IPerson.h
1 #ifndef I_PERSON_H_ 2 #define I_PERSON_H_ 3 4 #include <string> 5 #include <ostream> 6 class IPerson 7 { 8 public: 9 virtual std::string GetName() const = 0; 10 virtual int GetAge() const = 0; 11 virtual std::string GetClassName() const = 0; 12 }; 13 14 std::ostream& operator<<(std::ostream &os, const IPerson &person); 15 16 #endif |
Person.h
1#ifndefPERSON_H_ 2#definePERSON_H_ 3 4#include"IPerson.h" 5 6classPerson:virtualpublicIPerson 7{ 8public: 9Person(conststd::string&name,constintage); 10virtual~Person(); 11std::stringGetName()constoverride; 12intGetAge()constoverride; 13std::stringGetClassName()constoverride; 14private: 15std::stringname; 16intage; 17}; 18 19#endif |
Person.cpp
1 #include "Person.h" 2 3 Person::Person(const std::string &name, const int age) : 4 name(name), 5 age(age) 6 { 7 } 8 9 Person::~Person() 10 { 11 } 12 13 std::string Person::GetName() const 14 { 15 return name; 16 } 17 18 int Person::GetAge() const 19 { 20 return age; 21 } 22 23 std::string Person::GetClassName() const 24 { 25 return std::string("Person"); 26 } 27 28 std::ostream& operator<<(std::ostream &os, const IPerson &person) 29 { 30 os << "Name: " << person.GetName() << ", " 31 << "Age: " << person.GetAge() << ", "; 32 33 return os; 34 } |
IStudent.h
1 #ifndef I_STUDENT_H_ 2 #define I_STUDENT_H_ 3 4 #include "IPerson.h" 5 7 8 class IStudent : virtual public IPerson 9 { 10 public: 11 virtual int GetGrade() const = 0; 12 }; 13 14 std::ostream& operator<<(std::ostream &os, const IStudent &student); 15 16 #endif |
Student.h
1 #ifndef STUDENT_H_ 2 #define STUDENT_H_ 3 4 #include "IStudent.h" 5 #include "Person.h" 6 7 class Student : virtual public IStudent, public Person 8 { 9 public: 10 Student(const std::string &name, const int age, const int grade); 11 ~Student(); 12 13 int GetGrade() const override; 14 std::string GetClassName() const override; 15 private: 16 int grade; 17 }; 18 19 #endif |
Student.cpp
1 #include "Student.h" 2 3 Student::Student(const std::string &name, const int age, const int grade) : 4 Person(name, age), 5 grade(grade) 6 { 7 } 8 9 Student::~Student() 10 { 11 } 12 13 int Student::GetGrade() const 14 { 15 return grade; 16 } 17 18 std::string Student::GetClassName() const 19 { 20 return std::string("Student"); 21 } 22 23 std::ostream& operator<<(std::ostream &os, const IStudent &student) 24 { 25 const IPerson &person = student; 26 os << person; 27 os << "Grade: " << student.GetGrade() << ", "; 28 29 return os; 30 } |
main.cpp
1 #include <iostream> 2 #include "Student.h" 3 4 using namespace std; 5 6 int main() 7 { 8 Student student(string("Leon"), 14, 8); 9 cout << "Student: " << student << endl; 10 11 IStudent &iStudent = student; 12 cout << "IStudent: " << iStudent << endl; 13 cout << "ClassName: " << iStudent.GetClassName() << endl; 14 15 IPerson &iPerson = student; 16 cout << "IPerson: " << iPerson << endl; 17 cout << "ClassName: " << iPerson.GetClassName() << endl; 18 19 cout << sizeof(IPerson) << endl; 20 cout << sizeof(Person) << endl; 21 cout << sizeof(IStudent) << endl; 22 cout << sizeof(Student) << endl; 23 24 return 0; 25 } |
测试结果
Student: Name: Leon, Age: 14, Grade: 8,
IStudent: Name: Leon, Age: 14, Grade: 8,
ClassName: Student
IPerson: Name: Leon, Age: 14,
ClassName: Student
4
48
12
64
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