代码的重用，私有继承，多重继承

C++ 私有继承 多重继承

workermi.h

#ifndef PRO1_WORKERMI_H
#define PRO1_WORKERMI_H
#include <string>
using namespace std;
class Worker {
private:
    string fullname;
    long id;
protected:
    virtual void Data()const ;
    virtual void Get();
public:
    Worker():fullname("no one"), id(0L){}
    Worker(const string & s, long n) :fullname(s), id(n){}
    virtual ~Worker();
    virtual void Set()=0;
    virtual void Show()const = 0;
};
class Waiter:virtual public Worker{
private:
    int panache;
protected:
    void Data()const ;
    void Get();
public:
    Waiter():Worker(), panache(0){}
    Waiter(const string & s, long n, int p = 0):Worker(s, n), panache(p){}
    Waiter(const Worker & wk, int p = 0):Worker(wk), panache(p){}
    void Set();
    void Show()const ;
};
class Singer: virtual public Worker{
protected:
    enum {other, alto, contralto, soprano, bass, baritone, tenor};
    enum {Vtypes = 7};
    void Data()const ;
    void Get();
private:
    static char *pv[Vtypes];
    int voice;
public:
    Singer():Worker(), voice(other){}
    Singer(const string & s, long n, int v = other):Worker(s, n), voice(v){}
    Singer(const Worker & wk, int v = other): Worker(wk), voice(v){}
    void Set();
    void Show()const ;
};
// 多重继承
class SingingWaiter:public Singer,public Waiter{
protected:
    void Data()const ;
    void Get();
public:
    SingingWaiter(){}
    SingingWaiter(const string & s, long n, int p = 0, int v = other)
    :Worker(s, n), Waiter(s, n, p), Singer(s, n, v){}
    SingingWaiter(const Worker & wk, int p = 0, int v = other)
    :Worker(wk), Waiter(wk, p), Singer(wk, v){}
    SingingWaiter(const Waiter &wt, int v = other)
    :Worker(wt), Waiter(wt), Singer(wt, v){}
    SingingWaiter(const Singer & wt, int p = 0)
    :Worker(wt), Waiter(wt, p), Singer(wt){}
    void Set();
    void Show()const ;
};
#endif //PRO1_WORKERMI_H

workermi.cpp

#include "workermi.h"
#include <iostream>
using namespace std;
Worker::~Worker() {}
void Worker::Data() const {
    cout << "Name: " << fullname << endl;
    cout << "Employee ID: " << id << endl;
}
void Worker::Get() {
    getline(cin, fullname);
    cout << "Enter worker's ID: ";
    cin >> id;
    while (cin.get()!='\n')
        continue;
}
void Waiter::Set() {
    cout << "Enter waiter's name: ";
    Worker::Get();
    Get();
}
void Waiter::Show() const {
    cout << "Category: waiter\n";
    Worker::Data();
    Data();
}
void Waiter::Data() const {
    cout << "Panache rating: " << panache << endl;
}
void Waiter::Get() {
    cout << "Enter waiter's panache rating: ";
    cin >> panache;
    while (cin.get()!='\n')
        continue;
}
char * Singer::pv[Singer::Vtypes] = {"other", "alto", "contralto", "soprano", "bass", "baritone", "tenor"};
void Singer::Set() {
    cout << "Enter singer's name: ";
    Worker::Get();
    Get();
}
void Singer::Show() const {
    cout << "Category : singer \n";
    Worker::Data();
    Data();
}
void Singer::Data() const {
    cout << "Vocal range: " << pv[voice] << endl;
}
void Singer::Get() {
    cout << "Enter number for singer's vocal range:\n";
    int i;
    for(i = 0; i < Vtypes; i++){
        cout << i << " : " << pv[i] << "   ";
        if (i % 4 == 3) {
            cout << endl;
        }
    }
    if (i % 4 != 0) {
        cout << endl;
    }
    cin >> voice;
    while (cin.get() != '\n') {
        continue;
    }
}
void SingingWaiter::Data() const {
    Singer::Data();
    Waiter::Data();
}
void SingingWaiter::Get() {
    Waiter::Get();
    Singer::Get();
}
void SingingWaiter::Set() {
    cout << "Enter singing waiter's name: ";
    Worker::Get();
    Get();
}
void SingingWaiter::Show() const {
    cout << "Category : singing waiter\n";
    Worker::Data();
    Data();
}

main.cpp

#include <iostream>
#include <cstring>
#include "module10_code_reuse/workermi.h"
using namespace std;
// 代码的重用，私有继承，多重继承
const int SIZE_M = 5;
void workmi(){
    Worker * lolas[SIZE_M];
    int ct;
    for (ct = 0; ct < SIZE_M; ct++) {
        char choise;
        cout << "Enter the employee category:\n"
        << "w: waiter s: singer t: singing waiter q: quit\n";
        cin >> choise;
        while (strchr("wstq", choise) == NULL) {
            cout << "Please enter a w, s, t, or q: ";
            cin >> choise;
        }
        if (choise == 'q')
            break;
        switch (choise) {
            case 'w': lolas[ct] = new Waiter;
                break;
            case 's': lolas[ct] = new Singer;
                break;
            case 't': lolas[ct] = new SingingWaiter;
                break;
        }
        cin.get();
        lolas[ct]->Set();
    }
    cout << "\nHere is your sraff:\n";
    int i;
    for (i = 0; i < ct; i++) {
        cout << endl;
        lolas[i]->Show();
    }
    for  (i = 0; i < ct; i++)
        delete lolas[i];
    cout << "Bye.\n";
}
int main() {
    workmi();
    return 0;
}