cpp/CPPlusV6/Chapter 13/acctabc.h

// acctabc.h  -- bank account classes
#ifndef ACCTABC_H_
#define ACCTABC_H_
#include <iostream>
#include <string>

// Abstract Base Class
class AcctABC
{
private:
    std::string fullName;
    long acctNum;
    double balance;
protected:
    struct Formatting 
    {
         std::ios_base::fmtflags flag;
         std::streamsize pr;
    };
    const std::string & FullName() const {return fullName;}
    long AcctNum() const {return acctNum;}
    Formatting SetFormat() const;
    void Restore(Formatting & f) const;
public: 
    AcctABC(const std::string & s = "Nullbody", long an = -1,
                double bal = 0.0);
    void Deposit(double amt) ;
    virtual void Withdraw(double amt) = 0; // pure virtual function
    double Balance() const {return balance;};
    virtual void ViewAcct() const = 0;     // pure virtual function
    virtual ~AcctABC() {}
};

// Brass Account Class
class Brass :public AcctABC
{
public:
    Brass(const std::string & s = "Nullbody", long an = -1,
           double bal = 0.0) : AcctABC(s, an, bal) { }
    virtual void Withdraw(double amt);
    virtual void ViewAcct() const;
    virtual ~Brass() {}
};

//Brass Plus Account Class
class BrassPlus : public AcctABC
{
private:
    double maxLoan;
    double rate;
    double owesBank;
public:
    BrassPlus(const std::string & s = "Nullbody", long an = -1,
            double bal = 0.0, double ml = 500,
            double r = 0.10);
    BrassPlus(const Brass & ba, double ml = 500, double r = 0.1);
    virtual void ViewAcct()const;
    virtual void Withdraw(double amt);
    void ResetMax(double m) { maxLoan = m; }
    void ResetRate(double r) { rate = r; };
    void ResetOwes() { owesBank = 0; }
};

#endif