【发布时间】：2021-06-08 09:46:32
【问题描述】：
我最近做了一个包含 1 个超类和 2 个子类的应用程序。它的主要思想是将信息存储在3个不同的列表中。我的问题是，你可以只为所有 3 个类使用 1 个列表吗？即使 2 个子类有一些额外的成员。有人告诉我，您可以使用 unique_ptr 作为超类的成员并只列出 1 个列表。我在互联网上读过它，但我不太明白。有什么建议？感谢您的宝贵时间。
class Student {
std::string Name;
std::string Pinfo;
std::map < std::string, float > Ngradelist;
public:
std::string getName() {return Name;}
std::string getPinfo() {return Pinfo;}
virtual void InsertGradeList(std::string a, float b) {
for(auto& it : Ngradelist)
Ngradelist.insert(std::pair <std::string, float > (a,b));
}
Student( std::string n, std::string p, std::map < std::string, float > Ng) :
Name(std::move(n)), Pinfo(std::move(p)), Ngradelist(std::move(Ng)) {}
virtual void Display() {
std::cout << "Name: " << Name << std::endl;
std::cout << "Personal information: " << Pinfo << std::endl;
std::cout << "NCourse:" << std::endl;
for(auto& it : Ngradelist)
std::cout << " " << it.first << " Grade: " << it.second << std::endl;
}
};
class HWStudent : public Student {
std::string FieldOfWork;
std::map<std::string, float> HWgradelist;
public:
void InsertGradeList(std::string a, float b) override{
for (auto &it : HWgradelist)
HWgradelist.insert(std::pair<std::string, float>(a, b));
}
HWStudent(std::string n, std::string p, std::map<std::string, float> Ng, std::string f,
std::map<std::string, float> HWg) : Student(std::move(n), std::move(p), std::move(Ng)),
FieldOfWork(std::move(f)), HWgradelist(std::move(HWg)) {}
void Display() override {
Student::Display();
std::cout << "Field of Work: " << FieldOfWork << std::endl;
std::cout << "HWCourse:" << std::endl;
for(const auto& it : HWgradelist)
std::cout << " " << it.first << " Grade: " << it.second << std::endl;
}
};
class SWStudent : public Student {
std::map<std::string, float> SWgradelist;
std::list < std::string > Languages;
public:
void InsertGradeList(std::string a, float b) override {
for (const auto &it : SWgradelist)
SWgradelist.insert(std::pair<std::string, float>(a, b));
}
SWStudent(std::string n, std::string p, std::map<std::string, float> Ng, std::list < std::string > l,
std::map<std::string, float> SWg) : Student(std::move(n), std::move(p), std::move(Ng)),
Languages(std::move(l)), SWgradelist(std::move(SWg)) {}
void Display() override {
Student::Display();
std::cout << "SWCourse:" << std::endl;
for(const auto& it : SWgradelist)
std::cout << " " << it.first << " Grade: " << it.second << std::endl;
std::cout << "SW Languages:" << std::endl;
for(const auto& it : Languages)
std::cout << " " << it << std::endl;
}
};
std::list < Student > listaStudenti;
std::list < HWStudent > HWlistaStudenti;
std::list < SWStudent > SWlistaStudenti;
void InsertListaStudenti(unsigned short option) {
unsigned short numbers;
std::string name , pinfo, course, fieldofwork, hwcourse, swcourse;
std::string language;
float grade = 0, hwgrade, swgrade;
std::list < std::string > languagelist;
if(option == 1) {
std::cout << "Insert name: ";
std::cin >> name;
std::cout << "Insert personal information: ";
std::cin >> pinfo;
std::cout << "Insert course: ";
std::cin >> course;
std::cout << "Insert grade: ";
std::cin >> grade;
Student student(name, pinfo, {{course, grade}});
listaStudenti.push_back(student);
}
if(option == 2) {
std::cout << "Insert name: ";
std::cin >> name;
std::cout << "Insert personal information: ";
std::cin >> pinfo;
std::cout << "Insert course: ";
std::cin >> course;
std::cout << "Insert grade: ";
std::cin >> grade;
std::cout << "Insert hwcourse: ";
std::cin >> hwcourse;
std::cout << "Insert hwgrade: ";
std::cin >> hwgrade;
std::cout << "Insert fieldofwork: ";
std::cin >> fieldofwork;
HWStudent hwstudent(name, pinfo, {{course, grade}}, fieldofwork,{{hwcourse, hwgrade}});
HWlistaStudenti.push_back(hwstudent);
}
if(option == 3) {
std::cout << "Insert name: ";
std::cin >> name;
std::cout << "Insert personal information: ";
std::cin >> pinfo;
std::cout << "Insert course: ";
std::cin >> course;
std::cout << "Insert grade: ";
std::cin >> grade;
std::cout << "Insert swcourse: ";
std::cin >> swcourse;
std::cout << "Insert swgrade: ";
std::cin >> swgrade;
std::cout << "How many languages: ";
std::cin >> numbers;
for(auto it = 0;it < numbers; ++it) {
std::cout << "Insert language: ";
std::cin >> language;
languagelist.push_back(language);
}
SWStudent swstudent(name, pinfo, {{course, grade}},languagelist,{{swcourse, swgrade}});
SWlistaStudenti.push_back(swstudent);
}
}
int main() {
unsigned short option = 10;
while(option != 0) {
std::cout << "1.Add student." << std::endl;
std::cout << "2.Add HW student." << std::endl;
std::cout << "3.Add SW student." << std::endl;
std::cout << "4.Display Student." << std::endl;
std::cout << "5.Display HW Student." << std::endl;
std::cout << "6.Display SW Student." << std::endl;
std::cout << "0 is for exit." << std::endl;
std::cout << "Option is : ";
std::cin >> option;
switch (option) {
case 0 : {
std::cout <<" You chose to leave.";
exit;
break;
}
case 1 : {
InsertListaStudenti(option);
break;
}
case 2 : {
InsertListaStudenti(option);
break;
}
case 3: {
InsertListaStudenti(option);
break;
}
case 4: {
for(auto &it : listaStudenti)
it.Display();
break;
}
case 5: {
for(auto &it : HWlistaStudenti)
it.Display();
break;
}
case 6: {
for(auto &it : SWlistaStudenti)
it.Display();
break;
}
}
}
}
【问题讨论】：
标签： c++ list oop c++11 unique-ptr