAcc>;

	/* Call display() from account */
	acc1->display("Jonh", 5230.65);
	cout << "\n<---------------------------------------------->\n" << endl;
	account<savingAcc> *acc2 = new interestAcc<savingAcc>;

	/* Call display() from 'interestAcc' */
	acc2->display("Ashok", 1550.55);
}



/* Output */
Account Holder Name: Jonh
Balance: 5230.65


<---------------------------------------------->


Account Holder Name: Ashok
Interest: 139
Balance: 1689.55